Hi Wido,
This seems similar to what our dumpling tunables cluster does when a few particular osds go down... Though in our case the remapped pgs are correctly shown as remapped, not clean.
The fix in our case will be to enable the vary_r tunable (which will move some data).
Cheers, Dan
On 24 Oct 2016 22:19, "Wido den Hollander" <wido@xxxxxxxx> wrote:
>
> Hi,
>
> On a cluster running Hammer 0.94.9 (upgraded from Firefly) I have 29 remapped PGs according to the OSDMap, but all PGs are active+clean.
>
> osdmap e111208: 171 osds: 166 up, 166 in; 29 remapped pgs
>
> pgmap v101069070: 6144 pgs, 2 pools, 90122 GB data, 22787 kobjects
> 264 TB used, 184 TB / 448 TB avail
> 6144 active+clean
>
> The OSDMap shows:
>
> root@mon1:~# ceph osd dump|grep pg_temp
> pg_temp 4.39 [160,17,10,8]
> pg_temp 4.52 [161,16,10,11]
> pg_temp 4.8b [166,29,10,7]
> pg_temp 4.b1 [5,162,148,2]
> pg_temp 4.168 [95,59,6,2]
> pg_temp 4.1ef [22,162,10,5]
> pg_temp 4.2c9 [164,95,10,7]
> pg_temp 4.330 [165,154,10,8]
> pg_temp 4.353 [2,33,18,54]
> pg_temp 4.3f8 [88,67,10,7]
> pg_temp 4.41a [30,59,10,5]
> pg_temp 4.45f [47,156,21,2]
> pg_temp 4.486 [138,43,10,7]
> pg_temp 4.674 [59,18,7,2]
> pg_temp 4.7b8 [164,68,10,11]
> pg_temp 4.816 [167,147,57,2]
> pg_temp 4.829 [82,45,10,11]
> pg_temp 4.843 [141,34,10,6]
> pg_temp 4.862 [31,160,138,2]
> pg_temp 4.868 [78,67,10,5]
> pg_temp 4.9ca [150,68,10,8]
> pg_temp 4.a83 [156,83,10,7]
> pg_temp 4.a98 [161,94,10,7]
> pg_temp 4.b80 [162,88,10,8]
> pg_temp 4.d41 [163,52,10,6]
> pg_temp 4.d54 [149,140,10,7]
> pg_temp 4.e8e [164,78,10,8]
> pg_temp 4.f2a [150,68,10,6]
> pg_temp 4.ff3 [30,157,10,7]
> root@mon1:~#
>
> So I tried to restart osd.160 and osd.161, but that didn't chance the state.
>
> root@mon1:~# ceph pg 4.39 query
> {
> "state": "active+clean",
> "snap_trimq": "[]",
> "epoch": 111212,
> "up": [
> 160,
> 17,
> 8
> ],
> "acting": [
> 160,
> 17,
> 8
> ],
> "actingbackfill": [
> "8",
> "17",
> "160"
> ],
>
> In all these PGs osd.10 is involved, but that OSD is down and out. I tried marking it as down again, but that didn't work.
>
> I haven't tried removing osd.10 yet from the CRUSHMap since that will trigger a rather large rebalance.
>
> This cluster is still running with the Dumpling tunables though, so that might be the issue. But before I trigger a very large rebalance I wanted to check if there are any insights on this one.
>
> Thanks,
>
> Wido
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