Show Cache-Parameters - HP P2000 Reference Manual

show cache-parameters

Description Shows cache settings and status for the system and optionally for a volume.
Syntax
show cache-parameters [volume]
Parameters volume
Optional. Name or serial number of the volume to show settings for. For volume syntax, see
Command syntax
Output System/controller cache parameters:
Operation Mode
The operation mode, also called the redundancy mode.
• Active-Active ULP: Both controllers are active using ULP (Unified LUN Presentation).
• Single Controller: There is only a single controller in the enclosure.
Write Back Status
Shows the current, system-wide cache policy as determined by auto-write-through (AWT) logic. This
value is not settable by users. If an AWT trigger condition (such as a CompactFlash failure) is met,
the cache policy for all volumes changes to write-through, overriding the volume-specific settings.
When the problem is corrected, the cache policy reverts to the value configured for each individual
volume.
• Enabled: Write-back. This is the normal state.
• Disabled: Write-through.
• Not up: The controller is not up.
CompactFlash Status
Shows whether the controller's CompactFlash card is installed
Cache Flush
• Enabled: If the controller loses power, it will automatically write cache data to the
CompactFlash card. Cache flush is normally enabled, but is temporarily disabled during
controller shut down.
• Disabled: Cache flush is disabled.
Volume cache parameters:
Serial Number
If a volume is specified, its serial number
Name
If a volume is specified, its name
Cache Write Policy
If a volume is specified, its cache write policy: write-back or write-through
Cache Optimization
If a volume is specified, its cache optimization mode: standard (random) or super-sequential
Read Ahead Size
If a volume is specified, its read-ahead cache setting
174 Alphabetical list of commands
on page 21. If this parameter is not specified, only system-wide settings are shown.