174 Alphabetical list of commands
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 on page 21. If this parameter is not specified, only system-wide settings are shown.
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
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