I suspect the data for one or more shards on this osd's underlying
filesystem has a marginally bad sector or sectors. A read from the deep
scrub may be causing the drive to perform repeated seeks and reads of
the sector until it gets a good read from the filesystem. You might
want to look at the SMART info on the drive or drives in the RAID set to
see what the error counts suggest about this. You may also be looking
at a drive that's about to fail.
Bill Sharer
On 07/28/2016 08:46 AM, c wrote:
Hello Ceph alikes :)
i have a strange issue with one PG (0.223) combined with "deep-scrub".
Always when ceph - or I manually - run a " ceph pg deep-scrub 0.223 ",
this leads to many "slow/block requests" so that nearly all of my VMs
stop working for a while.
This happens only to this one PG 0.223 and in combination with
deep-scrub (!). All other Placement Groups where a deep-scrub occurs
are fine. The mentioned PG also works fine when a "normal scrub" occurs.
These OSDs are involved:
#> ceph pg map 0.223
osdmap e7047 pg 0.223 (0.223) -> up [4,16,28] acting [4,16,28]
*The LogFiles*
"deep-scrub" starts @ 2016-07-28 12:44:00.588542 and takes
approximately 12 Minutes (End: 2016-07-28 12:56:31.891165)
- ceph.log: http://pastebin.com/FSY45VtM
I have done " ceph tell osd injectargs '--debug-osd = 5/5' " for the
related OSDs 4,16 and 28
LogFile - osd.4
- ceph-osd.4.log: http://slexy.org/view/s20zzAfxFH
LogFile - osd.16
- ceph-osd.16.log: http://slexy.org/view/s25H3Zvkb0
LogFile - osd.28
- ceph-osd.28.log: http://slexy.org/view/s21Ecpwd70
I have checked the disks 4,16 and 28 with smartctl and could not any
issues - also there are no odd "dmesg" messages.
*ceph -s*
cluster 98a410bf-b823-47e4-ad17-4543afa24992
health HEALTH_OK
monmap e2: 3 mons at
{monitor1=172.16.0.2:6789/0,monitor3=172.16.0.4:6789/0,monitor2=172.16.0.3:6789/0}
election epoch 38, quorum 0,1,2 monitor1,monitor2,monitor3
osdmap e7047: 30 osds: 30 up, 30 in
flags sortbitwise
pgmap v3253519: 1024 pgs, 1 pools, 2858 GB data, 692 kobjects
8577 GB used, 96256 GB / 102 TB avail
1024 active+clean
client io 396 kB/s rd, 3141 kB/s wr, 55 op/s rd, 269 op/s wr
This is my Setup:
*Software/OS*
- Jewel
#> ceph tell osd.* version | grep version | uniq
"version": "ceph version 10.2.2
(45107e21c568dd033c2f0a3107dec8f0b0e58374)"
#> ceph tell mon.* version
[...] ceph version 10.2.2 (45107e21c568dd033c2f0a3107dec8f0b0e58374)
- Ubuntu 16.04 LTS on all OSD and MON Server
#> uname -a
Linux galawyn 4.4.0-31-generic #50-Ubuntu SMP Wed Jul 13 00:07:12 UTC
2016 x86_64 x86_64 x86_64 GNU/Linux
*Server*
3x OSD Server, each with
- 2x Intel(R) Xeon(R) CPU E5-2603 v3 @ 1.60GHz ==> 12 Cores, no
Hyper-Threading
- 64GB RAM
- 10x 4TB HGST 7K4000 SAS2 (6GB/s) Disks as OSDs
- 1x INTEL SSDPEDMD400G4 (Intel DC P3700 NVMe) as Journaling Device
for 10-12 Disks
- 1x Samsung SSD 840/850 Pro only for the OS
3x MON Server
- Two of them with 1x Intel(R) Xeon(R) CPU E3-1265L V2 @ 2.50GHz (4
Cores, 8 Threads)
- The third one has 2x Intel(R) Xeon(R) CPU L5430 @ 2.66GHz ==> 8
Cores, no Hyper-Threading
- 32 GB RAM
- 1x Raid 10 (4 Disks)
*Network*
- Each Server and Client has an active connection @ 1x 10GB; A second
connection is also connected via 10GB but provides only a Backup
connection when the active Switch fails - no LACP possible.
- We do not use Jumbo Frames yet..
- Public and Cluster-Network related Ceph traffic is going through
this one active 10GB Interface on each Server.
Any ideas what is going on?
Can I provide more input to find a solution?
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