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From "Mike Tutkowski (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CLOUDSTACK-6514) VMware: Is space allocated for snapshots counted correctly?
Date Fri, 25 Apr 2014 20:10:15 GMT
Mike Tutkowski created CLOUDSTACK-6514:
------------------------------------------

             Summary: VMware: Is space allocated for snapshots counted correctly?
                 Key: CLOUDSTACK-6514
                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-6514
             Project: CloudStack
          Issue Type: Bug
      Security Level: Public (Anyone can view this level - this is the default.)
          Components: VMware
    Affects Versions: 4.4.0
         Environment: Ubuntu 12.04 for CloudStack Management Server (just one in this config)
Two ESXi 5.1 hosts
            Reporter: Mike Tutkowski
             Fix For: 4.4.0


long CapacityManager.getAllocatedPoolCapacity(StoragePoolVO, VMTemplateVO) may not add up
allocated space in the passed-in storage pool properly for VMware.

The idea is to count the allocated space of all non-destroyed volumes and the corresponding
allocated space of their snapshots, if any. In addition, templates on the storage pool should
be taken into consideration.

I think the number that is in the vm_snapshot_chain_size column of the volumes table is not
correctly calculated (and this number is used by the getAllocatedPoolCapacity method when
it invokes another method).

This is how it currently works when you have a new VM and you take a snapshot of it for the
first time (not taking a snapshot of memory):

These are the relevant files and their respective sizes:

ROOT-21-000001-delta.vmdk (16,785,408 bytes)
ROOT-21-000001.vmdk (316 bytes)
ROOT-21-flat.vmdk (2,147,483,648 bytes)
ROOT-21.vmdk (515 bytes)
i-2-21-VM-Snapshot1.vmsn (28,310 bytes)

We include these files for the vm_snapshot_chain_size:

ROOT-21-flat.vmdk (2,147,483,648 bytes)
ROOT-21.vmdk (515 bytes)
i-2-21-VM-Snapshot1.vmsn (28,310 bytes)

I think we should be counting these instead:

ROOT-21-000001-delta.vmdk (16,785,408 bytes)
ROOT-21-000001.vmdk (316 bytes)
i-2-21-VM-Snapshot1.vmsn (28,310 bytes)

My thinking is that when we add up the total space that this volume consumes that we've already
taking into account 2,147,483,648 bytes because this value is stored in the size column of
the volumes table.

I would think we'd want to add up the sizes of the VMSN files and the sizes of the -xxxxxx
files to arrive at vm_snapshot_chain_size?

Any thoughts on this?

Thanks!



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