HP XP P9500 Storage - Manual (Page 65)

LUSE configuration rules, restrictions, and guidelines
Rules
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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 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, Fast Snap,
Snapshot, and, Continuous Access Journal, and External Storage Access Manager cannot be
targets of LUSE operations (see
“LUSE operations using a path-defined LDEV” (page 66) ).
•
When combining a LUSE volume with another LUSE volume, the range of LDEVs should not
be overlapped. For example, if you combine LDEV00, LDEV03 and LDEV05 into LUSE 1,
LDEV02 and LDEV04 into LUSE 2, and LDEV06 and LDEV07 into LUSE3, you can also combine
LUSE 1 and LUSE3. However, you cannot combine LUSE 1 and LUSE 2, because the LDEV
range in LUSE 1 and LUSE 2 is overlapped.
LUSE configuration rules, restrictions, and guidelines 65