Russell Coker <russell@coker.com.au> wrote:
4) Run ZFS for mail storage in the DomU and use something other than ZFS for the Dom0. This has the same performance problems as 3) but without the issue of different ZFS instances fighting about it. Also I would lose the support for hashes on the zvol data, I could use files on BTRFS for similar data integrity (I'm using RAID-1 so RAID-Z isn't an option and therefore the benefits of ZFS over BTRFS are fewer) but that would still give performance issues.
XFS doesn't have the fsck problem, but it isn't optimized for large numbers of small files, as I recall. I can't comment on reliability/performance. I don't know much about JFS either - XFS seems to be receiving more development attention from Red Hat and elsewhere at the moment. I don't think Reiser 3 is seeing much work anymore either.