Select the appropriate array.
Choose Configuration > Custom Configure.
NOTE: This selection is inactive unless you have selected a
controller with available physical drives.
Select Add LDs/LVs to the Current Configuration from the Custom
Configuration Options window.
Verify that the server and controller displayed at the top of the
window are correct.
Select a disk you want to be included in the new logical drive and
click Add Disk.
If you make a mistake or change your mind, select the drive in the
participating drives list and click Remove Disk.
Select a RAID level. For definitions of the RAID levels, see RAID
Levels.
Select the Host channel and ID to which you would like your new logical
drive to be mapped to from the Channel and the ID list
boxes.
Set the Max Drive Size.
The Max Drive Size displays the total capacity of each disk.
A smaller logical drive can be created by decreasing this value.
NOTE: If you do not change the Max Drive Size but you
do change the Partition Size, a new partition is created at
the specified partition size. Remaining capacity can be used later
by expanding the drive (as explained in
Expanding the Capacity of a Logical Drive). The drive capacity
is no longer editable after a partition is created.
To use the logical drive immediately, select On-line Initialization.
Because logical drive initialization can take up to several hours,
you can choose to initialize a logical drive on-line. On-line initialization
enables you to begin configuring and using the logical drive before
initialization is complete. However, because the controller is building
the logical drive while performing I/O operations, initializing a
logical drive on-line requires more time than off-line initialization.
If you do not select On-line initialization, you can configure and
use the drive only after initialization is complete. Because the controller
is building the logical drive without having to also perform I/O operations,
off-line initialization requires less time than on-line initialization.
NOTE: On-line Initialization does not apply to logical
volumes.
Select the Stripe Size.
Select Default to assign the stripe size per Optimization
mode as specified in the default stripe size table shown in Changing
Controller Parameters - Cache tab, or select a different stripe
size.
Once the stripe size is selected and
data is written to logical drives, the only way to change the stripe size
of an individual logical drive is to back up all its data to another location,
delete the logical drive, and create a logical drive with the stripe size
that you want.
Specify Default, Write-through, or Write-back
as the Write Policy for the logical drive.
The write policy determines when cached data is written to the disk
drives. The ability to hold data in cache while it is being written
to disk can increase storage device speed during sequential reads.
Write policy options include write-through and write-back.
Using write-through cache, the controller writes the data to the
disk drive before signaling the host OS that the process is complete.
Write-through cache has lower write operation and throughput performance
than write-back cache, but it is the safer strategy, with minimum
risk of data loss on power failure. Because a battery module is installed,
power is supplied to the data cached in memory and the data can be
written to disk when power is restored.
Using write-back cache, the controller receives the data to write
to disk, stores it in the memory buffer, and immediately sends the
host OS a signal that the write operation is complete, before the
data is actually written to the disk drive. Write-back caching improves
the performance of write operations and the throughput of the controller
card. Write-back cache is enabled by default.
NOTE: The setting you specify you specify in the Write Back
field on the Cache tab of the Change Controller Parameters window
is the default global cache setting for all logical drives. (See Changing
Controller Parameters - Cache tab.)
Click OK.
NOTE: If you want to create another logical drive on the same
controller, click New Logical Drive. The logical drive you
just defined is created and you are returned to the top of the window,
enabling you to create another logical drive. You can create up to
32 logical drives and up to 32 partitions per logical drive.
To add this logical drive to a logical volume, click New LD
and see Adding a Logical Drive to a Logical
Volume.
When you are satisfied with the selections on this window, and do
not want to define another logical drive, click Commit. A confirmation
window is displayed showing the new configuration.
Click OK to accept the configuration.
Select Cancel to return to the console.
NOTE: You cannot change a logical drive configuration after
you click OK.
NOTE: During initialization LD/LV size is displayed as 0 Mbyte.
(HP-UX OS only). To ensure the environment is stable and accurate
after making configuration changes, you need to run the ioscan -fnC
disk command.
NOTE: If you used System Administrator Manager (sam) to unmount
the file system, make sure it is closed before running the ioscan
command.
(IBM AIX OS only). To ensure the environment is stable and accurate
after making configuration changes, you need to update the Object Data
Manager (ODM) as explained in Updating the
Object Data Manager on an IBM AIX host.
[ Contents ] [ Index
]