Hi,
I echo Jim's findings. Going from lower Nautilus versions up to .10 on 4
installations suddenly gave a huge drop in read performance, probably by
about 3/4, so that my users were complaining that VMs were taking ages
to boot up. Strangely, write performance was not affected so much.
Kind regards,
Dave
------ Original Message ------
From: "rainning" <tweetypie@xxxxxx>
To: "Jim Forde" <jimf@xxxxxxxxx>; "ceph-users" <ceph-users@xxxxxxx>
Sent: Thursday, 6 Aug, 2020 At 02:02
Subject: Re: Nautilus slow using "ceph tell osd.* bench"
Hi Jim, did you check system stat (e.g. iostat, top, etc.) on both osds
when you ran osd bench? Those might be able to give you some clues.
Moreover, did you compare both osds' configurations?
------------------ Original ------------------
From:
"Jim Forde"
<jimf@xxxxxxxxx>;
Date: Thu, Aug 6, 2020 06:51 AM
To: "ceph-users"<ceph-users@xxxxxxx>;
Subject: Nautilus slow using "ceph tell osd.* bench"
I have 2 clusters. Cluster 1 started at Hammer and has upgraded through
the versions all the way to Nautilus 14.2.10 (Luminous to Nautilus in
July 2020) . Cluster 2 started as Luminous and is now Nautilus 14.2.2
(Upgraded in September 2019) The clusters are basically identical 5 OSD
Nodes with 6 osd's per node. They are both using disk drives. No SSD's.
Prior to upgrading Cluster 1 running "ceph tell osd.0 bench -f plain"
produced similar results across both clusters.
ceph tell osd.0 bench -f plain
bench: wrote 1 GiB in blocks of 4 MiB in 0.954819 sec at 1.0 GiB/sec 268
IOPS
Now cluster 1 results are terrible, about 25% from before the upgrade.
ceph tell osd.0 bench -f plain
bench: wrote 1 GiB in blocks of 4 MiB in 4.03434 sec at 254 MiB/sec 63
IOPS
Ceph -s shows HEALTH_OK. Dashboard looks good. 2 pools
MON Dump
min_mon_release 14 (nautilus)
OSD Dump
require_min_compat_client luminous
min_compat_client jewel
require_osd_release nautilus
Not sure what is causing the slow performance. Ideas?
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