[lustre-discuss] OST partition sizes

[Mohr Jr, Richard Frank (Rick Mohr)]

> On Apr 28, 2015, at 4:05 PM, Patrick Farrell <paf at cray.com> wrote:
> 
> For ldiskfs OSTs, I believe the most common configuration is RAID 6 with 8 disks (6+2 parity) with whatever disk size you're using.

Actually, it is probably more like 8+2 RAID6 with 128 KB chunk size (so that a 1 MB I/O request fits nicely across 1 RAID stripe)

--
Rick Mohr
Senior HPC System Administrator
National Institute for Computational Sciences
http://www.nics.tennessee.edu