3 Replies Latest reply on Feb 13, 2018 11:52 AM by cube1us2

    System Drive Recovery

    GBaylis

      If I create a Raid 1 array for my system (boot) drive and the primary drive fails, will the system automatically boot from the secondary disk or would I simply have to point the BIOS to the secondary drive to boot from it?

       

      Thanks, Geoff

        • 1. Re: System Drive Recovery
          cube1us2

          Based on my experience with an albeit older Intel RAID chipset, I would expect that if a drive fails the array will then be in a "degraded" state, but should still operate.  It should, in essence, still boot from the array - it isn't booting from the raw drive alone (and if I recall correctly, it cannot do so).  You would not need to (and probably must not) make any BIOS setting changes, e.g. changing it from RAID to something else.

          • 2. Re: System Drive Recovery
            GBaylis

            Thanks. I guess the key point is whether the BIOS sees (a) a single drive (which is the RAID), so the alternate will be used automatically if the boot fails, or (b) just a physical drive as normal, then the RAID is in operation once Windows kicks in.

            • 3. Re: System Drive Recovery
              cube1us2

              Neither is exactly correct, but (a) is closer.  The BIOS still sees the remaining drive as a RAID *member* operating in  "degraded" mode  (i.e., its RAID-1 partner mirror is missing in action).

               

              Assuming that the Motherboard BIOS settings are unchanged (in particular that the BIOS disk controller remains in RAID mode), and one does not mess around with the remaining drive, the motherboard will still see it as a RAID member, as will the OS.  You actually have to write over the RAID meta-data to turn it back into an "ordinary" drive.

               

              Note that there are actually two pieces of BIOS involved:  the Motherboard BIOS and the RAID support BIOS.