Hello Christian .
Sorry for my mistake it's Infernalis we're running ( 9.2.1 )
our tree looks like this -->
root@ecprdbcph01-opens:~# ceph osd tree
ID WEIGHT TYPE NAME UP/DOWN REWEIGHT PRIMARY-AFFINITY
-1 51.26370 root default
-2 8.49396 host ecprdbcph03-opens
3 0.86800 osd.3 up 1.00000 1.00000
4 0.86800 osd.4 up 1.00000 1.00000
6 0.86800 osd.6 up 1.00000 1.00000
8 0.86800 osd.8 up 1.00000 1.00000
10 0.86800 osd.10 up 1.00000 1.00000
12 0.79999 osd.12 up 1.00000 1.00000
14 0.75000 osd.14 up 1.00000 1.00000
16 0.86800 osd.16 up 1.00000 1.00000
18 0.86800 osd.18 up 1.00000 1.00000
29 0.86800 osd.29 up 1.00000 1.00000
-3 8.40794 host ecprdbcph01-opens
5 0.84999 osd.5 up 0.87172 1.00000
7 0.86800 osd.7 up 1.00000 1.00000
9 0.86800 osd.9 up 0.85579 1.00000
11 0.86800 osd.11 up 1.00000 1.00000
13 0.84999 osd.13 up 1.00000 1.00000
15 0.86800 osd.15 up 1.00000 1.00000
17 0.79999 osd.17 up 1.00000 1.00000
19 0.86800 osd.19 up 1.00000 1.00000
1 0.70000 osd.1 up 1.00000 1.00000
2 0.86800 osd.2 up 1.00000 1.00000
-4 8.45793 host ecprdbcph02-opens
20 0.84999 osd.20 up 0.85753 1.00000
25 0.86800 osd.25 up 1.00000 1.00000
26 0.86800 osd.26 up 1.00000 1.00000
21 0.79999 osd.21 up 0.86604 1.00000
22 0.86800 osd.22 up 1.00000 1.00000
23 0.86800 osd.23 up 1.00000 1.00000
24 0.79999 osd.24 up 1.00000 1.00000
27 0.86800 osd.27 up 0.79852 1.00000
28 0.86800 osd.28 up 0.89223 1.00000
0 0.79999 osd.0 up 0.84404 1.00000
-5 8.67996 host ecprdbcph06-opens
30 0.86800 osd.30 up 0.90486 1.00000
32 0.86800 osd.32 up 0.83070 1.00000
34 0.86800 osd.34 up 1.00000 1.00000
41 0.86800 osd.41 up 0.83226 1.00000
44 0.86800 osd.44 up 1.00000 1.00000
47 0.86800 osd.47 up 1.00000 1.00000
49 0.86800 osd.49 up 1.00000 1.00000
51 0.86800 osd.51 up 1.00000 1.00000
53 0.86800 osd.53 up 1.00000 1.00000
55 0.86800 osd.55 up 1.00000 1.00000
-6 8.54395 host ecprdbcph04-opens
31 0.86800 osd.31 up 0.85638 1.00000
36 0.86800 osd.36 up 1.00000 1.00000
38 0.86800 osd.38 up 1.00000 1.00000
40 0.79999 osd.40 up 0.89485 1.00000
42 0.86800 osd.42 up 0.86018 1.00000
45 0.79999 osd.45 up 1.00000 1.00000
48 0.86800 osd.48 up 0.88635 1.00000
50 0.86800 osd.50 up 1.00000 1.00000
52 0.86800 osd.52 up 1.00000 1.00000
54 0.86800 osd.54 up 1.00000 1.00000
-7 8.67996 host ecprdbcph05-opens
33 0.86800 osd.33 up 1.00000 1.00000
35 0.86800 osd.35 up 1.00000 1.00000
37 0.86800 osd.37 up 1.00000 1.00000
39 0.86800 osd.39 up 1.00000 1.00000
43 0.86800 osd.43 up 1.00000 1.00000
46 0.86800 osd.46 up 0.85481 1.00000
56 0.86800 osd.56 up 1.00000 1.00000
57 0.86800 osd.57 up 0.88829 1.00000
58 0.86800 osd.58 up 1.00000 1.00000
59 0.86800 osd.59 up 0.80495 1.00000
root@ecprdbcph01-opens:~#
we have an ongoing capacity issue as you can see below ( although we're only using less then 80% )
root@ecprdbcph01-opens:/var/lib/ceph/osd/ceph-11/current# ceph df
GLOBAL:
SIZE AVAIL RAW USED %RAW USED
53329G 11219G 42110G 78.96
osd.12 is near full at 85%
osd.16 is near full at 85%
osd.17 is near full at 87%
osd.19 is near full at 85%
osd.22 is near full at 87%
osd.24 is near full at 87%
osd.29 is near full at 85%
osd.33 is near full at 86%
osd.39 is near full at 85%
osd.42 is near full at 87%
osd.45 is near full at 87%
osd.47 is near full at 87%
osd.49 is near full at 88%
osd.58 is near full at 87%
i'm trying to decrease the weigh as you've suggested but it looks like we have some troubles :
ceph osd crush reweight osd.11 0.98
tail -f ceph-osd.11.log
2017-01-03 07:38:41.952538 7f9a5c7e1700 0 -- 10.63.4.1:6808/3301342 >> 10.63.4.19:6827/2264381 pipe(0x7f9ad3df4000 sd=442 :6808 s=0 pgs=0 cs=0 l=0 c=0x7f9ac2530000).accept connect_seq 34 vs existing 33 state standby
2017-01-03 07:41:46.566313 7f9a73871700 0 -- 10.63.4.1:6808/3301342 >> 10.63.4.1:6830/3303583 pipe(0x7f9ac80d5000 sd=376 :6808 s=0 pgs=0 cs=0 l=0 c=0x7f9ac2530160).accept connect_seq 4 vs existing 4 state standby
2017-01-03 07:41:46.566370 7f9a73871700 0 -- 10.63.4.1:6808/3301342 >> 10.63.4.1:6830/3303583 pipe(0x7f9ac80d5000 sd=376 :6808 s=0 pgs=0 cs=0 l=0 c=0x7f9ac2530160).accept connect_seq 5 vs existing 4 state standby
2017-01-03 07:41:46.585562 7f9a631d9700 0 -- 10.63.4.1:6808/3301342 >> 10.63.4.1:6824/3303035 pipe(0x7f9ab9940000 sd=283 :6808 s=0 pgs=0 cs=0 l=0 c=0x7f9ac2532ec0).accept connect_seq 5 vs existing 5 state standby
2017-01-03 07:41:46.585608 7f9a631d9700 0 -- 10.63.4.1:6808/3301342 >> 10.63.4.1:6824/3303035 pipe(0x7f9ab9940000 sd=283 :6808 s=0 pgs=0 cs=0 l=0 c=0x7f9ac2532ec0).accept connect_seq 6 vs existing 5 state standby
in general i've also tried to use reweight-by-utilization but it doesn't seem to work so well
Is there any known bug with our version ? will a restart of the osds solve this issue ( it was menstioned in one of the forum's threads but it was related to firefly )
Many Thanks .
Yair Magnezi
Storage & Data Protection TL // Kenshoo
Office +972 7 32862423 // Mobile +972 50 575-2955
__________________________________________
On Tue, Jan 3, 2017 at 1:41 PM, Christian Balzer <chibi@xxxxxxx> wrote:
Hello,
On Tue, 3 Jan 2017 13:08:50 +0200 Yair Magnezi wrote:
> Hello cephers
> We're running firefly ( 9.2.1 )
One of these two is wrong, you're either running Firefly (0.8.x, old and
unsupported) or Infernalis (9.2.x, non-LTS and thus also unsupported).
> I'm trying to re balance our cluster's osd and from some reason it looks
> like the re balance is going the wrong way :
A "ceph osd tree" would be helpful for starters.
> What's i'm trying to do is to reduce the loads from osd-14 ( ceph osd
> crush reweight osd.14 0.75 ) but what i see is the the backfill process is
> moving pgs to osd-29 which is also 86% full
> i wonder why the crash doesn't map to the less occupied osd-s ( 3 , 4 6
> for example )
> Any input is much appreciated .
>
CRUSH isn't particular deterministic from a human perspective and often
data movements will involve steps that are not anticipated.
CRUSH also does NOT know nor involve the utilization of OSDs, only their
weight counts.
If you're having extreme in-balances, RAISE the weight of the least
utilized OSDs first (and in very small increments until you get a
feeling for things).
Do this in a manner to keep the weights of hosts more or less the same
in the end.
Christian
>
>
> 2017-01-03 05:59:20.877705 7f3e6a0d6700 0 log_channel(cluster) log
> [INF] : *2.2cb
> starting backfill to osd.29 from* (0'0,0'0] MAX to 131306'8029954
> *Yair Magnezi *> 2017-01-03 05:59:20.877841 7f3e670d0700 0 log_channel(cluster) log [INF] :
> 2.30d starting backfill to osd.10 from (0'0,0'0] MAX to 131306'8721158
> 2017-01-03 05:59:31.374323 7f3e356b0700 0 -- 10.63.4.3:6826/3125306 >>
> 10.63.4.5:6821/3162046 pipe(0x7f3e9d513000 sd=322 :6826 s=0 pgs=0 cs=0 l=0
> c=0x7f3ea72b5de0).accept connect_seq 1605 vs existing 1605 state standby
> 2017-01-03 05:59:31.374440 7f3e356b0700 0 -- 10.63.4.3:6826/3125306 >>
> 10.63.4.5:6821/3162046 pipe(0x7f3e9d513000 sd=322 :6826 s=0 pgs=0 cs=0 l=0
> c=0x7f3ea72b5de0).accept connect_seq 1606 vs existing 1605 state standby
> ^C
> root@ecprdbcph03-opens:/var/log/ceph# df -h
> Filesystem Size Used Avail Use% Mounted on
> udev 32G 4.0K 32G 1% /dev
> tmpfs 6.3G 1.4M 6.3G 1% /run
> /dev/dm-1 106G 4.1G 96G 5% /
> none 4.0K 0 4.0K 0% /sys/fs/cgroup
> none 5.0M 0 5.0M 0% /run/lock
> none 32G 0 32G 0% /run/shm
> none 100M 0 100M 0% /run/user
> /dev/sdk2 465M 50M 391M 12% /boot
> /dev/sdk1 512M 3.4M 509M 1% /boot/efi
> ec-mapr-prd:/mapr/ec-mapr-prd/homes 262T 143T 119T 55% /export/home
> /dev/sde1 889G 640G 250G 72%
> /var/lib/ceph/osd/ceph-3
> /dev/sdf1 889G 656G 234G 74%
> /var/lib/ceph/osd/ceph-4
> /dev/sdg1 889G 583G 307G 66%
> /var/lib/ceph/osd/ceph-6
> /dev/sda1 889G 559G 331G 63%
> /var/lib/ceph/osd/ceph-8
> /dev/sdb1 889G 651G 239G 74%
> /var/lib/ceph/osd/ceph-10
> /dev/sdc1 889G 751G 139G 85%
> /var/lib/ceph/osd/ceph-12
> /dev/sdh1 889G 759G 131G 86%
> /var/lib/ceph/osd/ceph-14
> /dev/sdi1 889G 763G 127G 86%
> /var/lib/ceph/osd/ceph-16
> /dev/sdj1 889G 732G 158G 83%
> /var/lib/ceph/osd/ceph-18
> /dev/sdd1 889G 756G 134G 86%
> /var/lib/ceph/osd/ceph-29
> root@ecprdbcph03-opens:/var/log/ceph#
>
> Thanks
>
>
>
>
>
>
> *Storage & Data Protection TL // Kenshoo*
>
--
Christian Balzer Network/Systems Engineer
chibi@xxxxxxx Global OnLine Japan/Rakuten Communications
http://www.gol.com/
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