Hi Wido
Thanks for the quick answer. They are all Intel p3520
https://ark.intel.com/content/www/us/en/ark/products/88727/intel-ssd-dc-p3520-series-2-0tb-2-5in-pcie-3-0-x4-3d1-mlc.html
And this is ceph df
RAW STORAGE:
CLASS SIZE AVAIL USED RAW USED %RAW USED
nvme 11 TiB 2.3 TiB 8.6 TiB 8.7 TiB 79.28
TOTAL 11 TiB 2.3 TiB 8.6 TiB 8.7 TiB 79.28
POOLS:
POOL ID STORED OBJECTS USED %USED MAX AVAIL
ceph 8 2.9 TiB 769.41k 8.6 TiB 89.15 359 GiB
Cheers
Raffael
On 29/07/2020 15:04, Wido den Hollander wrote:
On 29/07/2020 14:52, Raffael Bachmann wrote:
Hi All,
I'm kind of crossposting this from here:
https://forum.proxmox.com/threads/i-o-wait-after-upgrade-5-x-to-6-2-and-ceph-luminous-to-nautilus.73581/
But since I'm more and more sure that it's a ceph problem I'll try my
luck here.
Since updating from Luminous to Nautilus I have a big problem.
I have a 3 node cluster. Each cluster has 2 nvme ssd and a 10GBASE-T
net for ceph.
Every few minutes a osd seems to compact the rocksdb. While doing
this it uses alot of I/O and blocks.
This basically blocks the whole cluster and no VM/Container can read
data for some seconds (minutes).
While it happens "iostat -x" looks like this:
Device r/s w/s rkB/s wkB/s rrqm/s wrqm/s
%rrqm %wrqm r_await w_await aqu-sz rareq-sz wareq-sz svctm %util
nvme0n1 0.00 2.00 0.00 24.00 0.00 46.00
0.00 95.83 0.00 0.00 0.00 0.00 12.00 2.00 0.40
nvme1n1 0.00 1495.00 0.00 3924.00 0.00 6099.00
0.00 80.31 0.00 352.39 523.78 0.00 2.62 0.67 100.00
And iotop:
Total DISK READ: 0.00 B/s | Total DISK WRITE: 1573.47 K/s
Current DISK READ: 0.00 B/s | Current DISK WRITE: 3.43 M/s
TID PRIO USER DISK READ DISK WRITE SWAPIN IO> COMMAND
2306 be/4 ceph 0.00 B/s 1533.22 K/s 0.00 % 99.99 %
ceph-osd -f --cluster ceph --id 3 --setuser ceph --setgroup ceph
[rocksdb:low1]
In the ceph-osd log I see that rocksdb is compacting.
https://gist.github.com/qwasli/3bd0c7d535ee462feff8aaee618f3e08
The pool and one OSD is nearfull. I'd planed to move some data away
to another ceph pool. But now I'm not sure anymore if I should go
with ceph.
I'l move some data away anyway today to see if that helps, but before
the upgrade there was the same amount of data an I haven't had a
problem.
Any hints to solve this are appreciated.
What model/type of NVMe is this?
And on a nearfull cluster these problems can arise, it's usually not a
good idea to have OSDs be nearfull.
What does 'ceph df' tell you?
Wido
Cheers
Raffael
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