Hello,
I'm facing a strange issue on my OVirt Dev pool.
Indeed, when I create high disk load a VM (kickstart installation or iozone
test for example) , VM is paused due to storage I/O error.
Problem is 100% reproducible, and is located only on NFS (v3 and v4) on my EMC
VNXe3200 NAS's (I have a 10TB and a 20TB NAS)
I have done test (simple iozone -a) with VM 1 vCPU / 2GB RAM and 2 disk
(1*20GB + 1*10GB). Both VMs disk are placed into the same SAN / NAS for each
test. Results are:
- EMC VNXe3200 (10TB) NFSv3 => VM stopped after 10- 30s iozone lauch
- EMC VNXe3200 (20TB) NFSv3 => VM stopped after 10- 30s iozone lauch
- EMC VNXe3200 (10TB) ISCSI => No problem, iozone test finish, and performance
are "standard" regarding load of the VNXe (60MB/s sequential Write for info)
- EMC VNXe3200 (20TB) ISCSI=> No problem, iozone test finish, and performance
are "standard"regarding load of the VNXe (40-60MB/S sequential Write for info)
- NETAPP FAS2240 NFSv3 => No problem, iozone test finish, and performance are
good (100MB/s sequential Write for info)
- Freebsd10 NAS NFSv3 => No problem, iozone test finish, and performance are
good regarding NAS conf (80MB/s sequential Write for info)
I can't explain why I have an issue on NFS and I have not issue on ISCSI (on
the same EMC VNxe3200...).
NFS default params are keeped when storage added to
datacenter:(rw,relatime,vers=4.0,rsize=131072,wsize=131072,namlen=255,soft,nosharecache,proto=tcp,port=0,timeo=600,retrans=6,sec=sys,clientaddr=XXXXXXX,local_lock=none,addr=XXXXXX)
(rw,relatime,vers=3,rsize=131072,wsize=131072,namlen=255,soft,nolock,nosharecache,proto=tcp,timeo=600,retrans=6,sec=sys,mountaddr=XXXXXX,mountvers=3,mountport=1234,mountproto=udp,local_lock=all,addr=XXXXXX)
Debug logs on host does not help me a lot:
2018-08-22 15:36:13,883+0200 INFO (periodic/22) [vdsm.api] START
multipath_health() from=internal, task_id=53da2eca-eb66-400c-8367-ab62cedc5dc1
(api:46)
2018-08-22 15:36:13,883+0200 INFO (periodic/22) [vdsm.api] FINISH
multipath_health return={} from=internal,
task_id=53da2eca-eb66-400c-8367-ab62cedc5dc1 (api:52)
2018-08-22 15:36:15,161+0200 INFO (libvirt/events) [virt.vm]
(vmId='b139a9b9-16bc-40ee-ba84-d1d59e5ce17a') abnormal vm stop device
ua-179375b0-0a18-4fcb-a884-4aeb1c
8fed97 error eother (vm:5116)
2018-08-22 15:36:15,161+0200 INFO (libvirt/events) [virt.vm]
(vmId='b139a9b9-16bc-40ee-ba84-d1d59e5ce17a') CPU stopped: onIOError (vm:6157)
2018-08-22 15:36:15,162+0200 DEBUG (libvirt/events) [virt.metadata.Descriptor]
values: {'minGuaranteedMemoryMb': 1024, 'clusterVersion': '4.2',
'resumeBehavior': 'au to_resume',
'memGuaranteedSize': 1024, 'launchPaused': 'false', 'startTime':
1534944832.058459, 'destroy_on_reboot': False, 'pauseTime': 4999289.49}
(metadata:596)
2018-08-22 15:36:15,162+0200 DEBUG (libvirt/events) [virt.metadata.Descriptor]
values updated: {'minGuaranteedMemoryMb': 1024, 'clusterVersion': '4.2',
'resumeBehavi or': 'auto_resume',
'memGuaranteedSize': 1024, 'launchPaused': 'false', 'startTime':
1534944832.058459, 'destroy_on_reboot': False, 'pauseTime': 4999289.49}
(metadat a:601)
2018-08-22 15:36:15,168+0200 DEBUG (libvirt/events) [virt.metadata.Descriptor]
dumped metadata for b139a9b9-16bc-40ee-ba84-d1d59e5ce17a: <?xml version='1.0'
encoding
metadata blablablabla............................>
2018-08-22 15:36:15,169+0200 DEBUG (libvirt/events) [virt.vm]
(vmId='b139a9b9-16bc-40ee-ba84-d1d59e5ce17a') event Suspended detail 2 opaque
None (vm:5520)
2018-08-22 15:36:15,169+0200 INFO (libvirt/events) [virt.vm]
(vmId='b139a9b9-16bc-40ee-ba84-d1d59e5ce17a') CPU stopped: onSuspend (vm:6157)
2018-08-22 15:36:15,174+0200 WARN (libvirt/events) [virt.vm]
(vmId='b139a9b9-16bc-40ee-ba84-d1d59e5ce17a') device sda reported I/O error
(vm:4065)
2018-08-22 15:36:15,340+0200 DEBUG (vmchannels) [virt.vm]
(vmId='46d496af-e2d0-4caa-9a13-10c624f265d8') Guest's message heartbeat:
{u'memory-stat': {u'swap_out': 0,
u'majflt': 0, u'swap_usage': 0, u'mem_cached': 119020, u'mem_free': 3693900,
u'mem_buffers': 2108, u'swap_in': 0, u'swap_total': 8257532, u'pageflt': 141,
u'mem_tota l': 3878980,
u'mem_unused': 3572772}, u'free-ram': u'3607', u'apiVersion': 3}
(guestagent:337)
Do you have some idea ?
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