HP XP20000/XP24000 HP StorageWorks XP Disk Array Configuration Guide (T5278-96 - Page 108
Changing the device parameters using SMIT, Displaying the device parameters using the AIX command line
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Table 24 Device parameters-queue depth (IBM AIX) Parameter Queue depth per LU Queue depth per port (MAXTAGS) Recommended Value 32 1024 The recommended queue depth settings might 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 previous table. 3. To change the queue type parameter, enter: chdev -l hdiskx -a q_type='simple' For example, enter the following command to change the queue depth for the device hdisk3: # chdev -l hdisk3 -a queue_depth='2' 4. Verify that the parameters for all devices were successfully changed. For example, enter the following command to verify the parameter change for the device hdisk3: # lsattr -E -l hdisk3 5. Repeat these steps for each OPEN-x device on the disk array. TIP: The lsattr command also shows useful information, such as LUN ID of the mapped LDEV, worldwide name of the disk array FC port, and N-Port ID. Another useful command for determining the slot position and port worldwide name of the FCA is the lscfg -v -l hdiskx command. Changing the device parameters using SMIT 1. Start SMIT. (Optional) For an ASCII session, use the smit -C command. 2. Select Devices. Example System Management Move cursor to desired item and press Enter. Software Installation and Maintenance Software License Management Devices System Storage Management (Physical & Logical Storage) 108 IBM AIX
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