HP-UX iSCSI Software Initiator Support Guide, HP-UX 11i v1 and 11i v2, July 2005

Appendix D

iSCSI Software Interface Driver Statistics

106

iSCSI Software Interface Driver Statistics

Statistics are maintained in the iSCSI Software Interface Driver (SWD). These statistics are explained in

Table D-1, “Software Interface Driver Statistics,” on page 107.

The Class column (CL) provides message classification. Messages can be informational (I), target errors (T),

transient driver errors (D), or connectivity problems (C).

Informational Messages are counters for driver events. They are not an indication of an error, but should

an error occur, they may provide some profiling information.

Target Errors are detected at the initiator and should be reported to HP and/or the target vendor. Not all

target errors are reported on the host side. It is the responsibility of the system administrator to monitor any

device specific logs for target issues.

Transient Driver Errors will typically occur when some resource, for example, memory, is in short supply,

or something is not configured correctly. The error is considered transient, because a retry of the operation,

or a correct re-configuration, would typically be successful. I/Os that experience transient errors will be

retried, so no data will be lost. Control operations such as an application open, or a task management

command, may not be retried (the determination to retry is left to the application or to the administrator). If

the system resource load is increased, a small value for a transient driver error statistic may be an indication

of problems . Larger values for the transient driver error statistic will start to impact performance.

Connectivity Problems will typically be network or target availability problems. Connectivity problems

are transient in the sense that a network infrastructure engineer can resolve the problem and I/O traffic will

resume as before.