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

Command Line User Interface 155
Command Line User Interface
Corrected Read Errors With Retry DISK-PORTS Specifies the counter counting the number of errors that
are corrected by applying retries. This counts errors
recovered, not the number of retries. If five retries were
required to recover one block of data, the counter
increments by one, not five. The counter is incremented
once for each logical block that is recovered using retries.
If an error is not recoverable while applying retries and is
recovered by ECC, it isn't counted by this counter; it will
be counted by the counter "Corrected Read Errors With
Delay".
Usage
Each of the read error counters provides a general
indication of the quality of read operations. Any
significant counts in any of the read error counters is an
indication that drive operational quality may be having an
effect on performance.
Corrected Write Errors With
Delay
DISK-PORTS An error code or algorithm (e.g., ECC, checksum) is
applied in order to get perfect data with substantial delay.
"With possible delay" means the correction took longer
than a sector time so that writing of subsequent sectors
was delayed (e.g., a lost revolution). The counter is
incremented once for each logical block that requires
correction. A block with a double error that is correctable
counts as one event and two different blocks corrected
during the same command count as two events.
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