Paul / All
I'm not sure what warning your are referring to, I'm on Nautilus. The point
I'm getting at is if you weight out all OSD on a host with a cluster of 3
OSD hosts with 3 OSD each, crush rule = host, then write to the cluster, it
*should* imo not just say remapped but undersized / degraded.
See below, 1 out of the 3 OSD hosts has ALL it's OSD marked out and weight
= 0. When you write (say using FIO), the PGs *only* have 2 OSD in them (UP
set), which is pool min size. I don't understand why it's not saying
undersized/degraded, this seems like a bug. Who cares that the Acting Set
has the 3 original OSD in it, the actual data is only on 2 OSD, which is a
degraded state
root@hostadmin:~# ceph -s
cluster:
id: 33d41932-9df2-40ba-8e16-8dedaa4b3ef6
health: HEALTH_WARN
application not enabled on 1 pool(s)
services:
mon: 1 daemons, quorum hostmonitor1 (age 29m)
mgr: hostmonitor1(active, since 31m)
osd: 9 osds: 9 up, 6 in; 100 remapped pgs
data:
pools: 1 pools, 100 pgs
objects: 520 objects, 2.0 GiB
usage: 15 GiB used, 75 GiB / 90 GiB avail
pgs: 520/1560 objects misplaced (33.333%)
100 active+clean+remapped
root@hostadmin:~# ceph osd tree
ID CLASS WEIGHT TYPE NAME STATUS REWEIGHT PRI-AFF
-1 0.08817 root default
-3 0.02939 host hostosd1
0 hdd 0.00980 osd.0 up 1.00000 1.00000
3 hdd 0.00980 osd.3 up 1.00000 1.00000
6 hdd 0.00980 osd.6 up 1.00000 1.00000
-5 0.02939 host hostosd2
1 hdd 0.00980 osd.1 up 0 1.00000
4 hdd 0.00980 osd.4 up 0 1.00000
7 hdd 0.00980 osd.7 up 0 1.00000
-7 0.02939 host hostosd3
2 hdd 0.00980 osd.2 up 1.00000 1.00000
5 hdd 0.00980 osd.5 up 1.00000 1.00000
8 hdd 0.00980 osd.8 up 1.00000 1.00000
root@hostadmin:~# ceph osd df
ID CLASS WEIGHT REWEIGHT SIZE RAW USE DATA OMAP META AVAIL
%USE VAR PGS STATUS
0 hdd 0.00980 1.00000 10 GiB 1.7 GiB 765 MiB 12 KiB 1024 MiB
8.2 GiB 17.48 1.03 34 up
3 hdd 0.00980 1.00000 10 GiB 1.7 GiB 765 MiB 12 KiB 1024 MiB
8.2 GiB 17.48 1.03 36 up
6 hdd 0.00980 1.00000 10 GiB 1.6 GiB 593 MiB 4 KiB 1024 MiB
8.4 GiB 15.80 0.93 30 up
1 hdd 0.00980 0 0 B 0 B 0 B 0 B 0 B 0 B
0 0 0 up
4 hdd 0.00980 0 0 B 0 B 0 B 0 B 0 B 0 B
0 0 0 up
7 hdd 0.00980 0 0 B 0 B 0 B 0 B 0 B 0 B
0 0 100 up
2 hdd 0.00980 1.00000 10 GiB 1.5 GiB 525 MiB 8 KiB 1024 MiB 8.5
GiB 15.13 0.89 20 up
5 hdd 0.00980 1.00000 10 GiB 1.9 GiB 941 MiB 4 KiB 1024 MiB 8.1
GiB 19.20 1.13 43 up
8 hdd 0.00980 1.00000 10 GiB 1.6 GiB 657 MiB 8 KiB 1024 MiB 8.4
GiB 16.42 0.97 37 up
TOTAL 90 GiB 15 GiB 6.2 GiB 61 KiB 9.0 GiB 75 GiB
16.92
MIN/MAX VAR: 0.89/1.13 STDDEV: 1.32
Tarek Zegar
Senior SDS Engineer
Email tze...@us.ibm.com
Mobile 630.974.7172
From: Paul Emmerich <paul.emmer...@croit.io>
To: Tarek Zegar <tze...@us.ibm.com>
Cc: Ceph Users <ceph-users@lists.ceph.com>
Date: 06/07/2019 05:25 AM
Subject: [EXTERNAL] Re: [ceph-users] Reweight OSD to 0, why doesn't
report degraded if UP set under Pool Size
remapped no longer triggers a health warning in nautilus.
Your data is still there, it's just on the wrong OSD if that OSD is still
up and running.
Paul
--
Paul Emmerich
Looking for help with your Ceph cluster? Contact us at https://croit.io
croit GmbH
Freseniusstr. 31h
81247 München
www.croit.io
Tel: +49 89 1896585 90
On Thu, Jun 6, 2019 at 10:48 PM Tarek Zegar <tze...@us.ibm.com> wrote:
For testing purposes I set a bunch of OSD to 0 weight, this correctly
forces Ceph to not use said OSD. I took enough out such that the UP set
only had Pool min size # of OSD (i.e 2 OSD).
Two Questions:
1. Why doesn't the acting set eventually match the UP set and simply
point to [6,5] only
2. Why are none of the PGs marked as undersized and degraded? The data is
only hosted on 2 OSD rather then Pool size (3), I would expect a
undersized warning and degraded for PG with data?
Example PG:
PG 1.4d active+clean+remapped UP= [6,5] Acting = [6,5,4]
OSD Tree:
ID CLASS WEIGHT TYPE NAME STATUS REWEIGHT PRI-AFF
-1 0.08817 root default
-3 0.02939 host hostosd1
0 hdd 0.00980 osd.0 up 1.00000 1.00000
3 hdd 0.00980 osd.3 up 1.00000 1.00000
6 hdd 0.00980 osd.6 up 1.00000 1.00000
-5 0.02939 host hostosd2
1 hdd 0.00980 osd.1 up 0 1.00000
4 hdd 0.00980 osd.4 up 0 1.00000
7 hdd 0.00980 osd.7 up 0 1.00000
-7 0.02939 host hostosd3
2 hdd 0.00980 osd.2 up 1.00000 1.00000
5 hdd 0.00980 osd.5 up 1.00000 1.00000
8 hdd 0.00980 osd.8 up 0 1.00000
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