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Table 4: iSCSI Driver Options (Continued) (Continued)
Parameter
Default Value
Minimum Value
Maximum Value
Description
ETO
90 seconds
0 seconds
3600 seconds
Extended timeout (ETO) in
seconds. This parameter
determines the amount of time the
UCNA driver waits for the target to
be available after it has lost
connection to the target during an
I/O operation.
Note: ETO values are configurable
via the Windows registry.
im_policy
2
0
4
The Interrupt Moderation policy
parameter controls the rate of
interrupts for the UCNA. For more
information, see "Interrupt
Moderation Policy Settings" below.
lqd
128
1
255
The LUN queue depth parameter
configures the number of
concurrent commands to a logical
unit via Storport API
StorPortSetDeviceQueueDepth.
The lqd parameter also sets the
maximum number of concurrent
commands allowed per LUN.
large_io
64
64
512
Maximum transfer size in a single
I/O request, in KB. By default, the
iSCSI driver supports a maximum of
64 KB of data and 16 scatter/gather
entries in a single I/O request. This
option enables support for 512 KB
of data in a single I/O request. If an
application issues an I/O request
that is larger than 64 KB or that
needs more than 16 scatter/gather
entries, the request is split into
multiple requests by the Storport
driver.
Note: If the large_io parameter is
set to 512, the amount of physical
memory consumed by the driver
increases. Also, although
intermediate values between 64
and 512 are accepted, the memory
used by the driver is the same as is
used if large_io is set to 512.
Emulex Drivers for Windows User Manual
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