rune@rune-desktop:~$ cat /proc/mdstat
Personalities : [raid0] [linear] [multipath] [raid1] [raid6] [raid5] [raid4] [raid10]
md0 : active raid0 sdd1[1] sdc1[0]
      1953522688 blocks super 1.2 512k chunks

md2 : active (auto-read-only) raid1 sdb1[0]
      1953382488 blocks super 1.2 [2/1] [U_]

unused devices: <none>

rune@rune-desktop:~$ sudo mdadm --detail /dev/md0
/dev/md0:
        Version : 1.2
  Creation Time : Sun Aug 25 21:14:24 2013
     Raid Level : raid0
     Array Size : 1953522688 (1863.02 GiB 2000.41 GB)
   Raid Devices : 2
  Total Devices : 2
    Persistence : Superblock is persistent

    Update Time : Sun Aug 25 21:14:24 2013
          State : clean
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

     Chunk Size : 512K

           Name : rune-desktop:0  (local to host rune-desktop)
           UUID : 4d8bea96:08136ba8:75029197:fe2e2a4b
         Events : 0

    Number   Major   Minor   RaidDevice State
       0       8       33        0      active sync   /dev/sdc1
       1       8       49        1      active sync   /dev/sdd1

rune@rune-desktop:~$ sudo mdadm --detail /dev/md2
/dev/md2:
        Version : 1.2
  Creation Time : Sun Aug 25 11:13:35 2013
     Raid Level : raid1
     Array Size : 1953382488 (1862.89 GiB 2000.26 GB)
  Used Dev Size : 1953382488 (1862.89 GiB 2000.26 GB)
   Raid Devices : 2
  Total Devices : 1
    Persistence : Superblock is persistent

    Update Time : Tue Aug 27 13:53:26 2013
          State : clean, degraded
 Active Devices : 1
Working Devices : 1
 Failed Devices : 0
  Spare Devices : 0

           Name : rune-desktop:2  (local to host rune-desktop)
           UUID : 494e7219:c094f19f:97e26ffa:e09020d3
         Events : 21572

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

rune@rune-desktop:~$ cat /etc/mdadm/mdadm.conf |egrep -v "^#|^$"
CREATE owner=root group=disk mode=0660 auto=yes
HOMEHOST <system>
ARRAY /dev/md/stripe UUID=4d8bea96:08136ba8:75029197:fe2e2a4b
ARRAY /dev/md/mirror UUID=494e7219:c094f19f:97e26ffa:e09020d3

rune@rune-desktop:~$ ls -lR /dev/md*
brw-rw---- 1 root disk 9, 0 Aug 27 13:53 /dev/md0
brw-rw---- 1 root disk 9, 2 Aug 27 13:53 /dev/md2

/dev/md:
total 0
lrwxrwxrwx 1 root root 6 Aug 27 13:53 mirror -> ../md2
lrwxrwxrwx 1 root root 6 Aug 27 13:53 stripe -> ../md0

rune@rune-desktop:~$ cat /var/log/syslog|grep md
Aug 27 13:53:55 rune-desktop kernel: [    1.951554] md: bind<sdb1>
Aug 27 13:53:55 rune-desktop kernel: [    1.963945] md: bind<sdc1>
Aug 27 13:53:55 rune-desktop kernel: [    2.037996] md: bind<sdd1>
Aug 27 13:53:55 rune-desktop kernel: [    2.039478] md: raid0 personality registered for level 0
Aug 27 13:53:55 rune-desktop kernel: [    2.039587] md/raid0:md0: md_size is 3907045376 sectors.
Aug 27 13:53:55 rune-desktop kernel: [    2.039594] md: RAID0 configuration for md0 - 1 zone
Aug 27 13:53:55 rune-desktop kernel: [    2.039595] md: zone0=[sdc1/sdd1]
Aug 27 13:53:55 rune-desktop kernel: [    2.039604] md0: detected capacity change from 0 to 2000407232512
Aug 27 13:53:55 rune-desktop kernel: [    2.040887]  md0: unknown partition table
Aug 27 13:53:55 rune-desktop kernel: [    2.431498] md: linear personality registered for level -1
Aug 27 13:53:55 rune-desktop kernel: [    2.433330] md: multipath personality registered for level -4
Aug 27 13:53:55 rune-desktop kernel: [    2.435846] md: raid1 personality registered for level 1
Aug 27 13:53:55 rune-desktop kernel: [    2.680802] md: raid6 personality registered for level 6
Aug 27 13:53:55 rune-desktop kernel: [    2.680804] md: raid5 personality registered for level 5
Aug 27 13:53:55 rune-desktop kernel: [    2.680805] md: raid4 personality registered for level 4
Aug 27 13:53:55 rune-desktop kernel: [    2.684732] md: raid10 personality registered for level 10
Aug 27 13:53:55 rune-desktop kernel: [    4.733765] md/raid1:md2: active with 1 out of 2 mirrors
Aug 27 13:53:55 rune-desktop kernel: [    4.733792] md2: detected capacity change from 0 to 2000263667712
Aug 27 13:53:55 rune-desktop kernel: [    4.760451]  md2: unknown partition table
Aug 27 13:53:56 rune-desktop mdadm[1646]: DegradedArray event detected on md device /dev/md/mirror
Aug 27 13:53:56 rune-desktop mdadm[1646]: DeviceDisappeared event detected on md device /dev/md/stripe, component device Wrong-Level
Aug 27 13:53:57 rune-desktop dbus[707]: [system] Activating service name='org.freedesktop.systemd1' (using servicehelper)
Aug 27 13:53:57 rune-desktop dbus[707]: [system] Successfully activated service 'org.freedesktop.systemd1'
Aug 27 13:54:02 rune-desktop udisksd[2697]: Error creating watch for file /sys/devices/virtual/block/md0/md/sync_action: No such file or directory (g-file-error-quark, 4)
Aug 27 13:54:02 rune-desktop udisksd[2697]: Error creating watch for file /sys/devices/virtual/block/md0/md/degraded: No such file or directory (g-file-error-quark, 4)