[Bugs] [Bug 1203739] Self-heal of sparse image files on 3-way replica "unsparsifies" the image

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1203739



--- Comment #8 from Ravishankar N <ravishankar at redhat.com> ---
(In reply to Ben England from comment #6)
> So if sparse VM images are being used with Gluster, then
> this will matter because space will get used up fast by a self-heal.  Not
> only that but performance will suffer because self-heal will have to do a
> lot more I/O.
Hi Ben,
We have logic in AFR selfheal which will not write to the sink if the file is
sparse *and* the checksums of the data blocks (as it loops through all the
chunks of the file) is same on the source and sink(s). There is also a
possibility that the disk usage is different because the way XFS preallocation
works (See BZ 1277992). In any case I'm going to work with Sas to see if
comment#5 is repeatable and is related to gluster.

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