HP MSA 2040 CLI Reference Guide

show cache-parameters 207
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 for which to show settings. For volume syntax, see
"Command syntax" (page 20). If this parameter is not specified, only system-wide settings are
shown.
Output
System cache parameters:
Operation Mode
Shows the system’s operating mode, also called the cache redundancy mode:
• Active-Active ULP: Both controllers are active using ULP (Unified LUN Presentation). Data
for volumes configured to use write-back cache is automatically mirrored between the two
controllers to provide fault tolerance.
• Single Controller: There is only a single controller in the enclosure.
• Failed Over: Operation has failed over to one controller because its partner is not
operational. The system has lost redundancy.
• Down: Both controllers are not operational.
Controller cache parameters:
Write Back Status
Shows the current, system-wide cache policy as determined by auto-write-through logic. This value is
not settable by users. If an auto-write-through 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
• Not Installed: The CompactFlash card is not installed.
• Installed: The CompactFlash card is installed.
CompactFlash Health
• OK
• Fault
• Unknown
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.