Monitoring performance
You can monitor system performance using Performance Monitor. For more information, see the Performance Manager User Guide .
You can monitor information on pools and DP-VOLs using RAID Manager. For more information, see theRAID Manager User Guide.
The following activities help you to monitor and control performance of the DP-VOL. Collecting monitor information and subsequent tuning can increase throughput and 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 Storage Navigator).
DP-VOL usage (using Storage Navigator).
Dynamic Tiering performance monitoring of pool storage
Possible tuning actions (without Dynamic Tiering). The following techniques using ShadowImage or Hitachi Tiered Storage Manager move a DP-VOL.
The DP-VOL is copied using ShadowImage from a pool with an I/O bottleneck. For more information, see ShadowImage User Guide.
When normal volumes exist in the same parity group as the pool-VOL, Hitachi Tiered Storage Manager can 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.