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.
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.
- 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
...
- Status changed from In Progress to Resolved
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