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.
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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