HP MSA 2040 SAN Storage - Manual (Page 57)

Controller failure in a single-controller configuration 57
Is the power supply Input Power Source LED off?
Is the power supply Voltage/Fan Fault/Service Required LED amber?
Controller failure in a single-controller configuration
Cache memory is flushed to CompactFlash in the case of a controller failure or power loss. During the write
to CompactFlash process, only the components needed to write the cache to the CompactFlash are
powered by the supercapacitor. This process typically takes 60 seconds per 1 Gbyte of cache. After the
cache is copied to CompactFlash, the remaining power left in the supercapacitor is used to refresh the
cache memory. While the cache is being maintained by the supercapacitor, the Cache Status LED flashes
at a rate of 1/10 second on and 9/10 second off.
IMPORTANT: Transportable cache only applies to single-controller configurations. In dual controller
configurations, there is no need to transport cache from a failed controller to a replacement controller
because the cache is duplicated between the peer controllers (subject to volume write optimization setting).
Answer Possible reasons Actions
No System functioning properly. No action required.
Yes The power supply is not receiving
adequate power.
• Verify that the power cord is properly connected and check
the power source to which it connects.
• Check that the power supply FRU is firmly locked into
position.
• In the SMU, check the event log for specific information
regarding the fault; follow any Recommended Actions.
• If the above action does not resolve the fault, isolate the
fault, and contact an authorized service provider for
assistance.
Table 12 Diagnostics LED status: Rear panel power supply “Input Power Source”
Answer Possible reasons Actions
No System functioning properly. No action required.
Yes The power supply unit or a fan is
operating at an unacceptable
voltage/RPM level, or has failed.
When isolating faults in the power supply, remember that the
fans in both modules receive power through a common bus on
the midplane, so if a power supply unit fails, the fans continue to
operate normally.
• Check that the power supply FRU is firmly locked into
position.
• Check that the power cable is connected to a power source.
• Check that the power cable is connected to the power
supply module.
Table 13 Diagnostics LED status: Rear panel power supply: “Voltage/Fan Fault/Service Required”