HP StorageWorks XP12000 HP StorageWorks XP Disk Array Configuration Guide: IBM - Page 17

Displaying the device parameters using the AIX command line, Required Value, Default Value, Parameter

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Parameter Queue type Default Value None Required Value Simple Table 5 Device parameters-queue depth Parameter Recommended Value Queue depth per LU 32 Queue depth per port (MAXTAGS) 1024 The recommended queue depth settings may not provide the best I/O performance for your system. You can adjust the queue depth setting to optimize the I/O performance of the disk array. Displaying the device parameters using the AIX command line At the command line prompt, enter lsattr -E -l hdiskx, where hdiskx is the device file name. Example # lsattr -E -l hdisk2 Changing the device parameters using the AIX command line 1. To change the R/W timeout parameter, enter: chdev -1 hdiskx -a rw_timeout='60' 2. To change the queue depth parameter, enter: chdev -l hdiskx -a queue_depth='x'. where x is a value from the above table. 3. To change the queue type parameter, enter: chdev -l hdiskx -a q_type='simple' Example # chdev -l hdisk3 -a queue_depth='2' This changes the queue depth for device hdisk3. 4. Verify that the parameters for all devices were successfully changed. Example # lsattr -E -l hdisk3 XP Disk Array Configuration Guide for IBM AIX 17

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Required Value
Default Value
Parameter
Simple
None
Queue type
Table 5 Device parameters-queue depth
Recommended Value
Parameter
32
Queue depth per LU
1024
Queue depth per port (MAXTAGS)
The recommended queue depth settings may not provide the best I/O performance for your system.
You can adjust the queue depth setting to optimize the I/O performance of the disk array.
Displaying the device parameters using the AIX command line
At the command line prompt, enter
lsattr -E -l hdiskx
, where
hdiskx
is the device file name.
Example
# lsattr
–
E -l hdisk2
Changing the device parameters using the AIX command line
1.
To change the R/W timeout parameter, enter:
chdev
–
1 hdiskx
–
a rw_timeout='60'
2.
To change the queue depth parameter, enter:
chdev
–
l hdiskx
–
a queue_depth='x'
.
where
x
is a value from the above table.
3.
To change the queue type parameter, enter:
chdev
–
l hdiskx
–
a q_type='simple'
Example
# chdev
–
l hdisk3
–
a queue_depth='2'
This changes the queue depth for device hdisk3.
4.
Verify that the parameters for all devices were successfully changed.
Example
# lsattr
–
E
–
l hdisk3
XP Disk Array Configuration Guide for IBM AIX
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