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Troubleshooting Your Enclosure 79
PCI Errors
The storage enclosure 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 will generate a critical event if the RAID controller module
detects a critical condition that could cause immediate failure of the
enclosure 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 in the critical range
• Backplane/power supply failure
• 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 enclosure cannot
issue critical or noncritical event alarms for any enclosure component.
When the enclosure is under critical condition, its enclosure status LED
blinks amber.
Noncritical Conditions
A noncritical condition is an event or status that will 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 enclosure is under noncritical condition, its enclosure status LED
blinks amber.