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

158 Command Line User Interface
Link Failure Count FRONTEND-
PORT,
BACKEND-
PORT
The number of times a NOS primitive sequence or another
failure of N_Port initialization protocol caused a transition
into the link failure state.
Usage
Each of the port error counters provides a general
indication of the quality of port operation. Any significant
counts in any of the port error counters is an indication
that port or link operational quality may be having an
effect on performance.
Compatibility
FRONTEND-PORT metrics are available for all products.
BACKEND-PORT are available for VA 7410 only.
Logical Blocks Read ARRAY
LUN
The total number of logical blocks transferred by host read
commands.
Usage
This metric is used as the basis to compute the Logical
Blocks Read Rate metric. In combination with the Host
Reads metric this metric can be used to determine the
average size of read commands in the host read
workload.
Logical Blocks Read Rate (1.05
release)
Logical Blocks Read Throughput
(prior to 1.05)
ARRAY
LUN
The average number of logical blocks transferred per
second by read commands.
Usage
This metric is a measure of the performance level being
achieved for reads and also provides some indication of
the demand level of the host workload. High read
throughput will not be achieved when the workload
demand is low.
Logical Blocks Written ARRAY
LUN
The total number of logical blocks transferred by host write
commands.
Usage
This metric is used as the basis to compute the Logical
Blocks Written Rate metric. In combination with the Host
Writes metric this metric can be used to determine the
average size of write commands in the host write
workload.
Table 12 Performance Metrics (Continued)
Metric Categories Description/Usage