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
113
Number of Data-In PDUs
received without data
I The total number of empty Data-In PDUs
received by the initiator.
Number of invalid R2T PDUs
received
T The total number of Request to Transfer
(R2T) PDUs from the target that had an
incorrect buffer offset or Data Transfer
Length in them. A non-zero value for this stat
indicates that the target is not adhering to the
error recovery policy negotiated by the
initiator.
Number of I/Os that failed to
respond to an R2T due to kernel
memory allocation failures
D The total number of Request to Transfer
(R2T) PDUs that could not be honored by the
initiator due to resource constraints at the
initiator. A non-zero value for this stat
indicates that the initiator is intermittently
running out of resources while handling iSCSI
I/O traffic.
Number of unexpected R2T
PDUs received during a Read
I/O
T The number of Request to Transfer (R2T)
requests sent by the target for a Read
operation. This is an unexpected behavior.
Number of unexpected Data-In
PDUs received during a Write
I/O
T The total number of data-in PDUs received by
the initiator while the initiator was doing a
write operation to the target. This is an
unexpected behavior.
Number of Data-In PDUs with
incorrect residual count
T The total number of I/O requests where the
target had an incorrect residual count value
and where the status for the I/O was sent as
part of the last Data-In PDU. This might
happen when the target indicated an
underflow condition but the residual count
value did not match the expected residual
count.
Number of SCSI Response PDUs
with incorrect residual count
T The total number of I/O requests where the
target had an incorrect residual count value
set. This might happen when the target
indicated an underflow condition but the
residual count value did not match the
expected residual count. The response PDU in
this case was sent as a separate PDU by the
target.
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.
Table D-1 Software Interface Driver Statistics (Continued)
iscsiutil Statistic CL Description of Field