Hp Surestore Disk Array 12h and FC60 Manual de usuario descargar pdf (Pagina 300)

100

101

300 Managing the Disk Array Using Array Manager 60

see Table 31 on page 250 for details on what performance impact altering these settings

may have.

Setting Cache Page Size

Data caching improves disk array performance by storing data temporarily in cache

memory. The cache page size can be set to either 4

bytes or 16

bytes. The default page

size is 4 Kbytes. The page size is set for both controllers in the disk array.

To set cache page size, type:

ammgr -p {4|16} <ArrayID>

Command Example

The following example sets the cache page size to 16

bytes on disk array rack_1:

ammgr -p 16 rack_1

Setting the Cache Flush Threshold

The cache flush threshold sets the level at which the disk array begins flushing (writing)

cache content to the disks. Cache will be flushed until the cache flush limit value is

reached. The default value for this setting is 80%. The cache flush threshold can be set

independently for each controller.

To set cache flush threshold, type:

ammgr -T <cntrlrID>:<percent> <ArrayID>

•

percent

indicates the percentage of cache memory that must be full before flushing

begins. For example, if set to 80%, cache flushing will begin when 80% of cache memory

is full.

Command Example

The following example sets the cache flush threshold to 80% for controller A on disk array

0000005EBD20:

ammgr -T A:80 0000005EBD20

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