HP StorageWorks XP Remote Web Console Software - Manual (Page 11)

1 Overview of HP StorageWorks
XP Disk/Cache Partition
The HP storage system can connect to multiple hosts and be shared by multiple users, such as different
departments or even different companies. This can cause conflicts among the various users. For
example, if a particular host issues a large number of I/O requests, the I/O performance of other hosts
may decrease. If the various administrators have different storage policies and procedures, or issue
conflicting commands, that can cause difficulties. Disk/Cache Partition has two main functions: storage
management logical partition (SLPR), and cache logical partition (CLPR).
Storage Management 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 two or
more administrators attempt to perform operations on the same logical volume, such as HP StorageWorks
XP 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 partition, and the users for that partition.
Cache Logical Partition allows you to divide 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 data can require enough of the cache memory to affect other users. The cache logical
partition function creates two or more virtual cache memories, with each allocated to a different host. This
prevents contention for cache memory.
XP24000 Disk/Cache Partition User's Guide 11