[ovirt-users] oVirt VM backup and restore

[Gianluca Cecchi]

On Thu, Mar 9, 2017 at 12:11 PM, Maton, Brett <matonb at ltresources.co.uk>
wrote:

> Good point
>
>
>> Just wanted to add that freezing activity is not only important for
>> databases, but also for plain file systems. In order to do a consistent
>> backup it is important to freeze the file systems before creating a live
>> snapshot, and thaw it afterwards. oVirt does that automatically, but
>> only if the guest agent is installed and running. So, remember to have
>> the guest agent installed and running in the virtual machines that you
>> plan to backup using this mechanism.
>>
>>
>> _______________________________________________
>> Users mailing list
>> Users at ovirt.org
>> http://lists.ovirt.org/mailman/listinfo/users
>>
>
>
Yes, indeed.
I forgot to write it before, but I did verify that my VM with guest agent
installed had this inside its /var/log/messages file:

Mar  9 10:49:36 T-ORACLE73 qemu-ga: info: guest-fsfreeze called
Mar  9 10:49:36 T-ORACLE73 qemu-ga: info: executing fsfreeze hook with arg
'freeze'
Mar  9 10:49:37 T-ORACLE73 qemu-ga: info: executing fsfreeze hook with arg
'thaw'

Also, with vm_backup.py utility, I verified that inside the VM where the
snapshotted disk was attached (c7testovn1), I got this:

Mar  9 10:49:42 c7testovn1 kernel: pci 0000:00:09.0: BAR 4: assigned [mem
0x40000000-0x40003fff 64bit pref]
Mar  9 10:49:42 c7testovn1 kernel: pci 0000:00:09.0: BAR 1: assigned [mem
0x40004000-0x40004fff]
Mar  9 10:49:42 c7testovn1 kernel: pci 0000:00:09.0: BAR 0: assigned [io
 0x1000-0x103f]
Mar  9 10:49:42 c7testovn1 kernel: virtio-pci 0000:00:09.0: enabling device
(0000 -> 0003)
Mar  9 10:49:42 c7testovn1 kernel: vdb: vdb1 vdb2
Mar  9 10:49:42 c7testovn1 systemd: Starting LVM2 PV scan on device
252:18...
Mar  9 10:49:42 c7testovn1 lvm: 2 logical volume(s) in volume group
"mainvg" now active
Mar  9 10:49:42 c7testovn1 systemd: Started LVM2 PV scan on device 252:18.
Mar  9 10:49:44 c7testovn1 systemd: Stopping LVM2 PV scan on device
252:18...
Mar  9 10:49:44 c7testovn1 lvm: Device 252:18 not found. Cleared from
lvmetad cache.
Mar  9 10:49:44 c7testovn1 systemd: Stopped LVM2 PV scan on device 252:18.

Gianluca
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