Hi. Please note that I am performing most operations using XenCenter 6.
When taking a snapshot and checking the quiesced box, the snapshot takes
forever, eventually fails and while it is running, I get the following errors in
/var/log/messages on the XCP host:
Mar 24 15:54:45 xenserver-bnfnijur HVM79[7822]: XENVBD Notice RescanThread:
scanning targets...
Mar 24 15:54:45 xenserver-bnfnijur HVM79[7822]: XENVBD Notice
XenbusFindVbds: ignoring cdrom (VBD 5696)
Mar 24 15:54:45 xenserver-bnfnijur HVM79[7822]: XENVBD Notice
__XenvbdScanTargets: target 0 -> device/vbd/768
Mar 24 15:54:45 xenserver-bnfnijur HVM79[7822]: XENVBD Notice
__XenvbdScanTargets: target 1 -> device/vbd/832
Mar 24 11:54:45 xenserver-bnfnijur vbd.uevent[add](backend/vbd/79/832): wrote
/xapi/79/hotplug/vbd/832/hotplug = ''online''
Mar 24 11:54:46 xenserver-bnfnijur fe: 10158
(/opt/xensource/xha/ha_query_liveset) exitted with code 0
Mar 24 15:54:51 xenserver-bnfnijur HVM79[7822]: XENVBD Notice
DeviceRelationsFdo: scanning targets...
Mar 24 15:54:51 xenserver-bnfnijur HVM79[7822]: XENVBD Notice
XenbusFindVbds: ignoring cdrom (VBD 5696)
Mar 24 15:54:51 xenserver-bnfnijur HVM79[7822]: XENVBD Notice
__XenvbdScanTargets: target 0 -> device/vbd/768
Mar 24 15:54:51 xenserver-bnfnijur HVM79[7822]: XENVBD Notice
__XenvbdScanTargets: target 1 -> device/vbd/832
Mar 24 11:55:02 xenserver-bnfnijur tapdisk[10137]: ERROR: errno -28 at
vhd_complete:
/dev/VG_XenStorage-3ee08436-2a81-cdda-f62a-291e67b517f8/VHD-dc8e12e3-b74f-427a-a59e-d934c0d8c33a:
op: 5, lsec: 6160384, secs: 8, nbytes: 4096, blk: 1504, blk_offset: 4294967295
Mar 24 11:55:02 xenserver-bnfnijur tapdisk[10137]: ERROR: errno -28 at
vhd_complete:
/dev/VG_XenStorage-3ee08436-2a81-cdda-f62a-291e67b517f8/VHD-dc8e12e3-b74f-427a-a59e-d934c0d8c33a:
op: 2, lsec: 6162424, secs: 8, nbytes: 4096, blk: 1504, blk_offset: 4294967295
Mar 24 11:55:02 xenserver-bnfnijur tapdisk[10137]: ERROR: errno -28 at
__tapdisk_vbd_complete_td_request: req 0: write 0x0008 secs to 0x005e07f8
Mar 24 11:55:03 xenserver-bnfnijur tapdisk[10137]: ERROR: errno -28 at
vhd_complete:
/dev/VG_XenStorage-3ee08436-2a81-cdda-f62a-291e67b517f8/VHD-dc8e12e3-b74f-427a-a59e-d934c0d8c33a:
op: 5, lsec: 6160384, secs: 8, nbytes: 4096, blk: 1504, blk_offset: 4294967295
Mar 24 11:55:03 xenserver-bnfnijur tapdisk[10137]: ERROR: errno -28 at
vhd_complete:
/dev/VG_XenStorage-3ee08436-2a81-cdda-f62a-291e67b517f8/VHD-dc8e12e3-b74f-427a-a59e-d934c0d8c33a:
op: 2, lsec: 6162424, secs: 8, nbytes: 4096, blk: 1504, blk_offset: 4294967295
[SNIP]..
Dmesg also reports i/o errors errors to the tap:
end_request: I/O error, dev tdf, sector 6162424
end_request: I/O error, dev tdf, sector 6162424
I have the Citrix Tools installed as well as the VSS provider for Citrix.
The funky thing that I observe is that the snapshot gets added as a disk to the
VM. I''m unable to remove it and my only option is to deactivate it.
After deactivating it, I can do xe snapshot-list and no snapshots are listed,but
if I view the SR, I can clearly see that it''s still here shown as
"0% on disk" If I do a xe vdi-list, I can see two disks with the same
name-label though. For example:
[root@xenserver-bnfnijur ~]# xe vdi-list name-label=VS2025_Disk0
uuid ( RO) : 47d8d6de-a61c-4e1c-a708-014d9d08aa80
name-label ( RW): VS2025_Disk0
name-description ( RW): Disk 0 for VS2025
sr-uuid ( RO): 3ee08436-2a81-cdda-f62a-291e67b517f8
virtual-size ( RO): 80002154496
sharable ( RO): false
read-only ( RO): false
uuid ( RO) : dc8e12e3-b74f-427a-a59e-d934c0d8c33a
name-label ( RW): VS2025_Disk0
name-description ( RW): Disk 0 for VS2025
sr-uuid ( RO): 3ee08436-2a81-cdda-f62a-291e67b517f8
virtual-size ( RO): 80002154496
sharable ( RO): false
read-only ( RO): false
The only way I''ve been able to restore things to a normal state is to
actually destroy the VM.
Any thoughts?