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Bug #37490
closedceph-volume lvm list is O(n^2)
% Done:
0%
Source:
Tags:
Backport:
nautilus, mimic, luminous
Regression:
No
Severity:
3 - minor
Reviewed:
Affected Versions:
ceph-qa-suite:
Pull request ID:
Crash signature (v1):
Crash signature (v2):
Description
ceph-volume lvm list calls /sbin/lvs --noheadings --readonly --separator=";" -o lv_tags,lv_path,lv_name,vg_name,lv_uuid,lv_size once for each disk, lvs iterates over all the disk causing a total of n^2 disk accesses.
This is especially annoying if you have (partially) broken disks or if your disks are currently overloaded. I've seen this command take several minutes on some systems with only 24 disks under heavy IO load.
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