User Manual

Using the RAID GUI
2-30
• Delete logical disks
Select the logical disk(s) you want to delete and click Delete. To delete all
LUNs of dgxldy, check the ‘Force to delete LUN mapping(s)’ box. All
access to the logical disk will be stopped.
• Modify logical disks
To modify a setting, select an LD and click Modify. Specify the following
options for configuration.
Alignment
Offset (sector)
Set the alignment offset for the logical disk starting
sector to enhance the controller’s performance.
For Windows OS, it is suggested to set the
alignment offset at sector 63.
Note
Make sure the disk group to be created for a new logical disk is in
OPTIMAL or LD_INIT state, otherwise the new logical disk will not be
created.
Name Type a name for the DG ID/ LD ID.
Preferred
Controller
This option is only available when the redundant-
controller system is in use. Select the preferred
controller to be in charge of managing and
accessing the logical disk. However, the controller
ownership will not change unless you check the
‘Change owner controller immediately’ box.
Write Cache This option enables or disables the write cache of
a logical disk.
Write Sorting This option enables or disables the sorting in the
write cache. To improve writing performance, it is
recommended to turn this option on for random
access. This option is available only if the write
cache is on.
Read Ahead
Policy
Always: The controller performs pre-fetching data
for every read command from hosts.
Adaptive: The controller performs pre-fetching
only for host read commands that are detected
as sequential reads. The detection is done by read
logs.
Off: If there is no sequential read command, read-
ahead will result in overhead, and you can disable
the read-ahead.