Kevin Weiler schrieb:
Thanks Kyle,
What's the unit for osd recovery max chunk?
Have a look at
http://ceph.com/docs/master/rados/configuration/osd-config-ref/ where
all the possible OSD config options are described, especially have a
look at the backfilling and recovery sections.
Also, how do I find out what my current values are for these osd options?
Have a look at
http://ceph.com/docs/master/rados/configuration/ceph-conf/#viewing-a-configuration-at-runtime
Best regards,
Kurt
--
Kevin Weiler
IT
IMC Financial Markets | 233 S. Wacker Drive, Suite 4300 | Chicago, IL
60606 | http://imc-chicago.com/
Phone: +1 312-204-7439 | Fax: +1 312-244-3301 | E-Mail:
kevin.weiler@xxxxxxxxxxxxxxx
On 10/28/13 6:22 PM, "Kyle Bader" <kyle.bader@xxxxxxxxx> wrote:
You can change some OSD tunables to lower the priority of backfills:
osd recovery max chunk: 8388608
osd recovery op priority: 2
In general a lower op priority means it will take longer for your
placement groups to go from degraded to active+clean, the idea is to
balance recovery time and not starving client requests. I've found 2
to work well on our clusters, YMMV.
On Mon, Oct 28, 2013 at 10:16 AM, Kevin Weiler
<Kevin.Weiler@xxxxxxxxxxxxxxx> wrote:
Hi all,
We have a ceph cluster that being used as a backing store for several
VMs
(windows and linux). We notice that when we reboot a node, the cluster
enters a degraded state (which is expected), but when it begins to
recover,
it starts backfilling and it kills the performance of our VMs. The VMs
run
slow, or not at all, and also seem to switch it's ceph mounts to
read-only.
I was wondering 2 things:
Shouldn't we be recovering instead of backfilling? It seems like
backfilling
is much more intensive operation
Can we improve the recovery/backfill performance so that our VMs don't
go
down when there is a problem with the cluster?
--
Kevin Weiler
IT
IMC Financial Markets | 233 S. Wacker Drive, Suite 4300 | Chicago, IL
60606
| http://imc-chicago.com/
Phone: +1 312-204-7439 | Fax: +1 312-244-3301 | E-Mail:
kevin.weiler@xxxxxxxxxxxxxxx
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