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Queue Depth
(-p qd)
This parameter specifies maximum permissive I/O command number to queue per LU on the target device.
Since each target device have a maximum permissive I/O command number, so check the specification of
the target device.
(Example) If 17 LUs are used on a target device and the device has a port that can queue maximum 512
commands per second, and 4 systems are using the device. See the figure below.
The maximum number of the I/O available for queuing per LU is calculated with the following formula:
(Max. value of the I/O queuing number) ÷(Number of LUs connected)
In this situation: divide 512 by 17 is 30.11... Therefore, 30 or lower value should be set to this parameter.
System#0
System#1
Adapter#0
Fibre Channel Switch
Disk Device
LU0
LU1
LU2
LU3
LU4
System#0
Interrupt Type
(-p ir) [Linux only]
This parameter specifies interrupt mode. The parameter is set to the optimum value for a general purpose,
so usually this parameter does not need to be changed.
In Windows, this parameter cannot be set. In Windows Server 2008 R2 or lower Windows version, the
driver runs with INT, and in Windows Server 2012 and Windows Server 2012 R2, the driver runs with MSI-
X.
Refer to the table below for the descriptions of the diplayed values.
Displayed value
Linux
Windows
Legacy Mode
INT
MSI Mode
MSI
MSI-X Mode
MSI-X
<Notice: when logical device name is used>
If 2G/4G/8G Fibre Channel Adapters is used and a logical device name is specified, all ports on the Fibre
Channel Adapter that contains the logical device is set to use the specified value. If 16G Fibre Channel
Adapter is used, only specified device is set to use the specified value.
System#2
Adapter#0
Adapter#0
Port#0
LU0
LU0
LU1
LU1
LU2
LU2
System#1
LU3
System#2
System#3
Description
Legacy interrupts
Message Signaled Interrupts (MSI)
Message Signaled Interrupts (MSI-X)
System#3
Adapter#0
LU0
LU1
LU2
LU3
LU4
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