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272 Troubleshooting: Your Array
PCI Errors
The storage array firmware can detect and only recover from PCI errors when
the RAID controller modules are configured for redundancy. If a virtual disk
uses cache mirroring, it fails over to its peer RAID controller module, which
initiates a flush of the dirty cache.
Critical Conditions
The storage array generates a critical event if the RAID controller module
detects a critical condition that could cause immediate failure of the array
and/or loss of data. The storage array is in a critical condition if one of the
following occurs:
• More than one fan has failed
• Any backplane temperature sensors is in the critical range
• Backplane/power supply has failed
• Two or more temperature sensors are unreadable
• Failure to detect or unable to communicate with peer port
NOTE: If both RAID controller modules fail simultaneously, the array cannot issue
critical or noncritical event alarms for any array component.
When the array is under critical condition, its array status LED blinks amber.
Noncritical Conditions
A noncritical condition is an event or status that does not cause immediate
failure, but must be corrected to ensure continued reliability of the storage
array. Examples of noncritical events include the following:
• One power supply has failed
• One cooling fan has failed
• One RAID controller module in a redundant configuration has failed
• A battery has failed or has been removed
• A physical disk in a redundant virtual disk has failed
When the array is under noncritical condition, its array status LED blinks
amber.
book.book Page 272 Thursday, December 9, 2010 3:20 PM