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

178 Command Line User Interface
Total Cache Pages Accessed ARRAY
LUN
The total number of disk read and write commands used
to fetch and post data to and from the read and write
caches. It is a sum of the Cache Pages Read and Cache
Pages Written metrics. See the descriptions of those two
metrics for more detailed information. Disk read and
writes generated by array internal policy operation are
not counted as cache pages accessed.
Usage
The read and write caches employ different caching
policies so it is not very meaningful to analyze the
combined read and write cache effectiveness. See usage
information on the individual read and write cache metrics
for more information on analyzing cache effectiveness.
Total Corrected Read Errors DISK-PORTS The total of all correctable errors encountered. It is the sum
of the counters specified by "Corrected Read Errors With
Possible Delay" and "Corrected Read Errors With Retry".
There is no double counting of data errors among these
two counters and all correctable data errors are counted
in one of these counters.
Usage
Each of the write error counters provides a general
indication of the quality of write operations. Any
significant counts in any of the write error counters is an
indication that drive operational quality may be having an
effect on performance.
Total Corrected Write Errors DISK-PORTS The total of all correctable errors encountered. It is the sum
of the counters specified by "Corrected Write Errors With
Possible Delay" and "Corrected Write Errors With Retry".
There is no double counting of data errors among these
two counters and all correctable data errors are counted
in one of these counters
Usage
Each of the write error counters provides a general
indication of the quality of write operations. Any
significant counts in any of the write error counters is an
indication that drive operational quality may be having an
effect on performance.
Table 12 Performance Metrics (Continued)
Metric Categories Description/Usage