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Repairing RAID of the swap (view source)

Revision as of 21:56, 10 February 2016

2,995 bytes added ,  21:56, 10 February 2016
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           18600960 blocks super 1.1 [2/2] [UU]
 
           18600960 blocks super 1.1 [2/2] [UU]
 
           bitmap: 0/1 pages [0KB], 65536KB chunk
 
           bitmap: 0/1 pages [0KB], 65536KB chunk
 +
   
 
     unused devices: <none>  
 
     unused devices: <none>  
   Line 34: Line 35:  
     # mdadm --manage /dev/md2 --add /dev/vdb2
 
     # mdadm --manage /dev/md2 --add /dev/vdb2
 
     mdadm: /dev/vdb2 not large enough to join array (the disk#2 has been added to the machine afterwards)
 
     mdadm: /dev/vdb2 not large enough to join array (the disk#2 has been added to the machine afterwards)
 +
 +
==== The RAID array: ====
 +
* stop the swap:
 +
    # swapoff -a
 +
   
 +
* get details about /dev/md2 and remember the UUID and the name of the RAID. In my case:
 +
    # mdadm --detail /dev/md2
 +
    /dev/md2:
 +
            Version : 1.1
 +
      Creation Time : Mon Feb  1 21:42:29 2016
 +
        Raid Level : raid1
 +
        Array Size : 2095104 (2046.34 MiB 2145.39 MB)
 +
      Used Dev Size : 2095104 (2046.34 MiB 2145.39 MB)
 +
      Raid Devices : 2
 +
      Total Devices : 1
 +
        Persistence : Superblock is persistent
 +
   
 +
        Update Time : Mon Feb  1 21:42:30 2016
 +
              State : clean, degraded
 +
    Active Devices : 1
 +
    Working Devices : 1
 +
    Failed Devices : 0
 +
      Spare Devices : 0
 +
   
 +
              Name : localhost.localdomain:2
 +
              UUID : 3ee2fded:12de8ad4:736bc4ee:b74e8f89
 +
            Events : 4
 +
   
 +
        Number  Major  Minor  RaidDevice State
 +
          0    252        3        0      active sync  /dev/vda3
 +
          2      0        0        2      removed
 +
 +
   
 +
* stop the RAID device:
 +
    # mdadm --stop /dev/md2
 +
    mdadm: stopped /dev/md2
 +
      * check that md2 doesn't exist any more: <code> # mdadm --remove /dev/md2
 +
    mdadm: error opening /dev/md2: No such file or directory
 +
   
 +
* remove the superblocks of vda3 (was previously into the RAID:
 +
    # mdadm --zero-superblock /dev/vda3
 +
 +
* recreate the RAID device md2 with both disks with the UUID and the name of the old RAID:
 +
    # mdadm  --create /dev/md2 --level=1 --raid-devices=2 /dev/vda3 /dev/vdb2 --uuid=3ee2fded:12de8ad4:736bc4ee:b74e8f89 --name=localhost.localdomain:2
 +
    mdadm: Note: this array has metadata at the start and
 +
        may not be suitable as a boot device.  If you plan to
 +
        store '/boot' on this device please ensure that
 +
        your boot-loader understands md/v1.x metadata, or use
 +
        --metadata=0.90
 +
    Continue creating array? y
 +
    mdadm: Defaulting to version 1.2 metadata
 +
    mdadm: array /dev/md2 started.
 +
 +
* The RAID automatically starts to resync:
 +
    # mdadm --detail /dev/md2
 +
    /dev/md2:
 +
            Version : 1.2
 +
      Creation Time : Fri Feb  5 16:17:21 2016
 +
        Raid Level : raid1
 +
        Array Size : 2093120 (2044.41 MiB 2143.35 MB)
 +
      Used Dev Size : 2093120 (2044.41 MiB 2143.35 MB)
 +
      Raid Devices : 2
 +
      Total Devices : 2
 +
        Persistence : Superblock is persistent
 +
   
 +
        Update Time : Fri Feb  5 16:18:03 2016
 +
              State : clean, resyncing
 +
    Active Devices : 2
 +
    Working Devices : 2
 +
    Failed Devices : 0
 +
      Spare Devices : 0
 +
   
 +
      Resync Status : 19% complete
 +
   
 +
              Name : localhost.localdomain:2
 +
              UUID : 3ee2fded:12de8ad4:736bc4ee:b74e8f89
 +
            Events : 3
 +
   
 +
        Number  Major  Minor  RaidDevice State
 +
          0    252        3        0      active sync  /dev/vda3
 +
          1    252      18        1      active sync  /dev/vdb2
 +
   
 +
 +
* Check that the UUID and the name are correct and wait the end of the sync.
Arnaud
41

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