HP Surestore Disk Array FC60 HP SureStore E Disk Array FC60 - (English) Advanc - Page 300

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 Kbytes or 16 Kbytes. 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} Command Example The following example sets the cache page size to 16 Kbytes 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 : • 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 300 Managing the Disk Array Using Array Manager 60