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

Command Line User Interface 151
Command Line User Interface
Table 12 Performance Metrics
Metric Categories Description/Usage
1 Hour Write Working Set
11 Hour Write Working Set
24 Hour Write Working Set
ARRAY
OPAQUE
The number of clusters that have been written
approximately within the time frame specified by the
metric.
Usage
AutoRAID attempts to keep the write working set in RAID
1+0 storage to provide the best random write
performance. These metrics are used by AutoRAID to
implement that policy.
Actual Temperature DISK-PORTS The temperature sensed in the disk at the time the Log
Sense command is performed, given in degrees Celsius
Usage
The comparison of the Actual Temperature with the
Maximum Operating Temperature indicates how close the
drive is to its operational limits.
Cache Pages Read ARRAY
LUN
The number of disk read commands used to partially or
fully fill read cache pages in response to host read
commands. Each disk read used to fill a read cache page
is counted as one cache page read independent of the
portion of a read cache page that it fills and independent
of whether the read cache page previously held cached
read data. Disk reads generated by array internal policy
operation are not counted as cache pages read.
Usage
The ratio of Read Cache Hits to (Read Cache Hits + Cache
Pages Read) gives a general indication of the effectiveness
of the read cache in servicing the host read workload.
Effectiveness is approximately proportional to the ratio.