[Gluster-users] XFS and MD RAID

[s19n]

* Brian Candler <B.Candler at pobox.com> [2012 08 29, 08:48]:
> In a test setup (Ubuntu 12.04, gluster 3.3.0, 24 x SATA HD on LSI Megaraid
> controllers, MD RAID) I can cause XFS corruption just by throwing some
> bonnie++ load at the array - locally without gluster.

Randomly found on Google:

http://www.jive.nl/nexpres/doku.php?id=nexpres:nexpres_wp8#tests_on_xfs_file_system

"It is our opinion that the normalization of XFS behavior on a 24 disks
array is due to some proprietary round-robin algorithm on the raid card
that caused during the tests on a 12 disks array a 'missing disk' signal
that slowed down the pace, even though some downfalls on the 24 disks
array still happen every 18/20 files written. We ought to say that the
downfall pattern is not related to time delays or file sizes, but it is
instead a peculiarity of the XFS file system."

 Now I'd _really_ like to know if you are using a Megaraid or, as you say
at the end, a mpt2sas controller/driver, because I am going to setup a
new gluster volume with them, and considering this issue and the ext4
one I don't really know what to choose...


Regards