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    Fixing Software RAID on XenServer

    Scheduled Pinned Locked Moved IT Discussion
    xenserverlinuxraidmdadm
    13 Posts 6 Posters 2.5k Views
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    • KellyK
      Kelly @Dashrender
      last edited by

      @Dashrender Yes

      1 Reply Last reply Reply Quote 0
      • DustinB3403D
        DustinB3403
        last edited by

        This is why you replicate your Boot devices to a backup.

        Something I plan on doing this weekend (to avoid this very same issue)

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        • DustinB3403D
          DustinB3403
          last edited by

          As for trying to recover, can you not mount the array in XenServer without it wiping the array?

          KellyK 1 Reply Last reply Reply Quote 0
          • KellyK
            Kelly @DustinB3403
            last edited by

            @DustinB3403 said:

            As for trying to recover, can you not mount the array in XenServer without it wiping the array?

            I can't access the array in dom0 right now.

            I tried doing mdadm --assemble /dev/md0 /dev/sd[bcef]. It says that md0 already exists. When I run cat /proc/mdstat it shows md0 as inactive with only sdb as a member.

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            • coliverC
              coliver
              last edited by

              This link has lots of good info on MD RAID recovery.

              https://raid.wiki.kernel.org/index.php/RAID_Recovery

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              • KellyK
                Kelly
                last edited by

                So the RAID is rebuilding. I ended up having to run this to get the drives reconnected to each other and dom0:

                mdadm --create /dev/md0 /dev/sd[bcef]
                

                It is still resyncing, so I'm not sure if it worked or not, but md0 appears to be happy.

                travisdh1T 1 Reply Last reply Reply Quote 1
                • travisdh1T
                  travisdh1 @Kelly
                  last edited by

                  @Kelly said:

                  So the RAID is rebuilding. I ended up having to run this to get the drives reconnected to each other and dom0:

                  mdadm --create /dev/md0 /dev/sd[bcef]
                  

                  It is still resyncing, so I'm not sure if it worked or not, but md0 appears to be happy.

                  It should be fine. Just assuming that none of the drives got mounted and written too, and even if 1 did, the RAID should recover from a single corrupt drive.

                  1 Reply Last reply Reply Quote 1
                  • scottalanmillerS
                    scottalanmiller @Dashrender
                    last edited by

                    @Dashrender said:

                    You're running a MDADM RAID 10, yes?

                    MD RAID. MDADM is the administration utility for MD RAID. There is no such thing as MDADM RAID.

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                    • scottalanmillerS
                      scottalanmiller
                      last edited by

                      Did it rebuild successfully?

                      KellyK 1 Reply Last reply Reply Quote 0
                      • KellyK
                        Kelly @scottalanmiller
                        last edited by

                        @scottalanmiller said:

                        Did it rebuild successfully?

                        I don't know. I ended up setting up the necessary VMs on other hosts and started rebuilding this one since it has been having stability issues in the last few weeks.

                        scottalanmillerS 1 Reply Last reply Reply Quote 0
                        • scottalanmillerS
                          scottalanmiller @Kelly
                          last edited by

                          @Kelly said:

                          @scottalanmiller said:

                          Did it rebuild successfully?

                          I don't know. I ended up setting up the necessary VMs on other hosts and started rebuilding this one since it has been having stability issues in the last few weeks.

                          Ah okay, probably best but it is nice when you can figure out what happened, just to know what it was 😞

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