Q: What is the default behavior when a drive fails?
A: The default settings for a MegaRAID controller will enforce an automatic rebuild policy, and usually an automatic copyback as well. The automatic rebuild, in the presence of commissioned hot spares, will automatically set a failed drive offline, and designate the first compatible hot spare attached to the controller to take the place of the failed drive. At that point, you need only remove the failed drive, and replace it with a spare. The controller then copies the data from the previously consumed hot spare back to the new drive you inserted, and recommissions the hot spare to be used for the next failure.
For safety and security, LSI MegaRAID controllers maintain an exact layout that maps drive metadata by enclosure and slot number, so hot spares are always temporary. Moreover, drives are not allowed to move to different slots, nor are they allowed to drop offline without warning.
Any drives that are removed from the enclosure for any reason are marked as missing, and cannot be imported back into the array without manual user intervention. This behavior is designed to prevent faulty drives from randomly disconnecting and reconnecting, which may corrupt the data on the rest of the array.
Fan alerts in MegaRAID Storage Manager
Q: My RAID controller is reporting fan failures, but the system appears to be functioning just fine. Why is this happening? A: The RAID controller is reading those statuses from the backplane. This is normal behavior if you have recently installed a ...
Controller beep codes
Q: My RAID controller is emitting a loud beep. What does this mean? A: See the following table for a list of LSI MegaRAID beep codes. Event Virtual Drive State Beep Code RAID 0 loses a drive Offline 3 seconds on and 1 second off RAID 1 loses a mirror ...
Disabling automatic rebuild
Q: Can I disable the automatic rebuild behavior? A: Yes, you can disable automatic rebuild and copyback operations. This is useful for when you want to schedule rebuild behavior, as a rebuild will consume significant controller resources and possibly ...
Silencing RAID controller alarms
Q: I would like to disable the beep on the controller. How do I accomplish this? A: LSI MegaRAID controllers have three different options for managing the fault alarm; Enable, Disable, and Silence. Disabling the alarm will disable it permanently ...
Management Utilities Overview (LSI)
If you are new to LSI MegaRAID and LSI SAS HBA controllers, this guide will provide a general overview of applicable management utilities and firmware flash utilities, and recommended usage scenarios for these tools. LSI MegaRAID Management ...