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
110
Number of streams message
duplication failures
D The number of streams message duplication
operations that failed. As a result of the
failure, the iSCSI Software Initiator will not
transmit the related iSCSI commands. 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 PDU exchange
timeouts
D/C/T The number of iSCSI PDUs successfully
transmitted to the target for which no
response was received within a specified
period of time. If a timeout occurs, the iSCSI
Software Initiator will initiate a logout for the
session as part of the recovery, and eventually
will attempt to login again with the target.
The problem could be a network
infrastructure problem or a target congestion
issue. 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 PDU exchanges
aborted
C/T The number of iSCSI PDUs that were aborted
by the initiator while waiting for a response
from a target. The abort occurs if a response
to the iSCSI PDU has not been received at the
initiator within a preset timeout period. The
failure can also be due to an unexpected close
of the TCP connection. The problem could be
a network infrastructure problem or a target
congestion issue.
Number of PDU exchanges
abandoned
D/T The number of exchanges between an iSCSI
initiator and target that were abandoned.
This will typically occur when the number of
exchanges to complete a negotiation goes
beyond a predetermined limit, usually
indicating an infinite loop.
Number of I/Os issued on this
connection
I The number of SCSI I/Os that were sent to the
networking stack by the iSCSI Software
Initiator.
Table D-1 Software Interface Driver Statistics (Continued)
iscsiutil Statistic CL Description of Field