My RAID 1 mirror worked fine until a couple days ago, when it was triggered to start a rebuild. It seems to now be continuously rebuilding, in that I saw it go to 95% done, and when I looked a few hours later, it was back to 5% done. I assume one of the two underlying hard disks is flaky and should be replaced -- but which one?? The ROM BIOS control-I merely says the volume is rebuilding, and Intel Rapid Storage Technology likewise says the volume is rebuilding, and the detailed report of the two underlying drives is "normal". In sum, I see no clue from either ROM BIOS or IRST which hard drive to replace.
This is slightly dated equipment and software. The mobo is DX58SO, and the BIOS isn't the latest -- I had to stop updating because Intel's updates were breaking more things than they fixed! IRST is also not the latest: 9.6.0.1014. I figure it's risky to try to update it at this point.
What's my simplest pathway? I could disconnect one of the two drives and boot it and see if the system functions properly; if it does, then I can assume I've found the bad drive and replace it and let it rebuild again. Or if the system doesn't function with the one drive disconnected, I can disconnect the other drive instead, and see if that works any better. But is there something I can do that doesn't involve guesswork? Something that will report, for example, which underlying disk is being written? I don't want to make a mess here; I just want to make a surgical change.