HP StorageWorks Command View SDM Installation and User Guide (T1086-96023, February 2005)

Command Line User Interface 175
Command Line User Interface
Read Cache Size (absolute) ARRAY The capacity of memory allocated to the read cache (in
Kbytes).
Usage
The capacity of the read cache is based on the amount of
memory installed in the controllers. If other metrics
indicate the read cache is not effectively servicing the host
read workload, it may be possible to increase
performance by installing more controller memory.
Read Commands DISK The number of read commands issued to the disk.
Usage
This metric for all the disks can be compared to determine
if there is an imbalance in the workload that is causing a
single disk or a small set of disks to be a performance
limitation. The array attempts to spread the workload
evenly across all the disks but certain workload patterns
could possibly defeat this process.
Table 12 Performance Metrics (Continued)
Metric Categories Description/Usage