[ovirt-users] Deleting large snapshots blocks the whole cluster

Stefan Wendler stefan.wendler at tngtech.com
Mon Oct 27 10:39:24 UTC 2014


do you mean during snapshot deletion or in general?

In general we do not have any swap usage at all. On none of the 4 hosts.

We had some swap I/O on the host that is SPM most of the time. But not
during that period where we tried to delete the snapshot.


On 10/27/14 11:08, Markus Stockhausen wrote:
> Do you see swapping on the SPM? If yes a regular echo 3 > drop_caches could help.
> Markus
> Am 27.10.2014 10:57 schrieb Stefan Wendler <stefan.wendler at tngtech.com>:
> Hi,
> we have some really large snapshots left from a migration. Since our
> store is almost full now we have to delete them now.
> Some snapshots are around 1TB already.
> The last time we tried to delete a ~500GB snapshot the delete task
> blocked the whole diskstore's IO and the whole cluster and all hosts
> became unavailable.
> Is there a way to delete large snapshots in a "humane" way that will not
> block everything?
> Cheers,
> Stefan

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