Monitoring performance
You can monitor system performance using Performance Monitor. For more information, see the Hitachi Virtual Storage Platform G200, G400, G600 Performance Guide.
You can monitor information on pools and DP-VOLs using Command Control Interface (CCI). For more information, see theCommand 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, the trend of pool usage rates, and the access load upon data drives) and DP-VOL load (including the access frequency and the trend of pool allocation rates). 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 property groups of pools (using Performance Monitor)
Pool usage and elapsed time of pool usage (using Hitachi Device Manager - Storage Navigator).
DP-VOL usage (stored data rates) and elapsed time of pool usage (using Hitachi Device Manager - 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 will move a DP-VOL.
The DP-VOL is copied using ShadowImage from a pool with an I/O bottleneck. For more information, see Hitachi ShadowImage® User Guide.
When normal volumes exist in the same parity group as the pool-VOL, Hitachi 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.