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-boun...@ovirt.org [users-boun...@ovirt.org] im Auftrag von Yaniv
Dary [yd...@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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Red Hat Israel Ltd.
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Tel : +972 (9) 7692306
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Email: yd...@redhat.commailto:yd...@redhat.com
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