On 7/14/15, 4:56 PM, "ceph-users on behalf of Wido den Hollander"
<ceph-users-boun...@lists.ceph.com on behalf of w...@42on.com> wrote:

>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?
 
I dont see slow requests in the cluster.

>
>Are any of the disks under the OSDs 100% busy or close to it?

Most of the OSDs use 20% of a core. There is no OSD process busy at 100%.

>
>Btw, the amount of PGs is rather high. You are at 88, while the formula
>recommends:
>
>num_osd * 100 / 3 = 14k (cluster total)

We used 30 * num_osd per pool. We do have 4 pools, i believe thats the why
the PG seems to be be high.

>
>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=1
>>0.163.43.5:6789/0,gngsvc010b=10.163.43.6:6789/0,gngsvc011a=10.163.43.9:67
>>89/0,gngsvc011b=10.163.43.10:6789/0,gngsvc011c=10.163.43.11:6789/0,gngsvm
>>010d=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,gngsvc0
>>11b,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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