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    Building Out XenServer 6.5 with USB Boot and Software RAID 10

    IT Discussion
    xen virtualization xenserver xenserver 6.5 how to
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    • 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.

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          • RomoR
            Romo
            last edited by

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

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            • 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)

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                      • 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.

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                        • 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]#
                            
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                            • 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
                                    • DustinB3403D
                                      DustinB3403 @Romo
                                      last edited by

                                      @Romo said:

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

                                      Rebooted.

                                      Array found, drives mounted.

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

                                        So now that we're back to working condition. We need an entry added to fstab to auto-mount the array.

                                          GNU nano 1.3.12             File: /etc/fstab                                  
                                        
                                        LABEL=root-mhdhrpdq    /         ext3     defaults   1  1
                                        /var/swap/swap.001          swap      swap   defaults   0  0
                                        none        /dev/pts  devpts defaults   0  0
                                        none        /dev/shm  tmpfs  defaults   0  0
                                        none        /proc     proc   defaults   0  0
                                        none        /sys      sysfs  defaults   0  0
                                        none        /sys/fs/cgroup cgroup memory 0 0
                                        /opt/xensource/packages/iso/XenCenter.iso   /var/xen/xc-install   iso9660   loo$
                                        /mnt/raid10   /dev/md0  ext3  defaults 0  0
                                        
                                        RomoR 1 Reply Last reply Reply Quote 0
                                        • RomoR
                                          Romo
                                          last edited by

                                          Does xencenter see the storage?

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

                                            Yes, the Local OBR10 is back on XenCenter.

                                            1 Reply Last reply Reply Quote 0
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