On Mon, Feb 11, 2013 at 11:00:15AM -0600, Sam Lang wrote:
> Hi Kevin, sorry for the delayed response.
> This looks like the mds cache is thrashing quite a bit, and with
> multiple MDSs the tree partitioning is causing those estale messages.
> In your case, you should probably run with just a single active mds (I
> assume all three MDSs are active, but ceph -s will tell you for sure),
> and the others as standby. I don't think you'll be able to do that
> without starting over though.
Hi Sam,
I know that MDS clustering is a bit buggy so I have only one active MDS
on this cluster.
Here is the output of ceph -s:
~ # ceph -s
health HEALTH_OK
monmap e1: 3 mons at {a=x:6789/0,b=y:6789/0,c=z:6789/0}, election epoch 48, quorum 0,1,2 a,b,c
osdmap e79: 27 osds: 27 up, 27 in
pgmap v895343: 5376 pgs: 5376 active+clean; 18987 MB data, 103 GB used, 21918 GB / 23201 GB avail
mdsmap e73: 1/1/1 up {0=b=up:active}, 2 up:standby
> Also, you might want to increase the size of the mds cache if you have
> enough memory on that machine. mds cache size defaults to 100k, you
> might increase it to 300k and see if you get the same problems.
I have 24GB of memory for each MDS, I will try to increase this value.
Thanks for advice.
> Do you have debug logging enabled when you see this crash? Can you
> compress that mds log and post it somewhere or email it to me?
Yes, I have 34GB of raw logs (for this issue) but I have no debug log
of the beginning of the storm itself. I will upload a compressed
archive.
Furthermore, I observe another strange thing more or less related to the
storms.
During a rsync command to write ~20G of data on Ceph and during (and
after) the storm, one OSD sends a lot of data to the active MDS
(400Mbps peak each 6 seconds). After a quick check, I found that when I
stop osd.23, osd.14 stops its peaks.
I will forward a copy of the debug enabled log of osd14.
The only significant difference between osd.23 and others is the list of
hb_in where osd.14 is missing (but I think it's unrelated).
~ # ceph pg dump
osdstat kbused kbavail kb hb in hb out
0 4016228 851255948 901042464 [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26] []
1 4108748 851163428 901042464 [0,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,18,19,20,21,22,23,24,25,26] []
2 4276584 850995592 901042464 [0,1,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26] []
3 3997368 851274808 901042464 [0,1,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26] []
4 4358212 850913964 901042464 [0,1,2,3,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26] []
5 4039112 851233064 901042464 [0,1,2,3,4,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26] []
6 3971568 851300608 901042464 [0,1,2,3,4,5,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26] []
7 3942556 851329620 901042464 [0,1,2,3,4,5,6,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26] []
8 4275584 850996592 901042464 [0,1,2,3,4,5,6,7,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26] []
9 4279308 850992868 901042464 [0,1,2,3,4,5,6,7,8,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26] []
10 3728136 851544040 901042464 [0,1,2,3,4,5,6,7,8,9,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26] []
11 3934096 851338080 901042464 [0,1,2,3,4,5,6,7,8,9,10,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26] []
12 3991600 851280576 901042464 [0,1,2,3,4,5,6,7,8,9,10,11,13,14,15,16,17,18,19,20,21,22,23,24,25,26] []
13 4211228 851060948 901042464 [0,1,2,3,4,5,6,7,8,9,10,11,12,14,15,16,17,18,19,20,21,22,23,24,25,26] []
14 4169476 851102700 901042464 [0,1,2,3,4,5,6,7,8,9,10,11,12,13,15,16,17,18,19,20,21,22,23,24,25,26] []
15 4385584 850886592 901042464 [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,16,17,18,19,20,21,22,23,24,25,26] []
16 3761176 851511000 901042464 [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,17,18,19,20,21,22,23,24,25,26] []
17 3646096 851626080 901042464 [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,18,19,20,21,22,23,24,25,26] []
18 4119448 851152728 901042464 [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,19,20,21,22,23,24,25,26] []
19 4592992 850679184 901042464 [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,20,21,22,23,24,25,26] []
20 3740840 851531336 901042464 [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,21,22,23,24,25,26] []
21 4363552 850908624 901042464 [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,22,23,24,25,26] []
22 3831420 851440756 901042464 [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,23,24,25,26] []
23 3681648 851590528 901042464 [0,1,2,3,4,5,6,7,8,9,10,11,12,13,15,16,17,18,19,20,21,22,24,25,26] []
24 3946192 851325984 901042464 [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,25,26] []
25 3954360 851317816 901042464 [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,26] []
26 3775532 851496644 901042464 [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25] []
sum 109098644 22983250108 24328146528
Cheers,
--
Kevin Decherf - @Kdecherf
GPG C610 FE73 E706 F968 612B E4B2 108A BD75 A81E 6E2F
http://kdecherf.com
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