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Fix #5048

krbd: limit of ~230 mapped images at once

Added by Sage Weil over 7 years ago. Updated about 7 years ago.

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

0%

Source:
other
Tags:
Backport:
Reviewed:
Affected Versions:
ceph-qa-suite:
Pull request ID:
Crash signature:

Description

this is just because we are using our major/minor device ids in a stupid way, iirc.

History

#1 Updated by Nathan O'Sullivan about 7 years ago

A user on IRC had a problem with iostat related to this:

  1. iostat
    [snip]
    rbd3 0.02 0.07 0.00 676 0
    emcpowerig 0.02 0.07 0.00 676 0
  1. cat /proc/diskstats
    [snip]
    248 0 rbd3 169 0 1352 104 0 0 0 0 0 104 104
    247 0 rbd4 169 0 1352 100 0 0 0 0 0 100 100

Both 'emcpowerig' and rbd4 were using 247:0 , resulting in iostat giving weird output. This would not have happened if RBD incremented the minor device ID instead of decrementing the major.

#2 Updated by Sage Weil about 7 years ago

  • Tracker changed from Bug to Fix

#3 Updated by Sage Weil about 7 years ago

  • Target version set to v0.75

#4 Updated by Sage Weil about 7 years ago

  • Status changed from New to In Progress

#5 Updated by Sage Weil about 7 years ago

  • Assignee set to Ilya Dryomov

#6 Updated by Sage Weil about 7 years ago

  • Status changed from In Progress to Resolved

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