[[PageOutline]]

 = 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
}}}