On 03/28/2012 02:04 PM, Radim Kolar wrote:
RAID0 would help me use more efficiently the total disk space
available at each node, but tests have shown that under write load it
behaves much worse than using separate data dirs, one per disk.
there are different strategies how RAID0 splits reads, also changing
io scheduler and filesystem helps. I found that ZFS/ZRAID is best,
especially backups are very good. If you dont plan to do backups ext4
is not bad either, but compactions are rather slow on it.
I'm also trying to evaluate different strategies for RAID0 as drive for
cassandra data storage. If I need 2T space to keep node tables, which
drive configuration is better: 1T x 2drives or 500G x 4drives? Which
stripe size is optimal? Should I use hardware raid or linux raid is ok?
I mostly concerned with read performance.
