HP StorageWorks XP Remote Web Console Software - Manual (Page 31)

allocate the free volumes equally to the base volumes. For example, if six free volumes and two
base volumes are selected, three free volumes (aliases) are allocated to each base volume.
WARNING!
•
If you want to assign aliases to multiple CUs that are used by a host, you need to click Apply
as you add each alias to the CU. If you add all of the aliases to a CU, and then click Apply,
the host performance will be reduced.
•
When dynamic Compatible PAV is used, you must use a host command to check the number
of aliases assigned to the desired base volume (for details on the host command, see
“Verifying
Base and Alias Device Definition” (page 35) ). If this number has been reached 255, the
following procedure cannot give accurate results because you cannot assign more than 255
aliases for each base volume.
•
If you use only Compatible Hyper PAV to issue I/O requests to a CU or LCU image, you can
just decide the number of aliases that are necessary for the LCU, and assign the aliases to
arbitrary base volumes. The assigned aliases will work as aliases for all base volumes in the
concerned LCU. In that case, assign three or less alias devices for one base device.
To assign aliases to volumes in the connected storage system:
1. Select the LDKC which includes the CU imagenumber to be set, in the LDKC list to select LDKCs
located in the upper left part of the Compatible PAV window.
2. In the Compatible PAV window, select the CU image which contains the desired base volumes.
The total number of available free volumes is displayed under the Free Volume list box.
3. Select the desired base volumes in the Base Volume List box, select the desired free volumes
in the Free Volume List box, and then click Add to add the new aliases to the Alias Volume
List box.
To assign one alias to each base volume, select the same number of free volumes as base
volumes. To assign three aliases to each base volume, select three times as many free volumes
as base volumes (for example, 3 base volumes and 9 free volumes).
4. Click Apply in the Compatible PAV window. When the set Compatible PAV confirmation
dialog box appears, click OK to assign the new aliases as specified. To cancel your request,
click Cancel.
To set the CU image numbers included in another LDKC, switch the LDKC by step 1 and then follow
step 2 to step 4 .
Assigning, Canceling, and Migrating Aliases 31