HP P2000 HP P2000 G3 MSA System CLI Reference Guide - Page 296

cache-parameter Properties Table 12 cache-parameter properties Name serial-number volume-name write-policy write-policynumeric cacheoptimization cacheoptimizationnumeric read-ahead-size read-aheadsize-numeric Type string string string string string string string string Description If a volume is specified, its serial number. If a volume is specified, its name. If a volume is specified, its cache write policy. • write-back: Write-back caching does not wait for data to be completely written to disk before signaling the host that the write is complete. This is the preferred setting for a fault-tolerant environment because it improves the performance of write operations and throughput. This is the default. • write-through: Write-through caching significantly impacts performance by waiting for data to be completely written to disk before signaling the host that the write is complete. Use this setting only when operating in an environment with low or no fault tolerance. Numeric equivalents for write-policy values. • 0: write-through • 1: write-back If a volume is specified, its cache optimization mode. • standard: Optimizes cache for both sequential and random reads. Used for applications that read and write small files in random order, such as transaction-based and database update applications. This is the default. • super-sequential: Optimizes cache for sequential reads only. Used for applications that read and write large files in sequential order, such as video playback and multimedia post-production video and audio editing applications. Numeric equivalents for cache-optimization values. • 0: standard • 1: super-sequential If a volume is specified, its read-ahead cache setting. • Disabled: Read-ahead caching is disabled. • Default: One chunk for the first access in a sequential read and one stripe for all subsequent accesses. • Maximum: Maximum read-ahead size calculated by the controller. • 64 KB, 128 KB, 256 KB, 512 KB, 1 MB, 2 MB, 4 MB, 8 MB, 16 MB, 32 MB: Size selected by a user. Numeric equivalents for read-ahead-size values. • -1: Default • 0: Disabled • 65536: 64 KB • 131072: 128 KB • 262144: 256 KB • 524288: 512 KB • 1048576: 1 MB • 2097152: 2 MB • 4194304: 4 MB • 8388608: 8 MB • 16777216: 16 MB • 33554432: 32 MB • -2147483648: Maximum 296 XML API basetype properties