Hi guys,

after upgrading ACS from 4.1.1 to 4.3.1 and upgrading XS 6.0.2 to latest 
hotfixes and manually replacing NFSSR.py with one from ACS 4.3.1, amongst other 
errors, I see this error.
Snapshot is created successfully. I have created templates from it and used 
them to create new VMs, but in the log there is an error. (Also snapshots are 
not working on volumes which have had snapshots before the upgrade. But i will 
deal with that issue later. They might even be related.)

What should I check to provide you with more info about the issue, so we can 
address it?
Google search came up empty for this issue. :-( Please help me sort this out.
To me, it looks like Xen removed 
/dev/VG_XenStorage-197c3580-fc82-35e5-356d-1f0909a9cfd9/VHD-3d732e11-8697-4a45-9518-44d4154ee6d6
 after the copy to secondary storage but before cloudstack ordered the removal.
Should I open a bug for it?


This is where i believe the snapshot was ordered:
/////////////////////////////////////
2014-10-07 16:51:16,919 DEBUG [o.a.c.f.j.i.AsyncJobManagerImpl] 
(http-6443-exec-42:ctx-6a64da65 ctx-e324e472) submit async job-2171, details: 
AsyncJobVO {id:2171, userId: 28, accountId: 30, instanceType: Snapshot, 
instanceId: 977, cmd: 
org.apache.cloudstack.api.command.user.snapshot.CreateSnapshotCmd, cmdInfo: 
{"id":"977","response":"json","sessionkey”:"XXXXX","cmdEventType":"SNAPSHOT.CREATE","ctxUserId":"28","httpmethod":"GET","_":"1412693528063","volumeid":"72d5b956-fbaf-44c2-8aeb-df49354ddbb3","quiescevm":"false","ctxAccountId":"30","ctxStartEventId":"60842"},
 cmdVersion: 0, status: IN_PROGRESS, processStatus: 0, resultCode: 0, result: 
null, initMsid: 95545481387, completeMsid: null, lastUpdated: null, lastPolled: 
null, created: null}
2014-10-07 16:51:16,920 INFO  [o.a.c.f.j.i.AsyncJobMonitor] 
(Job-Executor-84:ctx-649dbc0e) Add job-2171 into job monitoring
2014-10-07 16:51:16,920 DEBUG [o.a.c.f.j.i.AsyncJobManagerImpl] 
(Job-Executor-84:ctx-649dbc0e) Executing AsyncJobVO {id:2171, userId: 28, 
accountId: 30, instanceType: Snapshot, instanceId: 977, cmd: 
org.apache.cloudstack.api.command.user.snapshot.CreateSnapshotCmd, cmdInfo: 
{"id":"977","response":"json","sessionkey”:"XXXXX","cmdEventType":"SNAPSHOT.CREATE","ctxUserId":"28","httpmethod":"GET","_":"1412693528063","volumeid":"72d5b956-fbaf-44c2-8aeb-df49354ddbb3","quiescevm":"false","ctxAccountId":"30","ctxStartEventId":"60842"},
 cmdVersion: 0, status: IN_PROGRESS, processStatus: 0, resultCode: 0, result: 
null, initMsid: 95545481387, completeMsid: null, lastUpdated: null, lastPolled: 
null, created: null}
2014-10-07 16:51:16,920 DEBUG [c.c.a.ApiServlet] 
(http-6443-exec-42:ctx-6a64da65 ctx-e324e472) ===END===  XX.XX.XX.XX -- GET  
command=createSnapshot&volumeid=72d5b956-fbaf-44c2-8aeb-df49354ddbb3&quiescevm=false&response=json&sessionkey=XXXXXX%3D&_=1412693528063
2014-10-07 16:51:16,928 DEBUG [c.c.u.AccountManagerImpl] 
(Job-Executor-84:ctx-649dbc0e ctx-e324e472) Access to 
Acct[7ff6cd6b-7400-4d44-980b-9dc3115264eb-XXXXXX] granted to 
Acct[7ff6cd6b-7400-4d44-980b-9dc3115264eb-XXXX] by DomainChecker
2014-10-07 16:51:16,953 INFO  [o.a.c.a.c.u.s.CreateSnapshotCmd] 
(Job-Executor-84:ctx-649dbc0e ctx-e324e472) VOLSS: createSnapshotCmd 
starts:1412693476953
2014-10-07 16:51:17,290 DEBUG [c.c.a.t.Request] (Job-Executor-84:ctx-649dbc0e 
ctx-e324e472) Seq 2-1824254062: Sending  { Cmd , MgmtId: 95545481387, via: 
2(x2.XXX), Ver: v1, Flags: 100011, 
[{"org.apache.cloudstack.storage.command.CreateObjectCommand":{"data":{"org.apache.cloudstack.storage.to.SnapshotObjectTO":{"volume":{"uuid":"72d5b956-fbaf-44c2-8aeb-df49354ddbb3","volumeType":"ROOT","dataStore":{"org.apache.cloudstack.storage.to.PrimaryDataStoreTO":{"uuid":"1c8dbf77-2b23-3244-91ee-5037cb2a55a8","id":208,"poolType":"IscsiLUN","host":"s2.v.XXX","path":"/iqn.2010-02.XXX:storage.XXX.s2/1","port":3260,"url":"IscsiLUN://s2.v.XXX//iqn.2010-02.XXX:storage.XXX.s2/1/?ROLE=Primary&STOREUUID=1c8dbf77-2b23-3244-91ee-5037cb2a55a8"}},"name":"ROOT-457","size":21474836480,"path":"5f54e049-7336-46bf-88be-c364624504f9","volumeId":556,"vmName":"i-30-457-VM","accountId":30,"format":"VHD","id":556,"deviceId":0,"hypervisorType":"XenServer"},"dataStore":{"org.apache.cloudstack.storage.to.PrimaryDataStoreTO":{"uuid":"1c8dbf77-2b23-3244-91ee-5037cb2a55a8","id":208,"poolType":"IscsiLUN","host":"s2.v.XXX","path":"/iqn.2010-02.XXX:storage.XXX.s2/1","port":3260,"url":"IscsiLUN://s2.v.XXX//iqn.2010-02.XXX:storage.XXX.s2/1/?ROLE=Primary&STOREUUID=1c8dbf77-2b23-3244-91ee-5037cb2a55a8"}},"vmName":"i-30-457-VM","name":"MInecraftDebian_ROOT-457_20141007145115","hypervisorType":"XenServer","id":977,"quiescevm":false,"physicalSize":0}},"wait":0}}]
 }
2014-10-07 16:51:17,291 DEBUG [c.c.a.t.Request] (Job-Executor-84:ctx-649dbc0e 
ctx-e324e472) Seq 2-1824254062: Executing:  { Cmd , MgmtId: 95545481387, via: 
2(x2.XXX), Ver: v1, Flags: 100011, 
[{"org.apache.cloudstack.storage.command.CreateObjectCommand":{"data":{"org.apache.cloudstack.storage.to.SnapshotObjectTO":{"volume":{"uuid":"72d5b956-fbaf-44c2-8aeb-df49354ddbb3","volumeType":"ROOT","dataStore":{"org.apache.cloudstack.storage.to.PrimaryDataStoreTO":{"uuid":"1c8dbf77-2b23-3244-91ee-5037cb2a55a8","id":208,"poolType":"IscsiLUN","host":"s2.v.XXX","path":"/iqn.2010-02.XXX:storage.XXX.s2/1","port":3260,"url":"IscsiLUN://s2.v.XXX//iqn.2010-02.XXX:storage.XXX.s2/1/?ROLE=Primary&STOREUUID=1c8dbf77-2b23-3244-91ee-5037cb2a55a8"}},"name":"ROOT-457","size":21474836480,"path":"5f54e049-7336-46bf-88be-c364624504f9","volumeId":556,"vmName":"i-30-457-VM","accountId":30,"format":"VHD","id":556,"deviceId":0,"hypervisorType":"XenServer"},"dataStore":{"org.apache.cloudstack.storage.to.PrimaryDataStoreTO":{"uuid":"1c8dbf77-2b23-3244-91ee-5037cb2a55a8","id":208,"poolType":"IscsiLUN","host":"s2.v.XXX","path":"/iqn.2010-02.XXX:storage.XXX.s2/1","port":3260,"url":"IscsiLUN://s2.v.XXX//iqn.2010-02.XXX:storage.XXX.s2/1/?ROLE=Primary&STOREUUID=1c8dbf77-2b23-3244-91ee-5037cb2a55a8"}},"vmName":"i-30-457-VM","name":"MInecraftDebian_ROOT-457_20141007145115","hypervisorType":"XenServer","id":977,"quiescevm":false,"physicalSize":0}},"wait":0}}]
 }
2014-10-07 16:51:17,291 DEBUG [c.c.a.m.DirectAgentAttache] 
(DirectAgent-25:ctx-a5197893) Seq 2-1824254062: Executing request
2014-10-07 16:51:18,352 DEBUG [c.c.a.m.AgentManagerImpl] 
(AgentManager-Handler-7:null) Ping from 21
2014-10-07 16:51:20,075 DEBUG [c.c.a.ApiServlet] 
(http-6443-exec-34:ctx-c9163aa8) ===START===  XX.XX.XX.XX -- GET  
command=queryAsyncJobResult&jobId=89c49a6f-9d61-4bd8-a9ee-c41390ea3747&response=json&sessionkey=XXXXX%3D&_=1412693532730
2014-10-07 16:51:20,165 DEBUG [c.c.a.ApiServlet] 
(http-6443-exec-34:ctx-c9163aa8 ctx-25e4cfa1) ===END===  XX.XX.XX.XX -- GET  
command=queryAsyncJobResult&jobId=89c49a6f-9d61-4bd8-a9ee-c41390ea3747&response=json&sessionkey=XXXXXX%3D&_=1412693532730
2014-10-07 16:51:20,238 DEBUG [c.c.a.m.AgentManagerImpl] 
(AgentManager-Handler-12:null) SeqA 27-139339: Processing Seq 27-139339:  { Cmd 
, MgmtId: -1, via: 27, Ver: v1, Flags: 11, 
[{"com.cloud.agent.api.ConsoleProxyLoadReportCommand":{"_proxyVmId":473,"_loadInfo":"{\n
  \"connections\": []\n}","wait":0}}] }
2014-10-07 16:51:20,281 DEBUG [c.c.a.m.AgentManagerImpl] 
(AgentManager-Handler-12:null) SeqA 27-139339: Sending Seq 27-139339:  { Ans: , 
MgmtId: 95545481387, via: 27, Ver: v1, Flags: 100010, 
[{"com.cloud.agent.api.AgentControlAnswer":{"result":true,"wait":0}}] }
2014-10-07 16:51:21,767 DEBUG [c.c.a.m.DirectAgentAttache] 
(DirectAgent-25:ctx-a5197893) Seq 2-1824254062: Response Received: 
2014-10-07 16:51:21,767 DEBUG [c.c.a.t.Request] (DirectAgent-25:ctx-a5197893) 
Seq 2-1824254062: Processing:  { Ans: , MgmtId: 95545481387, via: 2, Ver: v1, 
Flags: 10, 
[{"org.apache.cloudstack.storage.command.CreateObjectAnswer":{"data":{"org.apache.cloudstack.storage.to.SnapshotObjectTO":{"path":"d38b38f3-ebda-4cf7-9701-4ba22409644c","id":0,"quiescevm":false,"physicalSize":0}},"result":true,"wait":0}}]
 }
2014-10-07 16:51:21,768 DEBUG [c.c.a.t.Request] (Job-Executor-84:ctx-649dbc0e 
ctx-e324e472) Seq 2-1824254062: Received:  { Ans: , MgmtId: 95545481387, via: 
2, Ver: v1, Flags: 10, { CreateObjectAnswer } }
2014-10-07 16:51:22,156 DEBUG [o.a.c.s.m.AncientDataMotionStrategy] 
(Job-Executor-84:ctx-649dbc0e ctx-e324e472) copyAsync inspecting src type 
SNAPSHOT copyAsync inspecting dest type SNAPSHOT
2014-10-07 16:51:22,201 DEBUG [c.c.a.t.Request] (Job-Executor-84:ctx-649dbc0e 
ctx-e324e472) Seq 1-949601544: Sending  { Cmd , MgmtId: 95545481387, via: 
1(x3.XXX), Ver: v1, Flags: 100011, 
[{"org.apache.cloudstack.storage.command.CopyCommand":{"srcTO":{"org.apache.cloudstack.storage.to.SnapshotObjectTO":{"path":"d38b38f3-ebda-4cf7-9701-4ba22409644c","volume":{"uuid":"72d5b956-fbaf-44c2-8aeb-df49354ddbb3","volumeType":"ROOT","dataStore":{"org.apache.cloudstack.storage.to.PrimaryDataStoreTO":{"uuid":"1c8dbf77-2b23-3244-91ee-5037cb2a55a8","id":208,"poolType":"IscsiLUN","host":"s2.v.XXX","path":"/iqn.2010-02.XXX:storage.XXX.s2/1","port":3260,"url":"IscsiLUN://s2.v.XXX//iqn.2010-02.XXX:storage.XXX.s2/1/?ROLE=Primary&STOREUUID=1c8dbf77-2b23-3244-91ee-5037cb2a55a8"}},"name":"ROOT-457","size":21474836480,"path":"5f54e049-7336-46bf-88be-c364624504f9","volumeId":556,"vmName":"i-30-457-VM","accountId":30,"format":"VHD","id":556,"deviceId":0,"hypervisorType":"XenServer"},"dataStore":{"org.apache.cloudstack.storage.to.PrimaryDataStoreTO":{"uuid":"1c8dbf77-2b23-3244-91ee-5037cb2a55a8","id":208,"poolType":"IscsiLUN","host":"s2.v.XXX","path":"/iqn.2010-02.XXX:storage.XXX.s2/1","port":3260,"url":"IscsiLUN://s2.v.XXX//iqn.2010-02.XXX:storage.XXX.s2/1/?ROLE=Primary&STOREUUID=1c8dbf77-2b23-3244-91ee-5037cb2a55a8"}},"vmName":"i-30-457-VM","name":"MInecraftDebian_ROOT-457_20141007145115","hypervisorType":"XenServer","id":977,"quiescevm":false,"physicalSize":0}},"destTO":{"org.apache.cloudstack.storage.to.SnapshotObjectTO":{"path":"snapshots/30/556","volume":{"uuid":"72d5b956-fbaf-44c2-8aeb-df49354ddbb3","volumeType":"ROOT","dataStore":{"org.apache.cloudstack.storage.to.PrimaryDataStoreTO":{"uuid":"1c8dbf77-2b23-3244-91ee-5037cb2a55a8","id":208,"poolType":"IscsiLUN","host":"s2.v.XXX","path":"/iqn.2010-02.XXX:storage.XXX.s2/1","port":3260,"url":"IscsiLUN://s2.v.XXX//iqn.2010-02.XXX:storage.XXX.s2/1/?ROLE=Primary&STOREUUID=1c8dbf77-2b23-3244-91ee-5037cb2a55a8"}},"name":"ROOT-457","size":21474836480,"path":"5f54e049-7336-46bf-88be-c364624504f9","volumeId":556,"vmName":"i-30-457-VM","accountId":30,"format":"VHD","id":556,"deviceId":0,"hypervisorType":"XenServer"},"dataStore":{"com.cloud.agent.api.to.NfsTO":{"_url":"nfs://s6.XXX/mnt/rootPool/nfsSecondary","_role":"Image"}},"vmName":"i-30-457-VM","name":"MInecraftDebian_ROOT-457_20141007145115","hypervisorType":"XenServer","id":977,"quiescevm":false,"physicalSize":0}},"executeInSequence":false,"options":{"fullSnapshot":"true"},"wait":21600}}]
 }
2014-10-07 16:51:22,201 DEBUG [c.c.a.t.Request] (Job-Executor-84:ctx-649dbc0e 
ctx-e324e472) Seq 1-949601544: Executing:  { Cmd , MgmtId: 95545481387, via: 
1(x3.XXX), Ver: v1, Flags: 100011, 
[{"org.apache.cloudstack.storage.command.CopyCommand":{"srcTO":{"org.apache.cloudstack.storage.to.SnapshotObjectTO":{"path":"d38b38f3-ebda-4cf7-9701-4ba22409644c","volume":{"uuid":"72d5b956-fbaf-44c2-8aeb-df49354ddbb3","volumeType":"ROOT","dataStore":{"org.apache.cloudstack.storage.to.PrimaryDataStoreTO":{"uuid":"1c8dbf77-2b23-3244-91ee-5037cb2a55a8","id":208,"poolType":"IscsiLUN","host":"s2.v.XXX","path":"/iqn.2010-02.XXX:storage.XXX.s2/1","port":3260,"url":"IscsiLUN://s2.v.XXX//iqn.2010-02.XXX:storage.XXX.s2/1/?ROLE=Primary&STOREUUID=1c8dbf77-2b23-3244-91ee-5037cb2a55a8"}},"name":"ROOT-457","size":21474836480,"path":"5f54e049-7336-46bf-88be-c364624504f9","volumeId":556,"vmName":"i-30-457-VM","accountId":30,"format":"VHD","id":556,"deviceId":0,"hypervisorType":"XenServer"},"dataStore":{"org.apache.cloudstack.storage.to.PrimaryDataStoreTO":{"uuid":"1c8dbf77-2b23-3244-91ee-5037cb2a55a8","id":208,"poolType":"IscsiLUN","host":"s2.v.XXX","path":"/iqn.2010-02.XXX:storage.XXX.s2/1","port":3260,"url":"IscsiLUN://s2.v.XXX//iqn.2010-02.XXX:storage.XXX.s2/1/?ROLE=Primary&STOREUUID=1c8dbf77-2b23-3244-91ee-5037cb2a55a8"}},"vmName":"i-30-457-VM","name":"MInecraftDebian_ROOT-457_20141007145115","hypervisorType":"XenServer","id":977,"quiescevm":false,"physicalSize":0}},"destTO":{"org.apache.cloudstack.storage.to.SnapshotObjectTO":{"path":"snapshots/30/556","volume":{"uuid":"72d5b956-fbaf-44c2-8aeb-df49354ddbb3","volumeType":"ROOT","dataStore":{"org.apache.cloudstack.storage.to.PrimaryDataStoreTO":{"uuid":"1c8dbf77-2b23-3244-91ee-5037cb2a55a8","id":208,"poolType":"IscsiLUN","host":"s2.v.XXX","path":"/iqn.2010-02.XXX:storage.XXX.s2/1","port":3260,"url":"IscsiLUN://s2.v.XXX//iqn.2010-02.XXX:storage.XXX.s2/1/?ROLE=Primary&STOREUUID=1c8dbf77-2b23-3244-91ee-5037cb2a55a8"}},"name":"ROOT-457","size":21474836480,"path":"5f54e049-7336-46bf-88be-c364624504f9","volumeId":556,"vmName":"i-30-457-VM","accountId":30,"format":"VHD","id":556,"deviceId":0,"hypervisorType":"XenServer"},"dataStore":{"com.cloud.agent.api.to.NfsTO":{"_url":"nfs://s6.XXX/mnt/rootPool/nfsSecondary","_role":"Image"}},"vmName":"i-30-457-VM","name":"MInecraftDebian_ROOT-457_20141007145115","hypervisorType":"XenServer","id":977,"quiescevm":false,"physicalSize":0}},"executeInSequence":false,"options":{"fullSnapshot":"true"},"wait":21600}}]
 }
2014-10-07 16:51:22,202 DEBUG [c.c.a.m.DirectAgentAttache] 
(DirectAgent-307:ctx-a2d8b59b) Seq 1-949601544: Executing request
2014-10-07 16:51:23,072 DEBUG [c.c.a.ApiServlet] 
(http-6443-exec-33:ctx-7d98629a) ===START===  XX.XX.XX.XX -- GET  
command=queryAsyncJobResult&jobId=89c49a6f-9d61-4bd8-a9ee-c41390ea3747&response=json&sessionkey=XXXX%3D&_=1412693535726
2014-10-07 16:51:23,091 DEBUG [c.c.h.x.r.CitrixResourceBase] 
(DirectAgent-307:ctx-a2d8b59b) Creating a not shared SR for 
nfs://s6.XXX/mnt/rootPool/nfsSecondary/snapshots/30/556
2014-10-07 16:51:23,254 DEBUG [c.c.a.ApiServlet] 
(http-6443-exec-33:ctx-7d98629a ctx-b1c48235) ===END===  XX.XX.XX.XX -- GET  
command=queryAsyncJobResult&jobId=89c49a6f-9d61-4bd8-a9ee-c41390ea3747&response=json&sessionkey=XXXXXD&_=1412693535726
2014-10-07 16:51:23,954 DEBUG [c.c.h.x.r.CitrixResourceBase] 
(DirectAgent-307:ctx-a2d8b59b) Checking 844c542f-2085-350d-8be6-2c2452eb3728 or 
SR 197c3580-fc82-35e5-356d-1f0909a9cfd9 on 
XS[f6d699aa-f58f-449e-9a51-6e965562f178-XX.XX.023]
2014-10-07 16:51:23,965 DEBUG [c.c.h.x.r.CitrixResourceBase] 
(DirectAgent-307:ctx-a2d8b59b) Host XX.XX.023 
OpaqueRef:72228e56-6e60-e1dc-677d-d1dd171045c7: Created a SR; UUID is 
197c3580-fc82-35e5-356d-1f0909a9cfd9 device config is 
{serverpath=/mnt/rootPool/nfsSecondary/snapshots/30/556, server=s6.XXX}
/////////////////////////////////////

At that time x3 hypervisor wrote the following to messages:
/////////////////////////////////////
Oct  7 16:51:34 x3 multipathd: dm-24: add map (uevent) 
Oct  7 16:51:34 x3 multipathd: dm-24: add map (uevent) 
Oct  7 16:51:34 x3 multipathd: dm-25: add map (uevent) 
Oct  7 16:51:34 x3 multipathd: dm-25: add map (uevent) 
Oct  7 16:51:34 x3 multipathd: dm-26: add map (uevent) 
Oct  7 16:51:34 x3 multipathd: dm-27: add map (uevent) 
Oct  7 16:51:34 x3 multipathd: dm-27: add map (uevent) 
Oct  7 16:51:34 x3 tapdisk[1677]: tapdisk-control: init, 10 x 4k buffers 
Oct  7 16:51:34 x3 tapdisk[1677]: I/O queue driver: lio 
Oct  7 16:51:34 x3 tapdisk[1677]: tapdisk-log: started, level 0 
Oct  7 16:51:34 x3 tapdisk[1677]: 
/dev/VG_XenStorage-3b6e386d-8736-6b6b-7006-f3f4df9bd586/VHD-d38b38f3-ebda-4cf7-9701-4ba22409644c
 version: tap 0x00010003, b: 10240, a: 0, f: 0, n: 0 
Oct  7 16:51:34 x3 tapdisk[1677]: opened image 
/dev/VG_XenStorage-3b6e386d-8736-6b6b-7006-f3f4df9bd586/VHD-d38b38f3-ebda-4cf7-9701-4ba22409644c
 (1 users, state: 0x00000003, type: 4, ro) 
Oct  7 16:51:34 x3 tapdisk[1677]: 
/dev/mapper/VG_XenStorage--3b6e386d--8736--6b6b--7006--f3f4df9bd586-VHD--a6e64bdc--9883--476f--87b1--07fc669eade7
 version: tap 0x00010003, b: 10240, a: 227, f: 1, n: 0 
Oct  7 16:51:34 x3 tapdisk[1677]: opened image 
/dev/mapper/VG_XenStorage--3b6e386d--8736--6b6b--7006--f3f4df9bd586-VHD--a6e64bdc--9883--476f--87b1--07fc669eade7
 (1 users, state: 0x00000003, type: 4, ro) 
Oct  7 16:51:34 x3 tapdisk[1677]: 
/dev/mapper/VG_XenStorage--3b6e386d--8736--6b6b--7006--f3f4df9bd586-VHD--19ef64e0--398a--43b4--ad52--1d36eedc2b81
 version: tap 0x00010003, b: 10240, a: 9422, f: 8614, n: 0 
Oct  7 16:51:34 x3 tapdisk[1677]: opened image 
/dev/mapper/VG_XenStorage--3b6e386d--8736--6b6b--7006--f3f4df9bd586-VHD--19ef64e0--398a--43b4--ad52--1d36eedc2b81
 (1 users, state: 0x00000003, type: 4, ro) 
Oct  7 16:51:34 x3 tapdisk[1677]: 
/dev/mapper/VG_XenStorage--3b6e386d--8736--6b6b--7006--f3f4df9bd586-VHD--dde0bd55--1ae3--44bf--be8d--dac901b49c66
 version: tap 0x00010003, b: 10240, a: 770, f: 372, n: 0 
Oct  7 16:51:34 x3 tapdisk[1677]: opened image 
/dev/mapper/VG_XenStorage--3b6e386d--8736--6b6b--7006--f3f4df9bd586-VHD--dde0bd55--1ae3--44bf--be8d--dac901b49c66
 (1 users, state: 0x00000003, type: 4, ro) 
Oct  7 16:51:34 x3 tapdisk[1677]: VBD CHAIN: 
Oct  7 16:51:34 x3 tapdisk[1677]: 
/dev/VG_XenStorage-3b6e386d-8736-6b6b-7006-f3f4df9bd586/VHD-d38b38f3-ebda-4cf7-9701-4ba22409644c:
 type:vhd(4) storage:lvm(3) 
Oct  7 16:51:34 x3 tapdisk[1677]: 
/dev/mapper/VG_XenStorage--3b6e386d--8736--6b6b--7006--f3f4df9bd586-VHD--a6e64bdc--9883--476f--87b1--07fc669eade7:
 type:vhd(4) storage:lvm(3) 
Oct  7 16:51:34 x3 tapdisk[1677]: 
/dev/mapper/VG_XenStorage--3b6e386d--8736--6b6b--7006--f3f4df9bd586-VHD--19ef64e0--398a--43b4--ad52--1d36eedc2b81:
 type:vhd(4) storage:lvm(3) 
Oct  7 16:51:34 x3 tapdisk[1677]: 
/dev/mapper/VG_XenStorage--3b6e386d--8736--6b6b--7006--f3f4df9bd586-VHD--dde0bd55--1ae3--44bf--be8d--dac901b49c66:
 type:vhd(4) storage:lvm(3) 
Oct  7 16:51:34 x3 tapdisk[1677]: bdev: capacity=41943040 sector_size=512/512 
flags=0
Oct  7 16:51:34 x3 multipathd: tdg: add path (uevent) 
Oct  7 16:51:34 x3 multipathd: tdg: failed to store path info 
Oct  7 16:51:34 x3 multipathd: uevent trigger error 
Oct  7 16:51:34 x3 kernel: block tdg: sector-size: 512/512 capacity: 41943040
Oct  7 16:51:34 x3 kernel: blkback: event-channel 85
Oct  7 16:51:34 x3 kernel: blkback: ring-ref 8
Oct  7 16:51:34 x3 kernel: blkback: protocol 1 (x86_32-abi)
Oct  7 16:51:34 x3 multipathd: xvda: add path (uevent) 
Oct  7 16:51:34 x3 multipathd: xvda: failed to store path info 
Oct  7 16:51:34 x3 multipathd: uevent trigger error 
Oct  7 16:51:34 x3 kernel: blkfront: xvda: barriers enabled
Oct  7 16:51:34 x3 kernel:  xvda: xvda1 xvda2 < xvda5 >
Oct  7 16:51:35 x3 vbd.uevent[add](backend/vbd/0/51712): wrote 
/xapi/0/hotplug/vbd/51712/hotplug = 'online'
Oct  7 16:51:35 x3 vbd.uevent[add](backend/vbd/0/51712): wrote 
backend/vbd/0/51712/hotplug-status = 'connected'
Oct  7 16:51:37 x3 tapdisk[2033]: tapdisk-control: init, 10 x 4k buffers 
Oct  7 16:51:37 x3 tapdisk[2033]: I/O queue driver: lio 
Oct  7 16:51:37 x3 tapdisk[2033]: tapdisk-log: started, level 0 
Oct  7 16:51:37 x3 tapdisk[2033]: 
/var/run/sr-mount/197c3580-fc82-35e5-356d-1f0909a9cfd9/3d732e11-8697-4a45-9518-44d4154ee6d6.vhd
 version: tap 0x00010003, b: 10240, a: 0, f: 0, n: 87 
Oct  7 16:51:37 x3 tapdisk[2033]: opened image 
/var/run/sr-mount/197c3580-fc82-35e5-356d-1f0909a9cfd9/3d732e11-8697-4a45-9518-44d4154ee6d6.vhd
 (1 users, state: 0x00000001, type: 4, rw) 
Oct  7 16:51:37 x3 tapdisk[2033]: VBD CHAIN: 
Oct  7 16:51:37 x3 tapdisk[2033]: 
/var/run/sr-mount/197c3580-fc82-35e5-356d-1f0909a9cfd9/3d732e11-8697-4a45-9518-44d4154ee6d6.vhd:
 type:vhd(4) storage:nfs(1) 
Oct  7 16:51:37 x3 tapdisk[2033]: bdev: capacity=41943040 sector_size=512/512 
flags=0
Oct  7 16:51:37 x3 multipathd: tdi: add path (uevent) 
Oct  7 16:51:37 x3 multipathd: tdi: failed to store path info 
Oct  7 16:51:37 x3 multipathd: uevent trigger error 
Oct  7 16:51:37 x3 kernel: block tdi: sector-size: 512/512 capacity: 41943040
Oct  7 16:51:37 x3 multipathd: xvdb: add path (uevent) 
Oct  7 16:51:37 x3 multipathd: xvdb: failed to store path info 
Oct  7 16:51:37 x3 multipathd: uevent trigger error 
Oct  7 16:51:37 x3 kernel: blkback: event-channel 87
Oct  7 16:51:37 x3 kernel: blkback: ring-ref 69
Oct  7 16:51:37 x3 kernel: blkback: protocol 1 (x86_32-abi)
Oct  7 16:51:37 x3 kernel: blkfront: xvdb: barriers enabled
Oct  7 16:51:37 x3 kernel:  xvdb: unknown partition table
Oct  7 16:51:37 x3 vbd.uevent[add](backend/vbd/0/51728): wrote 
/xapi/0/hotplug/vbd/51728/hotplug = 'online'
Oct  7 16:51:37 x3 vbd.uevent[add](backend/vbd/0/51728): wrote 
backend/vbd/0/51728/hotplug-status = 'connected'
Oct  7 16:51:38 x3 sparse_dd: [ info|x3.XXX|0||sparse_dd] streaming from raw 
/dev/xvda using BAT from 
/dev/VG_XenStorage-3b6e386d-8736-6b6b-7006-f3f4df9bd586/VHD-d38b38f3-ebda-4cf7-9701-4ba22409644c
 (relative to None) to raw file:///dev/xvdb
/////////////////////////////////////

This is the actual error, which a believe comes after the copy of the snapshot 
is made to secondary storage:
/////////////////////////////////////
2014-10-07 17:58:49,920 WARN  [c.c.h.x.r.CitrixResourceBase] 
(DirectAgent-307:ctx-a2d8b59b) Task failed! Task record:                 uuid: 
1258a9a9-1b7b-027c-5bfd-a210407b8ba5
           nameLabel: Async.host.call_plugin
     nameDescription: 
   allowedOperations: []
   currentOperations: {}
             created: Tue Oct 07 17:58:48 CEST 2014
            finished: Tue Oct 07 17:58:49 CEST 2014
              status: failure
          residentOn: com.xensource.xenapi.Host@c612622b
            progress: 1.0
                type: <none/>
              result: 
           errorInfo: [XENAPI_PLUGIN_FAILURE, getSnapshotSize, 
CommandException, 2]
         otherConfig: {}
           subtaskOf: com.xensource.xenapi.Task@aaf13f6f
            subtasks: []

2014-10-07 17:58:49,929 WARN  [c.c.h.x.r.CitrixResourceBase] 
(DirectAgent-307:ctx-a2d8b59b) callHostPlugin failed for cmd: getSnapshotSize 
with args snapshotUuid: 3d732e11-8697-4a45-9518-44d4154ee6d6, isISCSI: true, 
primaryStorageSRUuid: 197c3580-fc82-35e5-356d-1f0909a9cfd9,  due to Task 
failed! Task record:                 uuid: 1258a9a9-1b7b-027c-5bfd-a210407b8ba5
           nameLabel: Async.host.call_plugin
     nameDescription: 
   allowedOperations: []
   currentOperations: {}
             created: Tue Oct 07 17:58:48 CEST 2014
            finished: Tue Oct 07 17:58:49 CEST 2014
              status: failure
          residentOn: com.xensource.xenapi.Host@c612622b
            progress: 1.0
                type: <none/>
              result: 
           errorInfo: [XENAPI_PLUGIN_FAILURE, getSnapshotSize, 
CommandException, 2]
         otherConfig: {}
           subtaskOf: com.xensource.xenapi.Task@aaf13f6f
            subtasks: []

Task failed! Task record:                 uuid: 
1258a9a9-1b7b-027c-5bfd-a210407b8ba5
           nameLabel: Async.host.call_plugin
     nameDescription: 
   allowedOperations: []
   currentOperations: {}
             created: Tue Oct 07 17:58:48 CEST 2014
            finished: Tue Oct 07 17:58:49 CEST 2014
              status: failure
          residentOn: com.xensource.xenapi.Host@c612622b
            progress: 1.0
                type: <none/>
              result: 
           errorInfo: [XENAPI_PLUGIN_FAILURE, getSnapshotSize, 
CommandException, 2]
         otherConfig: {}
           subtaskOf: com.xensource.xenapi.Task@aaf13f6f
            subtasks: []

        at 
com.cloud.hypervisor.xen.resource.CitrixResourceBase.checkForSuccess(CitrixResourceBase.java:3764)
        at 
com.cloud.hypervisor.xen.resource.CitrixResourceBase.callHostPluginAsync(CitrixResourceBase.java:3971)
        at 
com.cloud.hypervisor.xen.resource.XenServerStorageProcessor.getSnapshotSize(XenServerStorageProcessor.java:1161)
        at 
com.cloud.hypervisor.xen.resource.XenServerStorageProcessor.backupSnapshot(XenServerStorageProcessor.java:1348)
        at 
com.cloud.storage.resource.StorageSubsystemCommandHandlerBase.execute(StorageSubsystemCommandHandlerBase.java:90)
        at 
com.cloud.storage.resource.StorageSubsystemCommandHandlerBase.handleStorageCommands(StorageSubsystemCommandHandlerBase.java:50)
        at 
com.cloud.hypervisor.xen.resource.CitrixResourceBase.executeRequest(CitrixResourceBase.java:609)
        at 
com.cloud.hypervisor.xen.resource.XenServer56Resource.executeRequest(XenServer56Resource.java:59)
        at 
com.cloud.agent.manager.DirectAgentAttache$Task.runInContext(DirectAgentAttache.java:216)
        at 
org.apache.cloudstack.managed.context.ManagedContextRunnable$1.run(ManagedContextRunnable.java:49)
        at 
org.apache.cloudstack.managed.context.impl.DefaultManagedContext$1.call(DefaultManagedContext.java:56)
        at 
org.apache.cloudstack.managed.context.impl.DefaultManagedContext.callWithContext(DefaultManagedContext.java:103)
        at 
org.apache.cloudstack.managed.context.impl.DefaultManagedContext.runWithContext(DefaultManagedContext.java:53)
        at 
org.apache.cloudstack.managed.context.ManagedContextRunnable.run(ManagedContextRunnable.java:46)
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
        at java.util.concurrent.FutureTask.run(FutureTask.java:166)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(ScheduledThreadPoolExecutor.java:165)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:266)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1146)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:701)
2014-10-07 17:58:49,945 DEBUG [c.c.h.x.r.CitrixResourceBase] 
(DirectAgent-307:ctx-a2d8b59b) Host XX.XX.023 
OpaqueRef:72228e56-6e60-e1dc-677d-d1dd171045c7: Removing SR
2014-10-07 17:58:49,976 DEBUG [c.c.h.x.r.CitrixResourceBase] 
(DirectAgent-307:ctx-a2d8b59b) Host XX.XX.023 
OpaqueRef:417a2b3b-8042-359e-6394-180cbf82f600: Unplugging pbd
2014-10-07 17:58:50,423 DEBUG [c.c.a.ApiServlet] 
(http-6443-exec-42:ctx-b31e9f9b) ===START===  XX.XX.XX.XX -- GET  
command=queryAsyncJobResult&jobId=89c49a6f-9d61-4bd8-a9ee-c41390ea3747&response=json&sessionkey=vnXXXXXXX%3D&_=1412697583219
2014-10-07 17:58:50,446 DEBUG [c.c.a.ApiServlet] 
(http-6443-exec-42:ctx-b31e9f9b ctx-b14e1b8b) ===END===  XX.XX.XX.XX -- GET  
command=queryAsyncJobResult&jobId=89c49a6f-9d61-4bd8-a9ee-c41390ea3747&response=json&sessionkey=vnXXXXXXX%3D&_=1412697583219
2014-10-07 17:58:50,529 DEBUG [c.c.h.x.r.CitrixResourceBase] 
(DirectAgent-307:ctx-a2d8b59b) Host XX.XX.023 
OpaqueRef:72228e56-6e60-e1dc-677d-d1dd171045c7: Forgetting
2014-10-07 17:58:50,535 DEBUG [c.c.s.StatsCollector] 
(StatsCollector-3:ctx-222d1581) VmStatsCollector is running...
2014-10-07 17:58:50,555 DEBUG [c.c.a.m.DirectAgentAttache] 
(DirectAgent-418:ctx-665da9a5) Seq 1-949601730: Executing request
2014-10-07 17:58:50,979 DEBUG [c.c.h.x.r.CitrixResourceBase] 
(DirectAgent-418:ctx-665da9a5) Vm cpu utilization 0.98
2014-10-07 17:58:50,979 DEBUG [c.c.h.x.r.CitrixResourceBase] 
(DirectAgent-418:ctx-665da9a5) Vm cpu utilization 7.2124999999999995
2014-10-07 17:58:50,979 DEBUG [c.c.h.x.r.CitrixResourceBase] 
(DirectAgent-418:ctx-665da9a5) Vm cpu utilization 1.3299999999999998
2014-10-07 17:58:50,979 DEBUG [c.c.h.x.r.CitrixResourceBase] 
(DirectAgent-418:ctx-665da9a5) Vm cpu utilization 0.27
2014-10-07 17:58:51,013 WARN  [c.c.h.x.r.CitrixResourceBase] 
(DirectAgent-418:ctx-665da9a5) Error while collecting disk stats from : 
You gave an invalid object reference.  The object may have recently been 
deleted.  The class parameter gives the type of reference given, and the handle 
parameter echoes the bad value given.
        at com.xensource.xenapi.Types.checkResponse(Types.java:209)
        at com.xensource.xenapi.Connection.dispatch(Connection.java:368)
        at 
com.cloud.hypervisor.xen.resource.XenServerConnectionPool$XenServerConnection.dispatch(XenServerConnectionPool.java:909)
        at com.xensource.xenapi.VBDMetrics.getIoReadKbs(VBDMetrics.java:210)
        at 
com.cloud.hypervisor.xen.resource.CitrixResourceBase.getVmStats(CitrixResourceBase.java:2863)
        at 
com.cloud.hypervisor.xen.resource.CitrixResourceBase.execute(CitrixResourceBase.java:2763)
        at 
com.cloud.hypervisor.xen.resource.CitrixResourceBase.executeRequest(CitrixResourceBase.java:493)
        at 
com.cloud.hypervisor.xen.resource.XenServer56Resource.executeRequest(XenServer56Resource.java:59)
        at 
com.cloud.agent.manager.DirectAgentAttache$Task.runInContext(DirectAgentAttache.java:216)
        at 
org.apache.cloudstack.managed.context.ManagedContextRunnable$1.run(ManagedContextRunnable.java:49)
        at 
org.apache.cloudstack.managed.context.impl.DefaultManagedContext$1.call(DefaultManagedContext.java:56)
        at 
org.apache.cloudstack.managed.context.impl.DefaultManagedContext.callWithContext(DefaultManagedContext.java:103)
        at 
org.apache.cloudstack.managed.context.impl.DefaultManagedContext.runWithContext(DefaultManagedContext.java:53)
        at 
org.apache.cloudstack.managed.context.ManagedContextRunnable.run(ManagedContextRunnable.java:46)
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
        at java.util.concurrent.FutureTask.run(FutureTask.java:166)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(ScheduledThreadPoolExecutor.java:165)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:266)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1146)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:701)
2014-10-07 17:58:51,036 DEBUG [c.c.a.m.DirectAgentAttache] 
(DirectAgent-418:ctx-665da9a5) Seq 1-949601730: Response Received: 
2014-10-07 17:58:51,036 DEBUG [c.c.a.t.Request] (StatsCollector-3:ctx-222d1581) 
Seq 1-949601730: Received:  { Ans: , MgmtId: 95545481387, via: 1, Ver: v1, 
Flags: 10, { GetVmStatsAnswer } }
2014-10-07 17:58:51,061 DEBUG [c.c.a.m.DirectAgentAttache] 
(DirectAgent-165:ctx-3c5b0bdc) Seq 2-1824254287: Executing request
2014-10-07 17:58:51,627 DEBUG [c.c.h.x.r.CitrixResourceBase] 
(DirectAgent-165:ctx-3c5b0bdc) Vm cpu utilization 0.53
2014-10-07 17:58:51,627 DEBUG [c.c.h.x.r.CitrixResourceBase] 
(DirectAgent-165:ctx-3c5b0bdc) Vm cpu utilization 37.46
2014-10-07 17:58:51,627 DEBUG [c.c.h.x.r.CitrixResourceBase] 
(DirectAgent-165:ctx-3c5b0bdc) Vm cpu utilization 0.62
2014-10-07 17:58:51,627 DEBUG [c.c.h.x.r.CitrixResourceBase] 
(DirectAgent-165:ctx-3c5b0bdc) Vm cpu utilization 3.375
2014-10-07 17:58:51,627 DEBUG [c.c.h.x.r.CitrixResourceBase] 
(DirectAgent-165:ctx-3c5b0bdc) Vm cpu utilization 0.54
2014-10-07 17:58:51,627 DEBUG [c.c.h.x.r.CitrixResourceBase] 
(DirectAgent-165:ctx-3c5b0bdc) Vm cpu utilization 60.28
2014-10-07 17:58:51,627 DEBUG [c.c.h.x.r.CitrixResourceBase] 
(DirectAgent-165:ctx-3c5b0bdc) Vm cpu utilization 0.63
2014-10-07 17:58:51,660 WARN  [c.c.h.x.r.CitrixResourceBase] 
(DirectAgent-165:ctx-3c5b0bdc) Error while collecting disk stats from : 
You gave an invalid object reference.  The object may have recently been 
deleted.  The class parameter gives the type of reference given, and the handle 
parameter echoes the bad value given.
        at com.xensource.xenapi.Types.checkResponse(Types.java:209)
        at com.xensource.xenapi.Connection.dispatch(Connection.java:368)
        at 
com.cloud.hypervisor.xen.resource.XenServerConnectionPool$XenServerConnection.dispatch(XenServerConnectionPool.java:909)
        at com.xensource.xenapi.VBDMetrics.getIoReadKbs(VBDMetrics.java:210)
        at 
com.cloud.hypervisor.xen.resource.CitrixResourceBase.getVmStats(CitrixResourceBase.java:2863)
        at 
com.cloud.hypervisor.xen.resource.CitrixResourceBase.execute(CitrixResourceBase.java:2763)
        at 
com.cloud.hypervisor.xen.resource.CitrixResourceBase.executeRequest(CitrixResourceBase.java:493)
        at 
com.cloud.hypervisor.xen.resource.XenServer56Resource.executeRequest(XenServer56Resource.java:59)
        at 
com.cloud.agent.manager.DirectAgentAttache$Task.runInContext(DirectAgentAttache.java:216)
        at 
org.apache.cloudstack.managed.context.ManagedContextRunnable$1.run(ManagedContextRunnable.java:49)
        at 
org.apache.cloudstack.managed.context.impl.DefaultManagedContext$1.call(DefaultManagedContext.java:56)
        at 
org.apache.cloudstack.managed.context.impl.DefaultManagedContext.callWithContext(DefaultManagedContext.java:103)
        at 
org.apache.cloudstack.managed.context.impl.DefaultManagedContext.runWithContext(DefaultManagedContext.java:53)
        at 
org.apache.cloudstack.managed.context.ManagedContextRunnable.run(ManagedContextRunnable.java:46)
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
        at java.util.concurrent.FutureTask.run(FutureTask.java:166)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(ScheduledThreadPoolExecutor.java:165)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:266)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1146)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:701)
2014-10-07 17:58:51,683 DEBUG [c.c.a.m.DirectAgentAttache] 
(DirectAgent-165:ctx-3c5b0bdc) Seq 2-1824254287: Response Received: 
2014-10-07 17:58:51,683 DEBUG [c.c.a.t.Request] (StatsCollector-3:ctx-222d1581) 
Seq 2-1824254287: Received:  { Ans: , MgmtId: 95545481387, via: 2, Ver: v1, 
Flags: 10, { GetVmStatsAnswer } }
2014-10-07 17:58:51,708 DEBUG [c.c.a.m.DirectAgentAttache] 
(DirectAgent-16:ctx-3d6b458a) Seq 3-1392049173: Executing request
2014-10-07 17:58:51,733 DEBUG [c.c.h.x.r.XenServerStorageProcessor] 
(DirectAgent-307:ctx-a2d8b59b) Successfully destroyed snapshot on volume: 
5f54e049-7336-46bf-88be-c364624504f9 execept this current snapshot 
d38b38f3-ebda-4cf7-9701-4ba22409644c
2014-10-07 17:58:51,734 DEBUG [c.c.a.m.DirectAgentAttache] 
(DirectAgent-307:ctx-a2d8b59b) Seq 1-949601544: Response Received: 
2014-10-07 17:58:51,734 DEBUG [c.c.a.t.Request] (DirectAgent-307:ctx-a2d8b59b) 
Seq 1-949601544: Processing:  { Ans: , MgmtId: 95545481387, via: 1, Ver: v1, 
Flags: 10, 
[{"org.apache.cloudstack.storage.command.CopyCmdAnswer":{"newData":{"org.apache.cloudstack.storage.to.SnapshotObjectTO":{"path":"snapshots/30/556/3d732e11-8697-4a45-9518-44d4154ee6d6","id":0,"quiescevm":false,"physicalSize":0}},"result":true,"wait":0}}]
 }
2014-10-07 17:58:51,734 DEBUG [c.c.a.t.Request] (Job-Executor-84:ctx-649dbc0e 
ctx-e324e472) Seq 1-949601544: Received:  { Ans: , MgmtId: 95545481387, via: 1, 
Ver: v1, Flags: 10, { CopyCmdAnswer } }
2014-10-07 17:58:51,784 DEBUG [o.a.c.f.j.i.AsyncJobManagerImpl] 
(Job-Executor-84:ctx-649dbc0e ctx-e324e472) Complete async job-2171, jobStatus: 
SUCCEEDED, resultCode: 0, result: 
org.apache.cloudstack.api.response.SnapshotResponse/snapshot/{"id":"a5df5f35-c5f6-4644-a569-9bd4a26e500d","account":"martinG","domainid":"1268ca9a-7ec5-4154-9839-9b90699dfa4b","domain":"ROOT","snapshottype":"MANUAL","volumeid":"72d5b956-fbaf-44c2-8aeb-df49354ddbb3","volumename":"ROOT-457","volumetype":"ROOT","created":"2014-10-07T16:51:15+0200","name":"MInecraftDebian_ROOT-457_20141007145115","intervaltype":"MANUAL","state":"Allocated","tags":[],"revertable":false}
/////////////////////////////////////

At that time the x3 hypervisor wrote this to messages:
/////////////////////////////////////
Oct  7 17:58:42 x3 multipathd: xvdb: remove path (uevent) 
Oct  7 17:58:42 x3 multipathd: xvdb: spurious uevent, path not in pathvec 
Oct  7 17:58:42 x3 multipathd: uevent trigger error 
Oct  7 17:58:42 x3 vbd.uevent[remove](backend/vbd/0/51728): removed 
/xapi/0/hotplug/vbd/51728/hotplug
Oct  7 17:58:42 x3 vbd.uevent[remove](backend/vbd/0/51728): removed 
backend/vbd/0/51728/hotplug-status
Oct  7 17:58:43 x3 multipathd: tdi: remove path (uevent) 
Oct  7 17:58:43 x3 multipathd: tdi: spurious uevent, path not in pathvec 
Oct  7 17:58:43 x3 multipathd: uevent trigger error 
Oct  7 17:58:43 x3 tapdisk[2033]: gaps written/skipped: 0/0 
Oct  7 17:58:43 x3 tapdisk[2033]: 
/var/run/sr-mount/197c3580-fc82-35e5-356d-1f0909a9cfd9/3d732e11-8697-4a45-9518-44d4154ee6d6.vhd:
 b: 10240, a: 9510, f: 9510, n: 39029120 
Oct  7 17:58:43 x3 tapdisk[2033]: closed image 
/var/run/sr-mount/197c3580-fc82-35e5-356d-1f0909a9cfd9/3d732e11-8697-4a45-9518-44d4154ee6d6.vhd
 (0 users, state: 0x00000000, type: 4) 
Oct  7 17:58:43 x3 tapdisk[2033]: tapdisk-log: closing after 0 errors 
Oct  7 17:58:43 x3 tapdisk[2033]: tapdisk-syslog: 11 messages, 893 bytes, 
xmits: 12, failed: 0, dropped: 0
Oct  7 17:58:43 x3 tapdisk[2033]: tapdisk-control: draining 1 connections 
Oct  7 17:58:43 x3 tapdisk[2033]: tapdisk-control: done 
Oct  7 17:58:44 x3 ovs-vswitchd: 46807|timeval|WARN|9 ms poll interval (0 ms 
user, 0 ms system) is over 14 times the weighted mean interval 1 ms (54312674 
samples)
Oct  7 17:58:44 x3 ovs-vswitchd: 46808|coverage|INFO|Skipping details of 
duplicate event coverage for hash=735285a1 in epoch 54312674
Oct  7 17:58:44 x3 multipathd: xvda: remove path (uevent) 
Oct  7 17:58:44 x3 multipathd: xvda: spurious uevent, path not in pathvec 
Oct  7 17:58:44 x3 multipathd: uevent trigger error 
Oct  7 17:58:44 x3 vbd.uevent[remove](backend/vbd/0/51712): removed 
/xapi/0/hotplug/vbd/51712/hotplug
Oct  7 17:58:44 x3 vbd.uevent[remove](backend/vbd/0/51712): removed 
backend/vbd/0/51712/hotplug-status
Oct  7 17:58:45 x3 multipathd: tdg: remove path (uevent) 
Oct  7 17:58:45 x3 multipathd: tdg: spurious uevent, path not in pathvec 
Oct  7 17:58:45 x3 tapdisk[1677]: gaps written/skipped: 0/0 
Oct  7 17:58:45 x3 multipathd: uevent trigger error 
Oct  7 17:58:45 x3 tapdisk[1677]: 
/dev/VG_XenStorage-3b6e386d-8736-6b6b-7006-f3f4df9bd586/VHD-d38b38f3-ebda-4cf7-9701-4ba22409644c:
 b: 10240, a: 0, f: 0, n: 0 
Oct  7 17:58:45 x3 tapdisk[1677]: closed image 
/dev/VG_XenStorage-3b6e386d-8736-6b6b-7006-f3f4df9bd586/VHD-d38b38f3-ebda-4cf7-9701-4ba22409644c
 (0 users, state: 0x00000002, type: 4) 
Oct  7 17:58:45 x3 tapdisk[1677]: gaps written/skipped: 0/0 
Oct  7 17:58:45 x3 tapdisk[1677]: 
/dev/mapper/VG_XenStorage--3b6e386d--8736--6b6b--7006--f3f4df9bd586-VHD--a6e64bdc--9883--476f--87b1--07fc669eade7:
 b: 10240, a: 227, f: 1, n: 0 
Oct  7 17:58:45 x3 tapdisk[1677]: closed image 
/dev/mapper/VG_XenStorage--3b6e386d--8736--6b6b--7006--f3f4df9bd586-VHD--a6e64bdc--9883--476f--87b1--07fc669eade7
 (0 users, state: 0x00000002, type: 4) 
Oct  7 17:58:45 x3 tapdisk[1677]: gaps written/skipped: 0/0 
Oct  7 17:58:45 x3 tapdisk[1677]: 
/dev/mapper/VG_XenStorage--3b6e386d--8736--6b6b--7006--f3f4df9bd586-VHD--19ef64e0--398a--43b4--ad52--1d36eedc2b81:
 b: 10240, a: 9422, f: 8614, n: 0 
Oct  7 17:58:45 x3 tapdisk[1677]: closed image 
/dev/mapper/VG_XenStorage--3b6e386d--8736--6b6b--7006--f3f4df9bd586-VHD--19ef64e0--398a--43b4--ad52--1d36eedc2b81
 (0 users, state: 0x00000002, type: 4) 
Oct  7 17:58:45 x3 tapdisk[1677]: gaps written/skipped: 0/0 
Oct  7 17:58:45 x3 tapdisk[1677]: 
/dev/mapper/VG_XenStorage--3b6e386d--8736--6b6b--7006--f3f4df9bd586-VHD--dde0bd55--1ae3--44bf--be8d--dac901b49c66:
 b: 10240, a: 770, f: 372, n: 0 
Oct  7 17:58:45 x3 tapdisk[1677]: closed image 
/dev/mapper/VG_XenStorage--3b6e386d--8736--6b6b--7006--f3f4df9bd586-VHD--dde0bd55--1ae3--44bf--be8d--dac901b49c66
 (0 users, state: 0x00000002, type: 4) 
Oct  7 17:58:45 x3 tapdisk[1677]: tapdisk-log: closing after 0 errors 
Oct  7 17:58:46 x3 tapdisk[1677]: tapdisk-syslog: 14 messages, 1425 bytes, 
xmits: 15, failed: 0, dropped: 0
Oct  7 17:58:45 x3 tapdisk[1677]: tapdisk-control: draining 1 connections 
Oct  7 17:58:45 x3 tapdisk[1677]: tapdisk-control: done 
Oct  7 17:58:46 x3 multipathd: dm-24: remove map (uevent) 
Oct  7 17:58:46 x3 multipathd: dm-24: devmap not registered, can't remove 
Oct  7 17:58:46 x3 multipathd: dm-24: remove map (uevent) 
Oct  7 17:58:46 x3 multipathd: dm-24: devmap not registered, can't remove 
Oct  7 17:58:46 x3 multipathd: dm-27: remove map (uevent) 
Oct  7 17:58:46 x3 multipathd: dm-27: devmap not registered, can't remove 
Oct  7 17:58:46 x3 multipathd: dm-27: remove map (uevent) 
Oct  7 17:58:46 x3 multipathd: dm-27: devmap not registered, can't remove 
Oct  7 17:58:46 x3 multipathd: dm-25: remove map (uevent) 
Oct  7 17:58:46 x3 multipathd: dm-25: devmap not registered, can't remove 
Oct  7 17:58:47 x3 multipathd: dm-25: remove map (uevent) 
Oct  7 17:58:47 x3 multipathd: dm-25: devmap not registered, can't remove 
Oct  7 17:58:47 x3 multipathd: dm-26: remove map (uevent) 
Oct  7 17:58:47 x3 multipathd: dm-26: devmap not registered, can't remove 
Oct  7 17:58:47 x3 multipathd: dm-26: remove map (uevent) 
Oct  7 17:58:47 x3 multipathd: dm-26: devmap not registered, can't remove 
Oct  7 17:58:49 x3 vhd-util: libvhd::vhd_open: failed to open 
/dev/VG_XenStorage-197c3580-fc82-35e5-356d-1f0909a9cfd9/VHD-3d732e11-8697-4a45-9518-44d4154ee6d6:
 -2 
/////////////////////////////////////

vhd-utils on x3:

[root@x3 log]# find / -name vhd-util
/usr/sbin/vhd-util
/opt/xensource/bin/vhd-util
/opt/cloud/bin/vhd-util
find: /proc/7815/net: Invalid argument
[root@x3 log]# md5sum /usr/sbin/vhd-util
c849eae34a76f18163ffeea7ae1008fe  /usr/sbin/vhd-util
[root@x3 log]# md5sum /opt/xensource/bin/vhd-util
2f3b434842d25d9672cc0a75d103ae90  /opt/xensource/bin/vhd-util
[root@x3 log]# md5sum /opt/cloud/bin/vhd-util
2f3b434842d25d9672cc0a75d103ae90  /opt/cloud/bin/vhd-util

Also in XenCenter I can still see MInecraftDebian_ROOT-457_20141007145115.

Thank you for your time.
Regads,
F.

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