HP XP P9500 Storage - Manual (Page 60)

LUSE configuration example
The following figure shows an example of a LUSE configuration. The host sees the LUSE volume
as one LDEV. The LUSE volume ID is the smallest LDEV ID.
LUSE configuration rules, restrictions, and guidelines
Rules
•
Open volumes (OPEN-3, OPEN-8, OPEN-9, OPEN-E, OPEN-L, and OPEN-V) are supported.
•
The number of LDEVs combined into a LUSE volume must be within the range 2 to 36. The
number of expanded LUs (LDEVs) should not exceed 36, even if the LUSE volume contains
another LUSE volume.
•
The emulation type of the LDEVs combined into a LUSE volume must be the same.
•
LDEVs that are to be combined into LUSE volumes must not be reserved for Auto LUN. For
more information on Auto LUN, contact the HP Technical Support.
•
The maximum capacity of a LUSE volume is 60 TB. Any LUSE volume contains up to 4 MB of
disk area to be used for controlling the volume, and this disk area cannot contain user data.
Therefore, the maximum capacity for user data in a LUSE volume is smaller than 60 TB.
•
The access attribute must be set to Read/Write.
•
The cache mode settings of the LDEVs combined into a LUSE volume must be the same.
•
The drive type of all LDEVs combined into a LUSE volume must be the same.
•
When releasing an LDEV from a LUSE volume:
The LUSE volume must not have any defined path.
◦
◦ The access attribute must be set to read/write.
Restrictions
•
LDEVs or LUSE volumes that are to be combined must have no assigned path definitions. For
this reason, the volumes used by Continuous Access Synchronous, Business Copy, Snapshot,
60 Configuring expanded LU provisioning