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

Appendix D
iSCSI Software Interface Driver Statistics
iSCSI Software Interface Driver Statistics
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Number of I/O timeouts D/T The number of SCSI I/Os that did not
complete within a time period preset by an
upper level protocol (SCSI). The driver will
recover from SCSI I/O timeouts using session
level error recovery, for example, tearing
down the session and starting over. Failed
I/Os will be retried according to existing SCSI
retry policies (same as Fibre Channel and
parallel SCSI).
Number of kernel memory
allocation failures
D The number of kernel memory allocation
failures for SCSI I/O related data structures.
Failure to allocate will result in the I/O not
being processed and returned to the SCSI
layer. The regular occurrence of this event
will have a negative impact on performance.
Failed I/Os will be retried according to
existing SCSI retry policies (same as Fibre
Channel and parallel SCSI).
Number of streams message
allocation failures
D The number of memory allocation attempts
for a kernel driver structure that failed. A
failure to allocate the driver SCSI structure
means that some SCSI I/O could not be
completed. The regular occurrence of this
event will have a negative impact on
performance. Failed I/Os will be retried
according to existing SCSI retry policies
(same as Fibre Channel and parallel SCSI).
Number of I/Os delayed while
waiting for resources
D The number of memory allocation attempts
for a kernel driver structure that failed. The
iSCSI Software Initiator will retry the
allocation request a set number of times. The
ultimate failure to allocate the driver
structure means that some SCSI I/O could not
be completed. The regular occurrence of this
event will have a negative impact on
performance. Failed I/Os will be retried
according to existing SCSI retry policies
(same as Fibre Channel and parallel SCSI).
Table D-1 Software Interface Driver Statistics (Continued)
iscsiutil Statistic CL Description of Field