[Gluster-users] Sparse Files and Heal

[Lindsay Mathieson]

On Sat, 22 Nov 2014 12:14:57 AM you wrote:
> Lindsay,
> 
> Could you clarify your method of healing the vm-images?
> Did you use full heal, and once the heal completed, you switched to diff and
> let it finish?
> By the end, both bricks would consist of images with identical file sizes?

There's a story there ...

Initially it was diff, whch wasa problem as I had 8 VM images being healed 
which killed the cpu on the 2 nodes.

I moved the VM's to one node, changed it to full and rebooted. That restored 
performance.

But all my VM's are sparse allocated, on at 512GB with only 33GB used. I 
noticed the file being healed had increased in real size to 200GB - obviously 
the heal process wasn't catering to sparse files.

I switched back to diff and that stopped the real file size increase and 
eventually the heal completed (overnight). Unfortunately the real file sizes 
remained different - 512GB allocated on both bricks, but du showed ther 
original was still 33GB whereas the healed one was 200GB.


I somewhat naively tried to force a resync by deleting the healed file on disk 
and starting a heal. Heal reported the file as being healed, but it finished 
much to quickly and the file on node 2 was not there. Disconcertingly, the 
file showed on the gluster mount on node 1, but not on the gluster mount on 
node 2. 


In the end I deleted it and restored from backups.

-- 
Lindsay
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