HP StorageWorks XP24000 Disk/Cache Partition User's Guide, v01 (T5214-96004, June 2007)

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Disk/C ache Par tition

The HP storage system can connect to multiple hosts and be shared by multiple users, such as different

departments or even different compa nies. This can cause conﬂicts among the various users. For

example, if a particular host issues a large numb er of I/O requests, the I/O performance of other hosts

may decrease. If the various ad m inistrators have different storage policies and p rocedures, or issue

conﬂicting commands, that can cause difﬁculties. Disk/Cache Par tition has two main functions: storage

management logical partition (SLPR) , and cache logical partition (CLPR).

Storage Ma nagement Logical Partition allows you to divide the available storage among various users. A

storage system can be shared among several groups that may have different storage administrators. This

can

cause problems if those administrators have differing or conﬂicting storage procedures, or if t wo or

more administrators at tempt to perform operations on the same logical volume, such as HP StorageWorks

LUN Expansion (LUSE) or HP StorageWorks XP Virtual LVI/LUN (VLL) . The storage management logical

partition function can allocate the storage system resources into two or more virtual storage systems, each

of which can be accessed only by the storage administrator, the storage partition administrator for that

storage management logical par tition, and the users for that partition.

Cache Logical Partition allows you to div ide the cache into multiple virtual cache memories. If one

storage system is shared with multiple hosts, and one host reads or writes a large amount of data,

read and write da ta can require enough of the cache memory to a ffect other users. The cache logical

partition function creates two or mo re virtual cache mem ories, with each alloc ated to a different host. This

prevents c ontention for cache memory.

XP24000 Disk/Cache Partition User's Guide