When I run hard drive diagnostics I get:
Drive 0 -- pass
Drive 2 -- Fail. Return code 7 (Dell support say this means Drive 2 is failing).
My question: Assuming Drive 0 is okay, can I switch the machine to boot from that drive using Intel Matrix Storage Manager or settings in the BIOS. And is there a safe way to do this with no data loss?
The steps for recovering can vary greatly by vendor. Get a replacement drive and follow the vendor's instructions for restriping. Some will allow you to just replace the failing drive. Others I have seen have very specific steps to remirror and can lose data if done incorrectly.
Thanks for your answers. I ran chkdsk on both drives on another PC via a USB enclosure. Upon replacing the drives, I was able to successfully boot and apply the driver update.
I've already bought a replacement drive but I was wondering on whether or not to hold off on replacing the "failing" drive until RAID says it's actually degraded. Although the drive fails the hardware diagnostics, the Intel Storage Manager still indicates that the RAIL1 volume status is OK. Is it possible the hardware diagnostics give false positives?
Also, I can't figure out an easy way of identifying the physical disk that corresponds to "Drive 2 -- Fail. Return code 7". I suppose I could unplug one disk and rerun hardware diagnostics, but I'm guessing that that would "break" the RAID array.