HP P2000 G3 Cli Reference Guide

HP P2000 G3 MSA System CLI Reference Guide 355
cache-parameter
Properties
Table 12 cache-parameter properties
Name Type Description
serial-number string If a volume is specified, its serial number.
volume-name string If a volume is specified, its name.
write-policy string 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
default and preferred setting for a fault-tolerant environment because it
improves the performance of write operations and throughput.
• 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.
write-policy-
numeric
string Numeric equivalents for write-policy values.
• 0: write-through
• 1: write-back
cache-
optimization
string If a volume is specified, its cache optimization mode.
• standard: Optimizes cache for both sequential and random reads.
Appropriate for applications that read and write small files in random
order, such as transaction-based and database update applications. This is
the default.
cache-
optimization-
numeric
string Numeric equivalents for cache-optimization values.
• 0: standard
read-ahead-size string 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, or
32 MB: Size selected by a user.
read-ahead-
size-numeric
string 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

HP P2000 G3 Specifications

General

Model	P2000 G3
Category	Storage
Drive Support	SAS, SATA
Host Interface	iSCSI, Fibre Channel, SAS
Form Factor	2U
RAID Levels	0, 1, 5, 6, 10
Cache	2 GB
Drive Bays	12 (SFF), 24 (SFF), 12 (LFF)
Cache Memory	2GB per controller
Operating Temperature	10°C to 35°C
Power Supply	Redundant
Expansion Options	Disk Enclosures