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/Os failed due to an
offline connection
D The number of SCSI I/Os that were aborted as
a result of retrying memory resource
allocation when the connection went offline.
As a result of this event, the corresponding
SCSI I/O will be aborted. This could be a
network infrastructure problem. Failed I/Os
will be retried according to existing SCSI
retry policies (same as Fibre Channel and
parallel SCSI).
Number of I/Os failed due to
memory resource constraints
D The number of SCSI I/Os that failed to
acquire memory resources within the
maximum number of retries. As a result of the
memory allocation failures, the SCSI I/O was
failed backed to SCSI. Failed I/Os will be
retried according to existing SCSI retry
policies (same as Fibre Channel and parallel
SCSI).
Number of invalid Data-In
PDUs received
T The total number of invalid Data-In PDUs
sent by the target. A non-zero value for this
stat indicates that the target is not adhering
to the iSCSI protocol by not sending Data-In
PDUs with:
Buffer Offset in increasing offset order with
non-overlapping ranges.
DataSN in increasing order.
Number of I/O underruns I The number of I/Os on a connection where the
number of bytes that were received by the
initiator did not match the number of bytes
that the target sent.
Number of I/O underflows I The number of I/Os on a connection where the
target sent less data than what was requested
by the initiator. A large value for this statistic
is normal.
Number of I/O overflows I The total number of I/Os on a connection
where the target sent more data than what
was requested by the initiator. This indicates
that the Expected Data Transfer Length in
the I/O request was not sufficient.
Number of I/O failures due to
response code errors
T The total number of I/Os that failed due to a
response code error in the SCSI response
PDU. This means that the target failed to
execute the I/Os. A large value here could
indicate that the target is not functioning
properly.
Table D-1 Software Interface Driver Statistics (Continued)
iscsiutil Statistic CL Description of Field