Hi Christian,
Hello Bill,
thank you very much for your Post.
For the record, this ONLY happens with this PG and no others that share
the same OSDs, right?
Yes, right.
If so then we're looking at something (HDD or FS wise) that's specific
to
the data of this PG.
When doing the deep-scrub, monitor (atop, etc) all 3 nodes and see if a
particular OSD (HDD) stands out, as I would expect it to.
Now I logged all disks via atop each 2 seconds while the deep-scrub was
running ( atop -w osdXX_atop 2 ).
As you expected all disks was 100% busy - with constant 150MB (osd.4),
130MB (osd.28) and 170MB (osd.16)...
- osd.4 (/dev/sdf) http://slexy.org/view/s21emd2u6j
- osd.16 (/dev/sdm): http://slexy.org/view/s20vukWz5E
- osd.28 (/dev/sdh): http://slexy.org/view/s20YX0lzZY
You can have a look on this logs via "atop -r FILE" and jump to the time
when you press "b" and type "17:12:31".
With "t" you can "walk" forward and "T" backward through the logfile.
But what is causing this? A deep-scrub on all other disks - same model
and ordered at the same time - seems to not have this issue.
>Bill<
Removing osd.4 and still getting the scrub problems removes its drive
from consideration as the culprit. Try the same thing again for osd.16
and then osd.28.
>Christian<
Since you already removed osd.4 with the same result, continue to cycle
through the other OSDs.
Running a fsck on the (out) OSDs might be helpful, too.
Next week, I will do this
1.1 Remove osd.4 completely from Ceph - again (the actual primary for PG
0.223)
1.2 xfs_repair -n /dev/sdf1 (osd.4): to see possible error
1.3 ceph pg deep-scrub 0.223
- Log with " ceph tell osd.4,16,28 injectargs "--debug_osd 5/5"
2.1 Remove osd.16 completely from Ceph
2.2 xfs_repair -n /dev/sdm1
2.3 ceph pg deep-scrub 0.223
- Log with " ceph tell osd.4,16,28 injectargs "--debug_osd 5/5"
3.1 Remove osd.16 completely from Ceph
3.2 xfs_repair -n /dev/sdm1
3.3 ceph pg deep-scrub 0.223
- Log with " ceph tell osd.4,16,28 injectargs "--debug_osd 5/5"
smartctl may not show anything out of sorts until the marginally bad
sector or sectors finally goes bad and gets remapped. The only hint
may be buried in the raw read error rate, seek error rate or other
error counts like ecc or crc errors. The long test you are running may
or may not show any new information.
I will write you again next week when I have done the tests above.
- Mehmet
Am 2016-07-29 03:05, schrieb Christian Balzer:
Hello,
On Thu, 28 Jul 2016 14:46:58 +0200 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.
For the record, this ONLY happens with this PG and no others that share
the same OSDs, right?
If so then we're looking at something (HDD or FS wise) that's specific
to
the data of this PG.
When doing the deep-scrub, monitor (atop, etc) all 3 nodes and see if a
particular OSD (HDD) stands out, as I would expect it to.
Since you already removed osd.4 with the same result, continue to cycle
through the other OSDs.
Running a fsck on the (out) OSDs might be helpful, too.
Christian
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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