25 Apr
2020
25 Apr
'20
11:53 a.m.
This sounds very familiar. I recently bumped the of number of PGs on one of our pools
from 1k to 8k and it's been rebalancing for weeks. From the standard tools it looks
like all the PGs are allocated and running but it keeps floating at 5% misplaced. I
finally found where it reports where it is status wise.
[pfmeec@scruffy ~]$ ceph osd pool get cold-ec all
~snip~
pg_num: 8192
pgp_num: 1982
~snip~
Whatever is increasing the PGs in the background won't let it go over 5% misplaced so
it's slowly creeping up the pgp. Ceph status and our dashboard just show constant
rebalance and a slowly oscillating misplaced object counter.
Check your pools using what I used above and see if you have something similar going on.
It hasn't bugged me enough to try and find that 5% knob but perhaps I should. It
would also be really nice to have an overall status that I don't need to dig for..
-paul
--
Paul Mezzanini
Sr Systems Administrator / Engineer, Research Computing
Information & Technology Services
Finance & Administration
Rochester Institute of Technology
o:(585) 475-3245 | pfmeec(a)rit.edu
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________________________________
From: Kyriazis, George <george.kyriazis(a)intel.com>
Sent: Friday, April 24, 2020 3:05:44 PM
To: Eugen Block <eblock(a)nde.ag>
Cc: ceph-users <ceph-users(a)ceph.io>
Subject: [ceph-users] Re: active+remapped+backfilling keeps going .. and going
pg_autoscalar is on, but the number of PGs are stable. I’ve seen subsequent calls to
“ceph -s” list the same number of total PGs, but PGs remapped+backfilling increased.
I haven’t seen anything in the logs, but perhaps I’m not looking at the right place. Any
place in particular I should be looking?
Thanks!
George
# ceph -s
cluster:
id: ec2c9542-dc1b-4af6-9f21-0adbcabb9452
health: HEALTH_WARN
603 pgs not deep-scrubbed in time
603 pgs not scrubbed in time
2 daemons have recently crashed
services:
mon: 5 daemons, quorum vis-ivb-07,vis-ivb-10,vis-hsw-01,vis-clx-01,vis-clx-05 (age
2h)
mgr: vis-ivb-07(active, since 2h), standbys: vis-hsw-01, vis-ivb-10, vis-clx-01,
vis-clx-05
mds: cephfs:1 {0=vis-hsw-01=up:active} 2 up:standby
osd: 15 osds: 15 up (since 2d), 15 in (since 8d); 100 remapped pgs
data:
pools: 5 pools, 608 pgs
objects: 46.32M objects, 49 TiB
usage: 129 TiB used, 75 TiB / 204 TiB avail
pgs: 8985854/172482064 objects misplaced (5.210%)
508 active+clean
100 active+remapped+backfilling
io:
client: 102 KiB/s wr, 0 op/s rd, 4 op/s wr
recovery: 117 MiB/s, 86 objects/s
# ceph -s
cluster:
id: ec2c9542-dc1b-4af6-9f21-0adbcabb9452
health: HEALTH_WARN
603 pgs not deep-scrubbed in time
603 pgs not scrubbed in time
2 daemons have recently crashed
services:
mon: 5 daemons, quorum vis-ivb-07,vis-ivb-10,vis-hsw-01,vis-clx-01,vis-clx-05 (age
5h)
mgr: vis-ivb-07(active, since 5h), standbys: vis-hsw-01, vis-ivb-10, vis-clx-01,
vis-clx-05
mds: cephfs:1 {0=vis-hsw-01=up:active} 2 up:standby
osd: 15 osds: 15 up (since 2d), 15 in (since 8d); 103 remapped pgs
data:
pools: 5 pools, 608 pgs
objects: 46.32M objects, 49 TiB
usage: 128 TiB used, 75 TiB / 204 TiB avail
pgs: 8681394/172482064 objects misplaced (5.033%)
505 active+clean
103 active+remapped+backfilling
io:
recovery: 70 MiB/s, 54 objects/s
#
On Apr 24, 2020, at 1:52 PM, Eugen Block <eblock@nde.ag<mailto:eblock@nde.ag>>
wrote:
Yes, that means it's off. Can you see anything in the logs? They should show that
something triggers the rebalancing. Could it be the pg_autoscaler? Is that enabled?
Zitat von "Kyriazis, George"
<george.kyriazis@intel.com<mailto:george.kyriazis@intel.com>>:
Here is the status of my balancer:
# ceph balancer status
{
"last_optimize_duration": "",
"plans": [],
"mode": "none",
"active": false,
"optimize_result": "",
"last_optimize_started": ""
}
#
Doesn’t that mean it’s “off”?
Thanks,
George
On Apr 24, 2020, at 1:49 AM, Lomayani S. Laizer
<lomlaizer@gmail.com<mailto:lomlaizer@gmail.com><mailto:lomlaizer@gmail.com>>
wrote:
I had a similar problem when upgraded to octopus and the solution is to turn off
autobalancing.
You can try to turn off if enabled
ceph balancer off
On Fri, Apr 24, 2020 at 8:51 AM Eugen Block
<eblock@nde.ag<mailto:eblock@nde.ag><mailto:eblock@nde.ag>> wrote:
Hi,
the balancer is probably running, which mode? I changed the mode to
none in our own cluster because it also never finished rebalancing and
we didn’t have a bad pg distribution. Maybe it’s supposed to be like
that, I don’t know.
Regards
Eugen
Zitat von "Kyriazis, George"
<george.kyriazis@intel.com<mailto:george.kyriazis@intel.com><mailto:george.kyriazis@intel.com>>:
Hello,
I have a Proxmox ceph cluster with 5 nodes and 3 OSDs each (total 15
OSDs), on a 10G network.
The cluster started small, and I’ve progressively added OSDs over
time. Problem is…. The cluster never rebalances completely. There
is always progress on backfilling, but PGs that used to be in
active+clean state jump back into the active+remapped+backfilling
(or active+remapped+backfill_wait) state, to be moved to different
OSDs.
Initially I had a 1G network (recently upgraded to 10G), and I was
holding on the backfill settings (osd_max_backfills and
osd_recovery_sleep_hdd). I just recently (last few weeks) upgraded
to 10G, with osd_max_backfills = 50 and osd_recovery_sleep_hdd = 0
(only HDDs, no SSDs). Cluster has been backfilling for months now
with no end in sight.
Is this normal behavior? Is there any setting that I can look at
that till give me an idea as to why PGs are jumping back into
remapped from clean?
Below is output of “ceph osd tree” and “ceph osd df”:
# ceph osd tree
ID CLASS WEIGHT TYPE NAME STATUS REWEIGHT PRI-AFF
-1 203.72472 root default
-9 40.01666 host vis-hsw-01
3 hdd 10.91309 osd.3 up 1.00000 1.00000
6 hdd 14.55179 osd.6 up 1.00000 1.00000
10 hdd 14.55179 osd.10 up 1.00000 1.00000
-13 40.01666 host vis-hsw-02
0 hdd 10.91309 osd.0 up 1.00000 1.00000
7 hdd 14.55179 osd.7 up 1.00000 1.00000
11 hdd 14.55179 osd.11 up 1.00000 1.00000
-11 40.01666 host vis-hsw-03
4 hdd 10.91309 osd.4 up 1.00000 1.00000
8 hdd 14.55179 osd.8 up 1.00000 1.00000
12 hdd 14.55179 osd.12 up 1.00000 1.00000
-3 40.01666 host vis-hsw-04
5 hdd 10.91309 osd.5 up 1.00000 1.00000
9 hdd 14.55179 osd.9 up 1.00000 1.00000
13 hdd 14.55179 osd.13 up 1.00000 1.00000
-15 43.65807 host vis-hsw-05
1 hdd 14.55269 osd.1 up 1.00000 1.00000
2 hdd 14.55269 osd.2 up 1.00000 1.00000
14 hdd 14.55269 osd.14 up 1.00000 1.00000
-5 0 host vis-ivb-07
-7 0 host vis-ivb-10
#
# ceph osd df
ID CLASS WEIGHT REWEIGHT SIZE RAW USE DATA OMAP META
AVAIL %USE VAR PGS STATUS
3 hdd 10.91309 1.00000 11 TiB 8.2 TiB 8.2 TiB 552 MiB 25 GiB
2.7 TiB 75.08 1.19 131 up
6 hdd 14.55179 1.00000 15 TiB 9.1 TiB 9.1 TiB 1.2 GiB 30 GiB
5.5 TiB 62.47 0.99 148 up
10 hdd 14.55179 1.00000 15 TiB 8.1 TiB 8.1 TiB 1.5 GiB 20 GiB
6.4 TiB 55.98 0.89 142 up
0 hdd 10.91309 1.00000 11 TiB 7.5 TiB 7.4 TiB 504 MiB 24 GiB
3.5 TiB 68.34 1.09 120 up
7 hdd 14.55179 1.00000 15 TiB 8.7 TiB 8.7 TiB 1.0 GiB 31 GiB
5.8 TiB 60.07 0.95 144 up
11 hdd 14.55179 1.00000 15 TiB 9.4 TiB 9.3 TiB 819 MiB 20 GiB
5.2 TiB 64.31 1.02 147 up
4 hdd 10.91309 1.00000 11 TiB 7.0 TiB 7.0 TiB 284 MiB 25 GiB
3.9 TiB 64.35 1.02 112 up
8 hdd 14.55179 1.00000 15 TiB 9.3 TiB 9.2 TiB 1.8 GiB 29 GiB
5.3 TiB 63.65 1.01 157 up
12 hdd 14.55179 1.00000 15 TiB 8.6 TiB 8.6 TiB 623 MiB 19 GiB
5.9 TiB 59.14 0.94 136 up
5 hdd 10.91309 1.00000 11 TiB 8.6 TiB 8.6 TiB 542 MiB 29 GiB
2.3 TiB 79.01 1.26 134 up
9 hdd 14.55179 1.00000 15 TiB 8.2 TiB 8.2 TiB 707 MiB 27 GiB
6.3 TiB 56.56 0.90 138 up
13 hdd 14.55179 1.00000 15 TiB 8.7 TiB 8.7 TiB 741 MiB 18 GiB
5.8 TiB 59.85 0.95 134 up
1 hdd 14.55269 1.00000 15 TiB 9.8 TiB 9.8 TiB 1.3 GiB 20 GiB
4.8 TiB 67.18 1.07 158 up
2 hdd 14.55269 1.00000 15 TiB 8.7 TiB 8.7 TiB 936 MiB 18 GiB
5.8 TiB 60.04 0.95 148 up
14 hdd 14.55269 1.00000 15 TiB 8.3 TiB 8.3 TiB 673 MiB 18 GiB
6.3 TiB 56.97 0.90 131 up
TOTAL 204 TiB 128 TiB 128 TiB 13 GiB 350 GiB
75 TiB 62.95
MIN/MAX VAR: 0.89/1.26 STDDEV: 6.44
#
Thank you!
George
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