HP XP Array Manager Software - Manual (Page 90)

Description Subfield Field
Select one or more host mode options for supporting special requirements
for specific applications. Host mode op-
tions
Logical unit (LU) numbers can be assigned automatically or manually for
the volumes being allocated.
To automatically assign LU numbers to the allocated volumes, select auto
and enter a start from number (or use the default). LU numbers are set in
ascending order while avoiding existing numbers.
To manually assign LU numbers to the allocated volumes, select manual
and click Select LU Number to choose a starting LU number.
auto or manual
selection buttons
LU Number
An option for manually specifying the starting virtual LDEV ID to use for
allocated volumes. Volumes for which virtual IDs have not been specified
are assigned a new virtual LDEV ID when they are allocated to a host that
belongs to resource groups used in data migrations that use virtual IDs.
Virtual LDEV IDs are assigned automatically by default, with unused IDs
assigned to volumes in ascending order. If a user manually specifies an
ID, volumes receive the lowest available ID that is equal to or greater than
the specified value.
(See the follow-
ing field for de-
tails)
>> Virtual ID
Settings
Logical disk controller (LDKC) number that forms part of the starting virtual
LDEV ID.
LDKC
Starting virtu-
al LDEV ID
Targets
Control unit (CU) number that forms part of the starting virtual LDEV ID. CU
Device (DEV) number that forms part of the starting virtual LDEV ID. DEV
Related topics
• About allocating volumes , page 78
• Volume allocation methods , page 79
• Allocating volumes from general tasks , page 81
• Allocating volumes to selected hosts , page 81
• Allocating selected volumes to hosts , page 82
• Allocating volumes to clustered hosts , page 82
• Allocating volumes by using a keyword search , page 83
• Allocating volumes by using a criteria search , page 84
• Allocating volumes by using existing volume settings , page 85
About clustered-host storage
Clustered-host storage is a storage configuration that is created when volumes are allocated to a new
host that has been added to an existing host group (also known as a host cluster).
In creating clustered-host storage, when adding the WWN of the new host to the same host group
to which the WWN of the existing host belongs, you can also set LUN paths from the new host to the
same volumes as those for the existing host.
For example, to better manage clustered-host storage, you could use this method to update the existing
host group whenever new or additional volumes are allocated to a new host in the host group.
The newly allocated volumes represent additional storage resources for a new host, by which existing
volumes that are already allocated to a host in the host group can be allocated to a new host.
Managing storage resources in a SAN environment 90