[ovirt-users] ovirt-agent: is it possible to run specific actions when taking snapshots?

[Markus Stockhausen]

>From my experience I strongly advise to avoid a drop_caches
with option 3. We still see commands hanging for hours
if they are issued during high CPU/memory load. Even with
matured Ubuntu 3.16 kernels

Staying with option 1 should be enough and much more save.

Markus

________________________________
Von: users-bounces at ovirt.org [users-bounces at ovirt.org]" im Auftrag von "Yaniv Dary [ydary at redhat.com]
Gesendet: Sonntag, 17. Mai 2015 09:53
An: Ernest Beinrohr; users
Betreff: Re: [ovirt-users] ovirt-agent: is it possible to run specific actions when taking snapshots?


We use libvirt VIR_DOMAIN_SNAPSHOT_CREATE_QUIESCE flag, which uses guest agent to quiesce all mounted file systems within the domain.
The qemu guest agent implements fsfreeze/fsthaw commands, which do the quiescing.



On 05/12/2015 02:56 PM, Ernest Beinrohr wrote:
It would be nice, if ovirt snapshots were more safe. When a VM has the ovirt-agent installed, ovirt could tell the agent to run site-speficic actions. What I have in mind is:

linux vms:
- sync
- echo 3 > /proc/sys/vm/drop_caches
- zerofill empty space (this takes long but saves precious backup space)

databases:
- prepare databases for snapshot (flush,write-lock)
- send snapshot-complete and unlock


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Yaniv Dary
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