RAID1

sample RAID1 device

• see wiki:TipAndDoc/HA/NFS#mdadm for how to make device

• mitty@ubuntu-haa:~$ sudo mdadm -D /dev/md0

  /dev/md0:
          Version : 00.90
    Creation Time : Thu Mar 24 17:31:36 2011
       Raid Level : raid1
       Array Size : 2047936 (2000.27 MiB 2097.09 MB)
    Used Dev Size : 2047936 (2000.27 MiB 2097.09 MB)
     Raid Devices : 2
    Total Devices : 2
  Preferred Minor : 0
      Persistence : Superblock is persistent
  
      Update Time : Thu Mar 24 21:25:32 2011
            State : clean
   Active Devices : 2
  Working Devices : 2
   Failed Devices : 0
    Spare Devices : 0
  
             UUID : 32578407:6f33f50b:893cf340:745f5dce (local to host ubuntu-haa)
           Events : 0.34
  
      Number   Major   Minor   RaidDevice State
         0       8       17        0      active sync   /dev/sdb1
         1       8       33        1      active sync   /dev/sdc1
  

• mitty@ubuntu-haa:~$ sudo mdadm --stop /dev/md0

  mdadm: stopped /dev/md0
  

• mitty@ubuntu-haa:~$ sudo mdadm -E /dev/sd[bc]1

  /dev/sdb1:
            Magic : a92b4efc
          Version : 00.90.00
             UUID : 32578407:6f33f50b:893cf340:745f5dce (local to host ubuntu-haa)
    Creation Time : Thu Mar 24 17:31:36 2011
       Raid Level : raid1
    Used Dev Size : 2047936 (2000.27 MiB 2097.09 MB)
       Array Size : 2047936 (2000.27 MiB 2097.09 MB)
     Raid Devices : 2
    Total Devices : 2
  Preferred Minor : 0
  
      Update Time : Thu Mar 24 21:25:32 2011
            State : clean
   Active Devices : 2
  Working Devices : 2
   Failed Devices : 0
    Spare Devices : 0
         Checksum : e3889399 - correct
           Events : 34
  
  
        Number   Major   Minor   RaidDevice State
  this     0       8       17        0      active sync   /dev/sdb1
  
     0     0       8       17        0      active sync   /dev/sdb1
     1     1       8       33        1      active sync   /dev/sdc1
  /dev/sdc1:
            Magic : a92b4efc
          Version : 00.90.00
             UUID : 32578407:6f33f50b:893cf340:745f5dce (local to host ubuntu-haa)
    Creation Time : Thu Mar 24 17:31:36 2011
       Raid Level : raid1
    Used Dev Size : 2047936 (2000.27 MiB 2097.09 MB)
       Array Size : 2047936 (2000.27 MiB 2097.09 MB)
     Raid Devices : 2
    Total Devices : 2
  Preferred Minor : 0
  
      Update Time : Thu Mar 24 21:25:32 2011
            State : clean
   Active Devices : 2
  Working Devices : 2
   Failed Devices : 0
    Spare Devices : 0
         Checksum : e38893ab - correct
           Events : 34
  
  
        Number   Major   Minor   RaidDevice State
  this     1       8       33        1      active sync   /dev/sdc1
  
     0     0       8       17        0      active sync   /dev/sdb1
     1     1       8       33        1      active sync   /dev/sdc1