Monitoring performance

You can monitor system performance using Performance Monitor. For more information, see the Performance Guide.

You can monitor information on pools and DP-VOLs using Command Control Interface (CCI). For more information, see the Command Control Interface User and Reference Guide.

The following activities help you to monitor and control performance of the DP-VOL. Collecting monitor information and subsequent tuning may increase throughput and the operating rates.

• Collecting monitor information.

Collecting the following monitor information helps you determine the pool load (including the access frequency, and the access load upon data drives) and DP-VOL load (including the access frequency). You can then use this monitor information to tune the appropriate allocation.

• Access frequency of DP-VOL, read hit rates, and write hit rates (using Performance Monitor)

• Usage rates of parity groups of pools (using Performance Monitor)

• Pool usage (using Device Manager - Storage Navigator)

• DP-VOL usage (using Device Manager - Storage Navigator)

• Dynamic Tiering performance monitoring of pool storage

• Possible tuning actions (without Dynamic Tiering).

The following techniques using ShadowImage or Tiered Storage Manager will move a DP-VOL:

• The DP-VOL is copied using ShadowImage from a pool with an I/O bottleneck. For more information, see the ShadowImage User Guide.

• When normal volumes exist in the same parity group as the pool-VOL, Tiered Storage Manager can be used to move the normal volume to another parity group that is not shared with a pool-VOL.

• ShadowImage copies a DP-VOL with a high I/O load to a pool with a lower access level to adjust the pool load.