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

Command Line User Interface 179
Command Line User Interface
Total I/O ARRAY
LUN
The total number of host read and write commands
completed.
Usage
This metric is used as the basis to compute the Total I/O
Rate metric.
Total I/O Rate (1.05 release)
Total I/O Throughput (prior to
1.05)
ARRAY
LUN
The average number of host read and write commands
completed per second.
Usage
This metric is a measure of the performance level being
achieved and also provides some indication of the
demand level of the host workload. High total I/O rates
will not be achieved when the workload demand is low.
Total I/O Throughput (1.05
release)
MBytes Total Read/Write
Throughput (prior to 1.05)
ARRAY
LUN
The average number of megabytes transferred per second
by read and write commands.
Usage
This metric is a measure of the performance level being
achieved by the array also provides some indication of the
demand level of the host workload. High total throughput
will not be achieved when the workload demand is low.
This metric is computed from the Total Logical Blocks
Transferred Rate by converting logical blocks to
megabytes. The conversion factor is 2048 blocks per
megabyte.
Total Logical Blocks Transferred ARRAY
LUN
The total number of logical blocks transferred by host read
and write commands.
Usage
This metric is used as the basis to compute the Total
Logical Blocks Transferred Rate metric. In combination
with the Total I/O metric this metric can be used to
determine the average size of read and write commands
in the host workload.
Table 12 Performance Metrics (Continued)
Metric Categories Description/Usage