Load Balancing

If disk activities are heavily concentrated on one or a small number of disks in the storage subsystem, it may create bottlenecks. You can use the “Moving a Subdisk” and possibly the “Splitting a Subdisk” features to spread out disk accesses more evenly across all the disks to balance the load.

If a disk has High or Critical I/O activity (shown by a red or yellow pie symbol), you may consider moving one or more of its subdisks to another disk that shows below average I/O activity (shown by a blue pie symbol). The idea is to move just enough activity to achieve balance. A careful study of the statistics for the disk with Critical activity may identify the best subdisks to move. You should move subdisks only when a disk has High or Critical I/O activity over a prolonged period of time and performance is affected. Moving a subdisk to another disk has an effect on I/O as well, but it should be compensated for by the other disk having much lower I/O activity. You would need to look at the statistics after the subdisk move to see whether the move was effective in balancing the load.