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Bug #14052

Client io blocked when removing snapshot

Added by Kongming Wu over 8 years ago. Updated almost 7 years ago.

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

0%

Source:
other
Tags:
Backport:
Regression:
No
Severity:
3 - minor
Reviewed:
Affected Versions:
ceph-qa-suite:
Pull request ID:
Crash signature (v1):
Crash signature (v2):

Description

I used a rbd command to create a 6TB-size image, And then created a snapshot of this image. After that, I kept writing something like modifying files so the snapshots would be cloned one by one.
At this time, I did the fellow 2 ops simultaneously.
1. keep client io to this image.
2. excute a rbd snap rm command to delete snapshot.

Finally ,I found client io blocked for quite a long time. I used SATA disk to test, and felt that ceph makes it a priority to remove snapshot.

History

#1 Updated by Josh Durgin almost 7 years ago

  • Status changed from New to Resolved

The 'osd snap trim sleep' option provides a way to throttle back the impact of snapshot removal on the cluster.

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