On Fri, Apr 28, 2017 at 1:39 PM, Peter Grandi <p...@btrfs.list.sabi.co.uk> 
wrote:


> In a particularly demented setup I had to decastrophize with
> great pain a Zimbra QCOW2 disk image (XFS on NFS on XFS on
> RAID6) containining an ever growing number Maildir email archive
> ended up with over a million widely scattered microextents:
>
>   http://www.sabi.co.uk/blog/1101Jan.html?110116#110116

Related Btrfs thread "File system corruption, btrfsck abort" involves
5 concurrent use VM's with guests using ext4, NTFS, HFS+, Btrfs, LVM,
pointing to qcow2 files on Btrfs for backing. And it's resulting in
problems...


-- 
Chris Murphy
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