272 Troubleshooting: Your ArrayPCI ErrorsThe storage array firmware can detect and only recover from PCI errors whenthe RAID controller modules are configured for redundancy. If a virtual diskuses cache mirroring, it fails over to its peer RAID controller module, whichinitiates a flush of the dirty cache.Critical ConditionsThe storage array generates a critical event if the RAID controller moduledetects a critical condition that could cause immediate failure of the arrayand/or loss of data. The storage array is in a critical condition if one of thefollowing 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 portNOTE: If both RAID controller modules fail simultaneously, the array cannot issuecritical or noncritical event alarms for any array component.When the array is under critical condition, its array status LED blinks amber.Noncritical ConditionsA noncritical condition is an event or status that does not cause immediatefailure, but must be corrected to ensure continued reliability of the storagearray. 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 is removed• A physical disk in a redundant virtual disk has failedWhen the array is under noncritical condition, its array status LED blinksamber.
