On 07/15/2015 01:17 AM, Jeya Ganesh Babu Jegatheesan wrote:
> Hi,
>
> We have a Openstack + Ceph cluster based on Giant release. We use ceph for
> the VMs volumes including the boot volumes. Under load, we see the write
> access to the volumes stuck from within the VM. The same would work after a
> VM reboot. The issue is seen with and without rbd cache. Let me know if this
> is some known issue and any way to debug further. The ceph cluster itself
> seems to be clean. We have currently disabled scrub and deep scrub. 'ceph -s'
> output as below.
>
Are you seeing slow requests in the system?
Are any of the disks under the OSDs 100% busy or close to it?
Btw, the amount of PGs is rather high. You are at 88, while the formula
recommends:
num_osd * 100 / 3 = 14k (cluster total)
Wido
> cluster eaaeaa55-a8e7-4531-a5eb-03d73028b59d
> health HEALTH_WARN noscrub,nodeep-scrub flag(s) set
> monmap e71: 9 mons at
> {gngsvc009a=10.163.43.1:6789/0,gngsvc009b=10.163.43.2:6789/0,gngsvc010a=10.163.43.5:6789/0,gngsvc010b=10.163.43.6:6789/0,gngsvc011a=10.163.43.9:6789/0,gngsvc011b=10.163.43.10:6789/0,gngsvc011c=10.163.43.11:6789/0,gngsvm010d=10.163.43.8:6789/0,gngsvm011d=10.163.43.12:6789/0},
> election epoch 22246, quorum 0,1,2,3,4,5,6,7,8
> gngsvc009a,gngsvc009b,gngsvc010a,gngsvc010b,gngsvm010d,gngsvc011a,gngsvc011b,gngsvc011c,gngsvm011d
> osdmap e54600: 425 osds: 425 up, 425 in
> flags noscrub,nodeep-scrub
> pgmap v13257438: 37620 pgs, 4 pools, 134 TB data, 35289 kobjects
> 402 TB used, 941 TB / 1344 TB avail
> 37620 active+clean
> client io 94059 kB/s rd, 313 MB/s wr, 4623 op/s
>
>
> The traces we see in the VM's kernel are as below.
>
> [ 1080.552901] INFO: task jbd2/vdb-8:813 blocked for more than 120 seconds.
> [ 1080.553027] Tainted: GF O 3.13.0-34-generic
> #60~precise1-Ubuntu
> [ 1080.553157] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
> this message.
> [ 1080.553295] jbd2/vdb-8 D ffff88003687e3e0 0 813 2
> 0x00000000
> [ 1080.553298] ffff880444fadb48 0000000000000002 ffff880455114440
> ffff880444fadfd8
> [ 1080.553302] 0000000000014440 0000000000014440 ffff88044a9317f0
> ffff88044b7917f0
> [ 1080.553303] ffff880444fadb48 ffff880455114cd8 ffff88044b7917f0
> ffffffff811fc670
> [ 1080.553307] Call Trace:
> [ 1080.553309] [<ffffffff811fc670>] ? __wait_on_buffer+0x30/0x30
> [ 1080.553311] [<ffffffff8175b8b9>] schedule+0x29/0x70
> [ 1080.553313] [<ffffffff8175b98f>] io_schedule+0x8f/0xd0
> [ 1080.553315] [<ffffffff811fc67e>] sleep_on_buffer+0xe/0x20
> [ 1080.553316] [<ffffffff8175c052>] __wait_on_bit+0x62/0x90
> [ 1080.553318] [<ffffffff811fc670>] ? __wait_on_buffer+0x30/0x30
> [ 1080.553320] [<ffffffff8175c0fc>] out_of_line_wait_on_bit+0x7c/0x90
> [ 1080.553322] [<ffffffff810aff70>] ? wake_atomic_t_function+0x40/0x40
> [ 1080.553324] [<ffffffff811fc66e>] __wait_on_buffer+0x2e/0x30
> [ 1080.553326] [<ffffffff8129806b>]
> jbd2_journal_commit_transaction+0x136b/0x1520
> [ 1080.553329] [<ffffffff810a1f75>] ? sched_clock_local+0x25/0x90
> [ 1080.553331] [<ffffffff8109a7b8>] ? finish_task_switch+0x128/0x170
> [ 1080.553333] [<ffffffff8107891f>] ? try_to_del_timer_sync+0x4f/0x70
> [ 1080.553334] [<ffffffff8129c5d8>] kjournald2+0xb8/0x240
> [ 1080.553336] [<ffffffff810afef0>] ? __wake_up_sync+0x20/0x20
> [ 1080.553338] [<ffffffff8129c520>] ? commit_timeout+0x10/0x10
> [ 1080.553340] [<ffffffff8108fa79>] kthread+0xc9/0xe0
> [ 1080.553343] [<ffffffff8108f9b0>] ? flush_kthread_worker+0xb0/0xb0
> [ 1080.553346] [<ffffffff8176827c>] ret_from_fork+0x7c/0xb0
> [ 1080.553349] [<ffffffff8108f9b0>] ? flush_kthread_worker+0xb0/0xb0
>
> Thanks,
> Jeyaganesh.
>
>
>
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--
Wido den Hollander
42on B.V.
Ceph trainer and consultant
Phone: +31 (0)20 700 9902
Skype: contact42on
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