Avago Technologies 3ware SAS 9750-16i4e - Manual (Page 122)

Chapter 7. Configuring Units
110 3ware SATA+SAS RAID Controller Card Software User Guide, Version 10.2
7 When you are finished making changes, press F8 to save them and exit
3BM.
Enabling and Disabling Queuing for a Unit
Some drives support command queuing, a feature that can result in increased
performance for applications that require a lot of random access of data
(usually server-type applications). This is accomplished by causing command
reordering to be done on the drive.
In order to make use of command queuing, the feature must be enabled at both
the drive and the controller. You can enable support for command queuing on
a per-unit basis, as described below.
You can see whether command queuing is supported and enabled for a
particular drive in the Drive Details window. For details, see “Drive Details
window” on page 197.
To enable or disable queuing for a unit through 3DM2
1 Choose Management >> Controller Settings from the menu bar in
3DM2.
2 In the Unit Policies section of the Controller Settings page, enable
queuing by checking the box under “Queuing” for the designated unit;
disable it by unchecking the box.
The page refreshes, and a message at the top confirms the change that you
have made.
To enable or disable queuing for a unit through 3BM
1 At the main 3BM screen, select the unit by highlighting it and pressing Enter .
An asterisk appears in the left-most column to indicate that it is selected.
2 Tab to the Maintain Unit button and press Enter .
3 On the pop-up menu, select Configure and press Enter .
4 In the Configure Disk Array screen, Tab to the field Drive Queuing
Mode .
5 Press Enter to display the choices, use the arrow keys to select the setting
you want (Enabled or Disabled), and press Enter again to choose it.
Note: Not all drives support command queuing. If a drive does not support
command queuing, the policy setting for the controller is ignored. Queuing
information for SAS is not available.