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

Figure 1
An Examp l e of Storage Managemen t Logi cal Partition Func tion
To creat
e
SLPR, allocate the resources of storage system, that is, por ts and CLPRs. For instructions on
alloca
ting the
resources of storage system, see “Performing Disk/Cache Partition Operations” on page 33.
To crea
te a CLPR and manage it, you need a user authority for storage sys-
tem, that is, Storage Administrator. For details on a Storage Administrator, see
“Storage Administrator and Storage Partition Administrator Privileges” on page 17 in this manual and the
HP Sto
rageWorks XP24000 Remote Web Console User’s Guide.
• SLPR and LDKC
You c an allocate storage system resources that belong to the op tional LDKC to an SLPR.
Cache Logical Partition (CLPR)
If one storage system is shared with multiple hosts, and one host in these hosts reads o r writes a large
amount of data, the read and write data of the host may occupies the large area in the cache memory
of the
storage system. Under this circumstances, other hosts slow down the read/write speed since
other hosts must wait for a chance to write into the c ache m emory. The cache logical par tition function
of
Disk/Cache Partition can partition the ca che m emory of the storage system. The partitioned cache
memories are used as the virtual cache memories, and each of them is a llocated to each host. As a
result, the situation that the specified host exclusively uses most area of cache mem ory can be prevented.
Figure 2 on page 15 shows an example of use for the network within a corporation. The cache memory
is partitioned to three virtual cache memories. Each virtual cache m em ory is allo cated to each host of
three branch offices. The host of branch A is inputting and outputting a large amount of data to or from
storage system. However, the read and write data of the host of branch A does not occupy the cache
memor y because the capacity of cache that the host of branch A can use is limited to 40 Gbytes. Even
if thehostofbranchAaccessesalargeamountofdata, thehosts of otherbranchesdoesnot slow
14
About Disk/Cache Partition Operations