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  1. CloudStack
  2. CLOUDSTACK-8939

VM Snapshot size with memory is not correctly calculated in cloud.usage_event (XenServer)

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    Details

    • Type: Bug
    • Status: Open
    • Priority: Major
    • Resolution: Unresolved
    • Affects Version/s: 4.5.2
    • Fix Version/s: None
    • Component/s: None
    • Security Level: Public (Anyone can view this level - this is the default.)
    • Labels:
      None

      Description

      1. created a VM snapshot with memory on a VM with 512 MB RAM
      list all the VBDs for the VM
      xe vbd-list vm-name-label=i-2-43-VM empty=false params=vdi-uuid
      vdi-uuid ( RO) : fbe638dd-02c5-42f5-96b2-7b3d73e68658
      Verify the size of the snapshot disk and its parent (I understand from the code we only check one parent in the chain)

      1. xe vdi-list params=physical-utilisation,sm-config,is-a-snapshot uuid=fbe638dd-02c5-42f5-96b2-7b3d73e68658
        is-a-snapshot ( RO) : false
        physical-utilisation ( RO): 38124032 <-------------
        sm-config (MRO): host_OpaqueRef:52c1ec01-cef6-d4fd-7d81-68795a853ee0: RW; vhd-parent: 993e3859-8be9-414c-819b-61095ab2eff1
        parent:
      2. xe vdi-list params=physical-utilisation,sm-config,is-a-snapshot uuid=993e3859-8be9-414c-819b-61095ab2eff1
        is-a-snapshot ( RO) : false
        physical-utilisation ( RO): 119816704 <-------------
        sm-config (MRO): vhd-blocks: eJxrYAAB0QcMWAELduFBDwSgNAsaHxcQARGMNHMOQfsJARFGRgkGRkWgOxmxGiWCwz5c9qLLU+o+YoGooIBUp6CgIJ2sIxnQKxzoZQ8M0Dof09s/1AMALcYD3A==; vhd-parent: 4b7ee66c-de53-47bb-b3d5-306d40a0ea08
        At this stage, not counting the "suspend VDI", the size looks as follows:
        38124032 + 119816704 = 157940736 = 150.6 MB
        Now, let's calulate the "suspend VDI" size and add it to the above value:
        Note my test VM has 512 MB of RAM
      3. xe vdi-list name-label=Suspend\ image params=all

      uuid ( RO) : e2ae7a47-c410-479b-9e2b-5f05c01f1b4f
      name-label ( RW): Suspend image
      name-description ( RW): Suspend image
      is-a-snapshot ( RO): true
      physical-utilisation ( RO): 6144 <---------------------------------------
      sm-config (MRO): vhd-parent: c286583b-dd47-4a21-a5fe-ba2f671f1163
      Looking at the parent

      1. xe vdi-list uuid=c286583b-dd47-4a21-a5fe-ba2f671f1163 params=all

      uuid ( RO) : c286583b-dd47-4a21-a5fe-ba2f671f1163
      name-label ( RW): base copy
      is-a-snapshot ( RO): false
      virtual-size ( RO): 782237696
      physical-utilisation ( RO): 252154368 <---------------------------------------
      sm-config (MRO): vhd-blocks: eJz7/x8ZNDA0MEDAASiNyucAAHMeEPs=

      So the "suspend VDI" + its parent has "physical utilisation" of 6144 + 252154368 = 252160512 = 17.55 MB
      Now, if we add it to the previously calculated disk sizes, we'll get:
      xapi (phys util): 157940736 (non-memory snap disks)+ 252160512 (memory snap disks) = 410101248 = 391.1 MB
      Let's verify the size in cloud.usage_event now:
      select * from cloud.usage_event where resource_name like "i-2-43-VM%" \G

      id: 528
      type: VMSNAPSHOT.CREATE
      account_id: 2
      created: 2015-04-14 11:48:56
      zone_id: 1
      resource_id: 43
      resource_name: i-2-43-VM_VS_20150414114830
      offering_id: NULL
      template_id: 64
      size: 119863296 <-------------
      resource_type: NULL
      processed: 0
      virtual_size: NULL
      1 row in set (0.01 sec)
      Overall, the snapshot size in cloud.usage_event != size calculated from xapi objects based on the code
      xapi (phys util): 157940736 (non-memory snap disks)+ 252160512 (memory snap disks) = 410101248 = 391.1 MB
      but:
      usage_event: 119863296 = 114.3 MB

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              • Assignee:
                Unassigned
                Reporter:
                yvsubhash subhash yedugundla
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                Dates

                • Created:
                  Updated: