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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