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Feature #2003
closedlimit XFS extent fragmentation for rbd
Status:
Rejected
Priority:
Normal
Assignee:
-
Category:
librbd
Target version:
-
% Done:
0%
Source:
Tags:
Backport:
Reviewed:
Affected Versions:
Pull request ID:
Description
A user with the handle pmjdebruijn was asking earlier today about XFS extent fragmentation due to ceph writes on the freenode xfs channel. We should look into this for testing at some point.
We can use xfs_bmap to examine the extent ranges. Sample output from the user is here:
Suggestions from Christoph Hellwig are to use 512 byte inodes and set rbd_writeback_window to a large value. Sounds like typically there should be no more than 2-3 extent ranges for files of that size and the user is seeing 8.
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