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    Building Out XenServer 6.5 with USB Boot and Software RAID 10

    Scheduled Pinned Locked Moved IT Discussion
    xenvirtualizationxenserverxenserver 6.5how to
    182 Posts 13 Posters 63.3k Views
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    • RomoR
      Romo
      last edited by

      Your could run

      mdadm --examine --scan >> /etc/mdadm/mdadm.conf

      To recreate the conf and see if it fixes the problem. /dev/md/0 should be a symbolic link to /dev/md0

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

        @Romo Same response when reexamining the disks. this is for both

        mount /mnt/raid10 && mount /dev/md10
        

        0_1447093679739_2015-11-09_13-27-40.png

        1 Reply Last reply Reply Quote 0
        • dafyreD
          dafyre
          last edited by

          mount /dev/md0 /mnt/raid10 ?

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

            /dev/md0 not md10

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

              Using RAID 10 in names anywhere is very confusing and hard to read. I think several of these issues are partially stemming just from poor naming conventions. Name mount points by purpose, not technology.

              1 Reply Last reply Reply Quote 1
              • RomoR
                Romo
                last edited by

                You can't mount /dev/md0, because according to the mdadm --examine --scan ouput, the array, is at /dev/md/0

                StrongBadS 1 Reply Last reply Reply Quote 0
                • StrongBadS
                  StrongBad @Romo
                  last edited by

                  @Romo said:

                  You can't mount /dev/md0, because according to the mdadm --examine --scan ouput, the array, is at /dev/md/0

                  Good eye, that was hard to see.

                  1 Reply Last reply Reply Quote 0
                  • RomoR
                    Romo
                    last edited by

                    What is the ouput for:
                    cat /dev/md/md-device-map

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

                      cat /dev/md/md-device-map
                      cat: /dev/md/md-device-map: No such file or directory
                      
                      RomoR 1 Reply Last reply Reply Quote 0
                      • RomoR
                        Romo @DustinB3403
                        last edited by

                        @DustinB3403
                        ls /dev/ | grep md

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

                          0_1447096524174_2015-11-09_14-15-08.png

                          1 Reply Last reply Reply Quote 0
                          • RomoR
                            Romo
                            last edited by

                            @DustinB3403 can you please show us the output of your mdadm.conf file, last time I believe it was cut off because the UUID's dont show.

                            DustinB3403D 1 Reply Last reply Reply Quote 1
                            • DustinB3403D
                              DustinB3403 @Romo
                              last edited by

                              @Romo 0_1447098513375_2015-11-09_14-48-15.png

                              There is now a new record (3rd line)

                              1 Reply Last reply Reply Quote 0
                              • Reid CooperR
                                Reid Cooper
                                last edited by

                                That can't be right. I'm sure only one of those lines is supposed to be there.

                                1 Reply Last reply Reply Quote 0
                                • RomoR
                                  Romo
                                  last edited by

                                  Quite strange that the first two entries don't have a UUID set, mdadm needs the UUID set.

                                  We could try to manually edit the file, adding the UUID from the last entry into the first entry, and then removing entries 2 and 3.

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

                                    @Romo Like so?

                                    [root@eaglexen-baby mnt]# cat /etc/mdadm.conf 
                                    ARRAY /dev/md0 level=raid10 num-devices=4 metadata=1.2 name=eaglexen-baby:0 UUID=5bd9375b:2166352e:622be934:4b65a7ea
                                       devices=/dev/sdb,/dev/sdc,/dev/sdd,/dev/sde metadata=1.2  name=eaglexen-baby:0
                                    [root@eaglexen-baby mnt]#
                                    
                                    1 Reply Last reply Reply Quote 0
                                    • RomoR
                                      Romo
                                      last edited by

                                      @DustinB3403 said:

                                      ARRAY /dev/md0 level=raid10 num-devices=4 metadata=1.2 name=eaglexen-baby:0 UUID=5bd9375b:2166352e:622be934:4b65a7ea
                                      devices=/dev/sdb,/dev/sdc,/dev/sdd,/dev/sde metadata=1.2 name=eaglexen-baby:0

                                      ARRAY /dev/md0 level=raid10 num-devices=4 metadata=1.2 name=eaglexen-baby:0 UUID=5bd9375b:2166352e:622be934:4b65a7ea
                                      devices=/dev/sdb,/dev/sdc,/dev/sdd,/dev/sde

                                      1 Reply Last reply Reply Quote 1
                                      • RomoR
                                        Romo
                                        last edited by

                                        Don't need the metadata and name again after the devices

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

                                          [root@eaglexen-baby mnt]# cat /etc/mdadm.conf 
                                          ARRAY /dev/md0 level=raid10 num-devices=4 metadata=1.2 name=eaglexen-baby:0 UUID=5bd9375b:2166352e:622be934:4b65a7ea devices=/dev/sdb,/dev/sdc,/dev/sdd,/dev/sde
                                          
                                          1 Reply Last reply Reply Quote 0
                                          • RomoR
                                            Romo
                                            last edited by

                                            Yes, seems ok. Reboot and try to check the status of the array once again

                                            DustinB3403D 1 Reply Last reply Reply Quote 0
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