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  1. CloudStack
  2. CLOUDSTACK-10128

Template from snapshot not merging vhd files

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Details

    • Bug
    • Status: Resolved
    • Critical
    • Resolution: Fixed
    • 4.10.0.0, 4.9.2.0, 4.5.2.2, 4.9.3.0
    • 4.11.0.0
    • Management Server
    • Security Level: Public (Anyone can view this level - this is the default.)
    • None
    • Production environment running ACS 4.5.2.2, 4.9.2.0, 4.9.3.0
      XenServer 6.5
      Primary Storage NFS and ISCSI
      Fresh install running 4.5.2.2, 4.9.2.0, 4.9.3.0 and 4.10

    Description

      If we have two or more snapshots of a ROOT disk and try to create a template from differencial snapshots, CloudStack not merging the vhd files on secondary storage.

      Steps to reproduce

      1. Create virtual machine - OK

      2. Create a manual snapshot from ROOT volume - OK
      The vhd of first snapshot (snapshot-base) is stored on secondary storage correctly

      [root@acs01 6]# ls -l /exports/secondary/snapshots/2/6/011a7650-a13f-4332-8c72-2428a002affc.vhd
      rw-rr- 1 root root 1767191040 Nov 1 12:12 /exports/secondary/snapshots/2/6/011a7650-a13f-4332-8c72-2428a002affc.vhd

      [root@acs01 6]# md5sum /exports/secondary/snapshots/2/6/011a7650-a13f-4332-8c72-2428a002affc.vhd
      240e5e424552d44b5d297895b064beee /exports/secondary/snapshots/2/6/011a7650-a13f-4332-8c72-2428a002affc.vhd

      3. Create a template from snapshot-base - OK

      [root@acs01 6]# ls -l /exports/secondary/template/tmpl/2/206/be3311d9-8e59-4240-968d-73d7a6eecfdd.vhd
      rw-rr- 1 root root 1767191040 Nov 1 12:17 /exports/secondary/template/tmpl/2/206/be3311d9-8e59-4240-968d-73d7a6eecfdd.vhd

      [root@acs01 6]# md5sum /exports/secondary/template/tmpl/2/206/be3311d9-8e59-4240-968d-73d7a6eecfdd.vhd
      240e5e424552d44b5d297895b064beee /exports/secondary/template/tmpl/2/206/be3311d9-8e59-4240-968d-73d7a6eecfdd.vhd

      This template from snapshot-base boot normally

      4. Create new file (1GB) on ROOT volume

      5. Create new snapshot (snapshot-diff) from ROOT volume - OK

      [root@acs01 6]# ls -l /exports/secondary/snapshots/2/6/
      total 2840056
      rw-rr- 1 root root 1767191040 Nov 1 12:12 011a7650-a13f-4332-8c72-2428a002affc.vhd <- snapshot-base
      rw-rr- 1 root root 1141019136 Nov 1 12:21 1503adaa-4f6e-4f9c-8d80-68663baa86b8.vhd <- snapshot-diff

      6. Create a template from second snapshot - NOK

      [root@acs01 6]# ls -lh /exports/secondary/template/tmpl/2/207/4c5c51a1-fcb4-4cc8-8f97-1664a63af262.vhd
      rw-rr- 1 root root 1141019136 Nov 1 12:30 /exports/secondary/template/tmpl/2/207/4c5c51a1-fcb4-4cc8-8f97-1664a63af262.vhd

      CloudStack not merging snapshot-base and snapshot-diff. Template from second snapshot is corrupted because is based just on differential vhd.

      Volume from snapshot work very well

      1. Create a volume from snapshot-diff - OK
      CloudStack merge two snapshots in one file

      [root@acs01 primary]# ls -l /exports/primary/70f1db23-cc59-4ec7-b8d4-ed036228593b.vhd
      rw-rr- 1 root root 2843030016 Nov 1 12:34 /exports/primary/70f1db23-cc59-4ec7-b8d4-ed036228593b.vhd

      2. Download the new volume to check vhd on secondary storage

      [root@acs01 9]# ls -l /exports/secondary/volumes/2/9/ec6e0f65-bb71-4c91-bac3-287cde2106b7.vhd
      rw-rr- 1 root root 2843030016 Nov 1 12:35 /exports/secondary/volumes/2/9/ec6e0f65-bb71-4c91-bac3-287cde2106b7.vhd

      We test on 4.5.2.2, 4.9.2.0, 4.9.3.0 and 4.10. XenServer 6.5 with SP1 and XenServer 6.5 with all patches.

      A workaround is create a volume (data-disk) from latest snapshot, create new snapshot from data-disk and convert to template.

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            rafaelweingartner Rafael Weingärtner
            lotic Marcelo Lima
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