Thanks for the tip, David. I've marked osd.21 down and out and will wait for recovery. I've never had success manually manipulating the OSD contents - I assume I can achieve the same result by removing osd.21 from the CRUSH map, "ceph osd rm 21", then recreating it from scratch as though I'd lost a disk?
-Aaron
On Fri, Aug 28, 2015 at 11:17 AM, David Zafman <dzafman@xxxxxxxxxx> wrote:
Without my latest branch which hasn't merged yet, you can't repair an EC pg in the situation that the shard with a bad checksum is in the first k chunks.
A way to fix it would be to take that osd down/out and let recovery regenerate the chunk. Remove the pg from the osd (ceph-objectstore-tool) and then you can bring the osd back up/in.
David
On 8/28/15 11:06 AM, Samuel Just wrote:
David, does this look familiar?
-Sam
On Fri, Aug 28, 2015 at 10:43 AM, Aaron Ten Clay <aarontc@xxxxxxxxxxx> wrote:
Hi Cephers,
I'm trying to resolve an inconsistent pg on an erasure-coded pool, running
Ceph 9.0.2. I can't seem to get Ceph to run a repair or even deep-scrub the
pg again. Here's the background, with my attempted resolution steps below.
Hopefully someone can steer me in the right direction. Thanks in advance!
Current state:
# ceph health detail
HEALTH_ERR 1 pgs inconsistent; 1 scrub errors; noout flag(s) set
pg 2.36 is active+clean+inconsistent, acting
[1,21,12,9,0,10,14,7,18,20,5,4,22,16]
1 scrub errors
noout flag(s) set
I started by looking at the log file for osd.1, where I found the cause of
the inconsistent report:
2015-08-24 00:43:10.391621 7f09fcff9700 0 log_channel(cluster) log [INF] :
2.36 deep-scrub starts
2015-08-24 01:54:59.933532 7f09fcff9700 -1 log_channel(cluster) log [ERR] :
2.36s0 shard 21(1): soid 576340b6/10000005990.00000199/head//2 candidate had
a read error
2015-08-24 02:34:41.380740 7f09fcff9700 -1 log_channel(cluster) log [ERR] :
2.36s0 deep-scrub 0 missing, 1 inconsistent objects
2015-08-24 02:34:41.380757 7f09fcff9700 -1 log_channel(cluster) log [ERR] :
2.36 deep-scrub 1 errors
I checked osd.21, where this report appears:
2015-08-24 01:54:56.477020 7f707cbd4700 0 osd.21 pg_epoch: 31958 pg[2.36s1(
v 31957'43013 (7132'39997,31957'43013] local-les=31951 n=34556 ec=136 les/c
31951/31954 31945/31945/31924) [1,21,12,9,0,10,14,7,18,20,5,4,22,16] r=1
lpr=31945 pi=1131-31944/7827 luod=0'0 crt=31957'43011 active] _scan_list
576340b6/10000005990.00000199/head//2 got incorrect hash on read
So, based upon the ceph documentation, I thought I could repair the pg by
executing "ceph pg repair 2.36". When I run this, while watching the mon
log, I see the command dispatch:
2015-08-28 10:14:17.964017 mon.0 [INF] from='client.? 10.42.5.61:0/1002181'
entity='client.admin' cmd=[{"prefix": "pg repair", "pgid": "2.36"}]:
dispatch
But I never see a "finish" in the mon log, like most ceph commands return.
(Not sure if I should expect to see a finish, just noting it doesn't occur.)
Also, tailing the logs for any OSD in the acting set for pg 2.36, I never
see anything about a repair. The same case holds when I try "ceph pg 2.36
deep-scrub" - command dispatched, but none of the OSDs care. In the past on
other clusters, I've seen "[INF] : pg.id repair starts" messages in the OSD
log after executing "ceph pg nn.yy repair".
Further confusing me, I do see osd.1 start and finish other pg deep-scrubs,
before and after executing "ceph pg 2.36 deep-scrub".
I know EC pools are special in several ways, but nothing in the Ceph manual
seems to indicate I can't deep-scrub or repair pgs in an EC pool...
Thanks for reading and any suggestions. I'm happy to provide complete log
files or more details if I've left out any information that could be
helpful.
ceph -s: http://hastebin.com/xetohugibi
ceph pg dump: http://hastebin.com/bijehoheve
ceph -v: ceph version 9.0.2 (be422c8f5b494c77ebcf0f7b95e5d728ecacb7f0)
ceph osd dump: http://hastebin.com/fitajuzeca
-Aaron
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