Details
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Bug
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Status: Resolved
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Critical
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Resolution: Fixed
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4.10.0.0, 4.9.2.0, 4.5.2.2, 4.9.3.0
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Security Level: Public (Anyone can view this level - this is the default.)
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None
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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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