[Lustre-discuss] OST RAID sets

[Jon Tegner]

Hi,

rather new to lustre, and read the following in the manual:

"For better performance, we recommend that you create RAID sets with 4 
or 8 data disks plus one or two parity disks."

We were experimenting with OSTs with 6 disks, and tried raid set of both 
4 and 5 disks (raid5). While testing for performance we didn't notice 
any difference (4 was not noticeable faster than 5), so just wondering 
if there are any references where the performance advantage of 4 or 8 
data disks are verified.

Thanks!

/jon