Troubleshooting Your Enclosure 79PCI ErrorsThe storage enclosure firmware can detect and only recover from PCI errorswhen the RAID controller modules are configured for redundancy. If a virtualdisk uses cache mirroring, it fails over to its peer RAID controller module,which initiates a flush of the dirty cache.Critical ConditionsThe storage array will generate a critical event if the RAID controller moduledetects a critical condition that could cause immediate failure of theenclosure and/or loss of data. The storage array is in a critical condition if oneof 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 portNOTE: If both RAID controller modules fail simultaneously, the enclosure cannotissue critical or noncritical event alarms for any enclosure component.When the enclosure is under critical condition, its enclosure status LEDblinks amber.Noncritical ConditionsA noncritical condition is an event or status that will 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 has been removed• A physical disk in a redundant virtual disk has failedWhen the enclosure is under noncritical condition, its enclosure status LEDblinks amber.
