4 Sep
1998
4 Sep
'98
11:16 p.m.
On Fri, 4 Sep 1998, Dave Hitz wrote:
Seriously, you actually get a double benefit from having smaller RAID groups. The first benefit, of course, is that the chances of losing two disks out of 14 is less than the chances of losing two disks out of 26.
And furthermore, is there any reason that those two raid groups should be equal size? Does the OS distribute the load evenly amongst raid groups, or does it weigh them based on disks, etc?
We experimented with writing to just one RAID group at a time, but that lead to performance problems when one of the RAID groups was small, so now we distribute over all RAID groups in a volume to maintain performance.
Dave