Hi All,
I left out my OS/kernel version, Ubuntu 12.04.4 LTS w/ Kernel
3.10.33-031033-generic (We upgrade our kernels to 3.10 due to Dell Drivers).
Here's an example of starting all the OSD's after a reboot.
top - 09:10:51 up 2 min, 1 user, load average: 332.93, 112.28, 39.96
Tasks: 310 total, 1 running, 309 sleeping, 0 stopped, 0 zombie
Cpu(s): 50.3%us, 32.5%sy, 0.0%ni, 0.0%id, 0.0%wa, 17.2%hi, 0.0%si, 0.0%st
Mem: 32917276k total, 6331224k used, 26586052k free, 1332k buffers
Swap: 33496060k total, 0k used, 33496060k free, 1474084k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
15875 root 20 0 910m 381m 50m S 60 1.2 0:50.57 ceph-osd
2996 root 20 0 867m 330m 44m S 59 1.0 0:58.32 ceph-osd
4502 root 20 0 907m 372m 47m S 58 1.2 0:55.14 ceph-osd
12465 root 20 0 949m 418m 55m S 58 1.3 0:51.79 ceph-osd
4171 root 20 0 886m 348m 45m S 57 1.1 0:56.17 ceph-osd
3707 root 20 0 941m 405m 50m S 57 1.3 0:59.68 ceph-osd
3560 root 20 0 924m 394m 51m S 56 1.2 0:59.37 ceph-osd
4318 root 20 0 965m 435m 55m S 56 1.4 0:54.80 ceph-osd
3337 root 20 0 935m 407m 51m S 56 1.3 1:01.96 ceph-osd
3854 root 20 0 897m 366m 48m S 55 1.1 1:00.55 ceph-osd
3143 root 20 0 1364m 424m 24m S 16 1.3 1:08.72 ceph-osd
2509 root 20 0 652m 261m 62m S 2 0.8 0:26.42 ceph-mon
4 root 20 0 0 0 0 S 0 0.0 0:00.08 kworker/0:0
Regards,
Quenten Grasso
From: ceph-users-boun...@lists.ceph.com
[mailto:ceph-users-boun...@lists.ceph.com] On Behalf Of Quenten Grasso
Sent: Tuesday, 18 March 2014 10:19 PM
To: 'ceph-users@lists.ceph.com'
Subject: [ceph-users] OSD Restarts cause excessively high load average and
"requests are blocked > 32 sec"
Hi All,
I'm trying to troubleshoot a strange issue with my Ceph cluster.
We're Running Ceph Version 0.72.2
All Nodes are Dell R515's w/ 6C AMD CPU w/ 32GB Ram, 12 x 3TB NearlineSAS
Drives and 2 x 100GB Intel DC S3700 SSD's for Journals.
All Pools have a replica of 2 or better. I.e. metadata replica of 3.
I have 55 OSD's in the cluster across 5 nodes. When I restart the OSD's on a
single node (any node) the load average of that node shoots up to 230+ and the
whole cluster starts blocking IO requests until it settles down and its fine
again.
Any ideas on why the load average goes so crazy & starts to block IO?
<snips from my ceph.conf>
[osd]
osd data = /var/ceph/osd.$id
osd journal size = 15000
osd mkfs type = xfs
osd mkfs options xfs = "-i size=2048 -f"
osd mount options xfs =
"rw,noexec,nodev,noatime,nodiratime,barrier=0,inode64,logbufs=8,logbsize=256k"
osd max backfills = 5
osd recovery max active = 3
[osd.0]
host = pbnerbd01
public addr = 10.100.96.10
cluster addr = 10.100.128.10
osd journal =
/dev/disk/by-id/scsi-36b8ca3a0eaa2660019deaf8d3a40bec4-part1
devs = /dev/sda4
</end>
Thanks,
Quenten
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