On Tue, 4 Jun 2013, YIP Wai Peng wrote:
> Sorry, to set things in context, I had some other problems last weekend.
> Setting it to optimal tunables helped (although I am on the older kernel).
> Since it worked, I was inclined to believed that the tunables do work on the
> older kernel.
> That being said, I will upgrade the kernel to see if this issue goes away.
The kernel version is only an issue if you are using the cephfs or rbd
*client* from the kernel (e.g., rbd map ... or mount -t ceph ...). (Ceph
didn't appear upstream until 2.6.35 or thereabouts, and fixes are only
backported as far as v3.4.)
sage
>
> Regards,
> Wai Peng
>
>
> On Tue, Jun 4, 2013 at 12:01 PM, YIP Wai Peng <yipwp@xxxxxxxxxxxxxxx> wrote:
> Hi Sage,
> It is on optimal tunables already. However, I'm on kernel
> 2.6.32-358.6.2.el6.x86_64. Will the tunables take effect or do I have
> to upgrade to something newer?
>
> - WP
>
>
> On Tue, Jun 4, 2013 at 11:58 AM, Sage Weil <sage@xxxxxxxxxxx> wrote:
> On Tue, 4 Jun 2013, YIP Wai Peng wrote:
> > Hi all,
> > I'm running ceph on CentOS6 on 3 hosts, with 3 OSD each
> (total 9 OSD).
> > When I increased one of my pool rep size from 2 to 3,
> just 6 PGs will get
> > stuck in active+clean+degraded mode, but it doesn't
> create new replicas.
>
> My first guess is that you do not have the newer crush tunables
> set and
> some placements are not quite right. If you are prepared for
> some data
> migration, and are not using an older kernel client, try
>
> ceph osd crush tunables optimal
>
> sage
>
>
> >
> > One of the problematic PG has the following (snipped for
> brevity)
> >
> > { "state": "active+clean+degraded",
> > "epoch": 1329,
> > "up": [
> > 4,
> > 6],
> > "acting": [
> > 4,
> > 6],
> > <snip>
> > "recovery_state": [
> > { "name": "Started\/Primary\/Active",
> > "enter_time": "2013-06-04 01:10:30.092977",
> > "might_have_unfound": [
> > { "osd": 3,
> > "status": "already probed"},
> > { "osd": 5,
> > "status": "not queried"},
> > { "osd": 6,
> > "status": "already probed"}],
> > <snip>
> >
> >
> > I tried force_create_pg but it gets stuck in "creating". Any
> ideas on how to
> > "kickstart" this node to create the correct numbers of
> replicas?
> >
> >
> > PS: I have the following crush rule for the pool, which makes
> the replicas
> > go to different hosts.
> > host1 has OSD 0,1,2
> > host2 has OSD 3,4,5
> > host3 has OSD 6,7,8
> > Looking at it, the new replica should be going to OSD 0,1,2,
> but ceph is not
> > creating it?
> >
> > rule different_host {
> > ruleset 3
> > type replicated
> > min_size 1
> > max_size 10
> > step take default
> > step chooseleaf firstn 0 type host
> > step emit
> > }
> >
> >
> > Any help will be much appreciated. Cheers
> > - Wai Peng
> >
> >
>
>
>
>
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