Ubuntu
mdadm package

Move array to new hardware

Asked by Cindi Deschane

I have moved the RAID drives from my old machine to a new one. The drives were connected to a hardware RAID controller in the old machine but they are connected as plain Jane SATA drives in the new machine. Everybody seems to be happy and mdadm reports the array as healthy and alive and I am able to mount the array and use it. The RAID device on the old machine was md127 and mdadm reports it as the same device on the new machine.

So, should I count my lucky stars and use the array as is, or is there a gotcha that I am missing?

mdadm --detail /dev/md127
/dev/md127:
        Version : 1.2
  Creation Time : Tue May 31 07:10:10 2011
     Raid Level : raid1
     Array Size : 976759672 (931.51 GiB 1000.20 GB)
  Used Dev Size : 976759672 (931.51 GiB 1000.20 GB)
   Raid Devices : 2
  Total Devices : 2
    Persistence : Superblock is persistent

    Update Time : Tue Aug 7 13:14:56 2012
          State : clean
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

           Name : mitch:0
           UUID : 2c76d9fc:25c8eae6:282679c9:9dbf7a06
         Events : 259

    Number Major Minor RaidDevice State
       0 8 17 0 active sync /dev/sdb1
       1 8 49 1 active sync /dev/sdd1

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Thomas Krüger (thkrueger) said : 		#1

It loks fine. If you are wondering about the high number un md127. This is a new feature: arrays names in mdadm.conf will now get higher numbers. They should be accessed via the name symlink, especially when there is more than one array.

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