>> On Fri, 30 Apr 2010 14:07:56 -0400, Keith Arbogast <[email protected]> >> said:
> I'll redefine smaller, more plentiful TSM volumes for this pool, and > see if that keeps the sand out of my socks. Heh. :) Good luck. Don't go nuts with the "smaller" direction. There are major performance problems at the extremes. Unless you're running on something radically distributed like an XIV, you're going to want to keep the underlying spindles in mind. Every RAID group constitutes a contention domain. 100 processes trying to write to the same RAID5 is similar to 100 processes trying to write to the same spindle. In fact, they _are_ all trying to write to the same spindle, times the number of spindles in your group. If you don't have some other force guiding your decision, I'd suggest a one-digit number of volumes per contention domain. Maybe even less than 5. - Allen S. Rout
