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Feature #3010

closed

Make it easy to find a list of data locations from a cephfs file

Added by Greg Farnum over 11 years ago. Updated over 11 years ago.

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

0%

Source:
Tags:
Backport:
Reviewed:
Affected Versions:
Pull request ID:

Description

Large cluster designers would like to be able to get as much information about a CephFS file's location as possible. Certainly it should include:
Each object used by the file
The PG of each object
The location of each PG.

Other bonuses might include making it easier to identify the object on-disk (the actual object file, not just the owner), so that they can see if a problem in a CephFS file is caused by a specific disk issue.

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 #1

Updated by Sage Weil over 11 years ago

  • Status changed from New to In Progress
  • Assignee set to Sage Weil

is this what they're after?

root@uml:~/mnt# /host/home/sage/src/ceph/src/cephfs foo map  |head
    FILE OFFSET                    OBJECT        OFFSET        LENGTH  OSD
              0      10000000000.00000000             0       4194304  osd.0
        4194304      10000000000.00000001             0       4194304  osd.0
        8388608      10000000000.00000002             0       4194304  osd.0
       12582912      10000000000.00000003             0       4194304  osd.0
       16777216      10000000000.00000004             0       4194304  osd.0
       20971520      10000000000.00000005             0       4194304  osd.0
       25165824      10000000000.00000006             0       4194304  osd.0
       29360128      10000000000.00000007             0       4194304  osd.0
       33554432      10000000000.00000008             0       4194304  osd.0
...

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 #2

Updated by Sage Weil over 11 years ago

  • Status changed from In Progress to Resolved
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