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https://issues.apache.org/jira/browse/CLOUDSTACK-3809?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Harikrishna Patnala resolved CLOUDSTACK-3809.
---------------------------------------------
Resolution: Not A Problem
> there is calculation mismatch for Total,used , available capacity in CS for
> xen cluster and on xen host
> ----------------------------------------------------------------------------------------------------------
>
> Key: CLOUDSTACK-3809
> URL: https://issues.apache.org/jira/browse/CLOUDSTACK-3809
> Project: CloudStack
> Issue Type: Bug
> Security Level: Public(Anyone can view this level - this is the
> default.)
> Affects Versions: 4.2.0
> Environment: branch 4.2;hypervisor =xen
> Reporter: prashant kumar mishra
> Assignee: Harikrishna Patnala
> Priority: Critical
> Fix For: 4.2.0
>
> Attachments: Logs_XS_DB.rar, screenshot-1.jpg, screenshot-2.jpg,
> VMs_with_scaleup_flag_False.jpg
>
>
> Memory calculation on xen host and CS
> ================================
> AVL MEM=available memory
> ON CS (in MB) || ON XEN HOST(in MB)
>
> TOTAL 15440.137 ||
> 16374
> USED 14208 ||
> 15924
>
> AVL MEM 1232.137 ||
> 451
> Total MEM difference =1232.137 - 451 = 781.137
> Due to this mismatch allocator chose the host but vm deployment fails at run
> time
> 1-2013-07-25 14:21:32,101 DEBUG [cloud.vm.VirtualMachineManagerImpl]
> (Job-Executor-12:job-24 = [ 6f32f9f4-5185-411f-b75e-3c05cbb475f4 ])
> Deployment found - P0=VM[User|test12],
> P0=Dest[Zone(Id)-Pod(Id)-Cluster(Id)-Host(Id)-Storage(Volume(Id|Type-->Pool(Id))]
> : Dest[Zone(1)-Pod(1)-Cluster(1)-Host(1)-Storage(Volume(29|ROOT-->Pool(1))]
> 2- errorInfo: [HOST_NOT_ENOUGH_FREE_MEMORY, 588251136, 469716992]
> Steps to reproduce
> -----------------------------
> 1-preapre a CS setup with a xen 6.1 host(advance license)
> 2-create a service offering say ram (cpu=500,RAM=3.00 GB)
> 4- set cluster.(cpu/memory).allocated.capacity.disablethreshold to one
> 5-set enable.dynamic.scale.vm to true
> 6-deploy some vms using SO ram , SO small instance ( in my setup i was able
> to deploy 4 vm with SO ram +1vms with SO small instance)
> 7-if vms are scalable then on host AVL MEM= 425 MB and if vms are not
> scalable then AVL MEM = 523 (please check screenshot for more details)
> Expected
> ----------------
> Deployment should be successful
> Actual
> --------------
> deployment failed with run time error
> My observation
> -------------------------
> 1->Memory overhead for vm deployed with 3 GB ram is 129 MB and for vm with
> 512 MB ram is 49 MB
> 2-> four VM 129*4=516 + For two small vm 49*1=49 +system vm overhead 41(cpvm)
> +35(ssvm) +34 (rvm)
> 3->Total overhead= 516+98+41+35+34=675 MB which is nearly equal to total MEM
> difference
> 4-->we should also consider memory overhead and should add it in used
> capacity to minimize this gap
> DB:
> ====
> mysql> select * from op_host_capacity where capacity_type=0\G;
> *************************** 1. row ***************************
> id: 1
> host_id: 1
> data_center_id: 1
> pod_id: 1
> cluster_id: 1
> used_capacity: 14898167808
> reserved_capacity: 0
> total_capacity: 16190157312
> capacity_type: 0
> capacity_state: Enabled
> update_time: 2013-07-25 18:21:47
> created: 2013-07-25 15:40:51
> 1 row in set (0.00 sec)
> ERROR:
> No query specified
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