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Bug #38582

open

Pool storage MAX AVAIL reduction seems higher when single OSD reweight is done

Added by Nokia ceph-users about 5 years ago. Updated about 5 years ago.

Status:
New
Priority:
Normal
Assignee:
-
Category:
-
Target version:
-
% Done:

0%

Source:
Tags:
Backport:
Regression:
No
Severity:
3 - minor
Reviewed:
Affected Versions:
Ceph - v11.2.0
ceph-qa-suite:
Component(RADOS):
Pull request ID:
Crash signature (v1):
Crash signature (v2):

Description

i have a 5 node ceph 11.2.0 cluster with 335 osds. Each OSD is a 4TB HDD. It has one EC 4+1 pool.

Due to high storage in the cluster, I did a "ceph osd reweight" on the OSD which had was in near-full state. I gradually reduced the weight from 1 to 0.93. After that, we noticed that the pool's MAX AVAIL value had dropped by ~40TB.
I understand that reweighting the OSDs will affect the available storage values. But i am not sure if it is normal to see a high drop since the OSD that i re-weighted was only of 4TB? Wouldn't the drop be lesser/equal to 4TB or is that not the correct calculation?
Is there any other information i should add?

Files

Download all files
osd-dump.txt (80.8 KB) osd-dump.txt Nokia ceph-users, 03/20/2019 12:05 PM
osd-tree.txt (21.8 KB) osd-tree.txt Nokia ceph-users, 03/20/2019 12:05 PM
crush_map_decompressed (16.2 KB) crush_map_decompressed Nokia ceph-users, 03/20/2019 12:05 PM
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