Dell PowerVault MD3220i Owner's Manual - Page 258

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 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 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. 258 Troubleshooting: Your Array