HP-UX iSCSI Software Initiator Support Guide (Edition 7)

Table 6 Software Interface Driver Statistics (continued)
Description of FieldCLiscsiutil Statistic
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).
The number of memory allocation attempts for a kernel driver
structure that failed. A failure to allocate the driver SCSI
DNumber of streams message allocation
failures
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).
The number of memory allocation attempts for a kernel driver
structure that failed. The iSCSI Software Initiator will retry the
DNumber of I/Os delayed while waiting for
resources
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).
Number of I/Os that got timed-out while waiting for memory.INumber of I/Os timed-out waiting for
resources
The number of SCSI I/Os that were aborted as a result of
retrying memory resource allocation when the connection went
DNumber of I/Os failed due to an offline
connection
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).
The number of SCSI I/Os that failed to acquire memory
resources within the maximum number of retries. As a result
DNumber of I/Os failed due to memory
resource constraints
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).
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
TNumber of invalid Data-In PDUs received
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/Os that failed with task aborted scsi status.II/Os got task aborted scsi status
Number of I/Os that got task aborted scsi status with incorrect
residual count. When there is a mismatch between the number
D/TI/Os with aborted scsi status got incorrect
residual count
of bytes received by the initiator and the number of bytes sent
by the target, it is considered as incorrect residual count.
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.
INumber of I/O underruns
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.
INumber of I/O underflows
The total number of I/Os on a connection where the target
sent more data than what was requested by the initiator. This
INumber of I/O overflows
56 iSCSI Software Interface Driver Statistics