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  1. root@sysresccd /root % cat /proc/mdstat
  2. Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
  3. md1 : inactive sdb2[2](S) sda2[4](S) sdd2[3](S) sdc2[1](S)
  4.       3905625088 blocks super 1.1
  5.  
  6. md0 : active raid1 sdc1[1] sdd1[3] sdb1[2]
  7.       255936 blocks super 1.0 [4/3] [_UUU]
  8.  
  9. unused devices: <none>
  10.  
  11.  
  12.  
  13. root@sysresccd /root % dmesg | grep raid
  14. [   10.228754] md: raid0 personality registered for level 0
  15. [   10.230465] md: raid1 personality registered for level 1
  16. [   10.255010] raid6: int64x1   2039 MB/s
  17. [   10.272036] raid6: int64x2   2265 MB/s
  18. [   10.289035] raid6: int64x4   1949 MB/s
  19. [   10.306028] raid6: int64x8   1425 MB/s
  20. [   10.323032] raid6: sse2x1    3218 MB/s
  21. [   10.340017] raid6: sse2x2    4085 MB/s
  22. [   10.357021] raid6: sse2x4    6691 MB/s
  23. [   10.357022] raid6: using algorithm sse2x4 (6691 MB/s)
  24. [   10.358839] md: raid6 personality registered for level 6
  25. [   10.358846] md: raid5 personality registered for level 5
  26. [   10.358847] md: raid4 personality registered for level 4
  27. [   10.363035] md: raid10 personality registered for level 10
  28. [   10.750614] md/raid1:md0: active with 3 out of 4 mirrors
  29. [   44.530653] md: invalid raid superblock magic on sda1
  30. root@sysresccd /root %
  31.  
  32.  
  33.  
  34. root@sysresccd /root % dmesg | grep md
  35. [    0.000000] Linux version 3.2.28-std300-amd64 (root@catalyst) (gcc version 4.4.7 (Gentoo 4.4.7 p1.0, pie-0.4.5) ) #2 SMP Tue Aug 21 18:35:38 UTC 2012
  36. [    2.568955] usb usb1: Manufacturer: Linux 3.2.28-std300-amd64 ehci_hcd
  37. [    2.584953] usb usb2: Manufacturer: Linux 3.2.28-std300-amd64 ehci_hcd
  38. [    2.588163] usb usb3: Manufacturer: Linux 3.2.28-std300-amd64 uhci_hcd
  39. [    2.590887] usb usb4: Manufacturer: Linux 3.2.28-std300-amd64 uhci_hcd
  40. [    2.597811] usb usb5: Manufacturer: Linux 3.2.28-std300-amd64 uhci_hcd
  41. [    2.600571] usb usb6: Manufacturer: Linux 3.2.28-std300-amd64 uhci_hcd
  42. [   10.225876] md: linear personality registered for level -1
  43. [   10.227323] md: multipath personality registered for level -4
  44. [   10.228754] md: raid0 personality registered for level 0
  45. [   10.230465] md: raid1 personality registered for level 1
  46. [   10.358839] md: raid6 personality registered for level 6
  47. [   10.358846] md: raid5 personality registered for level 5
  48. [   10.358847] md: raid4 personality registered for level 4
  49. [   10.363035] md: raid10 personality registered for level 10
  50. [   10.733472] md: md0 stopped.
  51. [   10.734535] md: bind<sda1>
  52. [   10.734667] md: bind<sdb1>
  53. [   10.734803] md: bind<sdd1>
  54. [   10.734942] md: bind<sdc1>
  55. [   10.734958] md: kicking non-fresh sda1 from array!
  56. [   10.734963] md: unbind<sda1>
  57. [   10.749093] md: export_rdev(sda1)
  58. [   10.750614] md/raid1:md0: active with 3 out of 4 mirrors
  59. [   10.750641] md0: detected capacity change from 0 to 262078464
  60. [   10.751856]  md0: unknown partition table
  61. [   10.992977] md: md1 stopped.
  62. [   10.994538] md: bind<sdc2>
  63. [   10.994672] md: bind<sdd2>
  64. [   10.994820] md: bind<sda2>
  65. [   10.994982] md: bind<sdb2>
  66. [   44.523203] md: Autodetecting RAID arrays.
  67. [   44.530653] md: invalid raid superblock magic on sda1
  68. [   44.530656] md: sda1 does not have a valid v0.90 superblock, not importing!
  69. [   44.530701] md: could not open unknown-block(8,2).
  70. [   44.530711] md: could not open unknown-block(8,17).
  71. [   44.530714] md: could not open unknown-block(8,18).
  72. [   44.530718] md: could not open unknown-block(8,33).
  73. [   44.530722] md: could not open unknown-block(8,34).
  74. [   44.530726] md: could not open unknown-block(8,49).
  75. [   44.530729] md: could not open unknown-block(8,50).
  76. [   44.530731] md: Scanned 8 and added 0 devices.
  77. [   44.530732] md: autorun ...
  78. [   44.530733] md: ... autorun DONE.
  79.  
  80.  
  81.  
  82.  
  83. root@sysresccd /root % mdadm --assemble --scan -v
  84. mdadm: looking for devices for further assembly
  85. mdadm: no recogniseable superblock on /dev/md/0
  86. mdadm: cannot open device /dev/sr0: No medium found
  87. mdadm: cannot open device /dev/sdd2: Device or resource busy
  88. mdadm: cannot open device /dev/sdd1: Device or resource busy
  89. mdadm: cannot open device /dev/sdd: Device or resource busy
  90. mdadm: cannot open device /dev/sdc2: Device or resource busy
  91. mdadm: cannot open device /dev/sdc1: Device or resource busy
  92. mdadm: cannot open device /dev/sdc: Device or resource busy
  93. mdadm: cannot open device /dev/sdb2: Device or resource busy
  94. mdadm: cannot open device /dev/sdb1: Device or resource busy
  95. mdadm: cannot open device /dev/sdb: Device or resource busy
  96. mdadm: cannot open device /dev/sda2: Device or resource busy
  97. mdadm: cannot open device /dev/sda: Device or resource busy
  98. mdadm: cannot open device /dev/loop0: Device or resource busy
  99. mdadm: /dev/sda1 is identified as a member of /dev/md/localhost.localdomain:0, slot 0.
  100. mdadm: no uptodate device for slot 1 of /dev/md/localhost.localdomain:0
  101. mdadm: no uptodate device for slot 2 of /dev/md/localhost.localdomain:0
  102. mdadm: no uptodate device for slot 3 of /dev/md/localhost.localdomain:0
  103. mdadm: added /dev/sda1 to /dev/md/localhost.localdomain:0 as 0
  104. mdadm: /dev/md/localhost.localdomain:0 has been started with 1 drive (out of 4).
  105. mdadm: looking for devices for further assembly
  106. mdadm: looking for devices for further assembly
  107. mdadm: no recogniseable superblock on /dev/md/0
  108. mdadm: no recogniseable superblock on /dev/md/0
  109. mdadm: cannot open device /dev/sr0: No medium found
  110. mdadm: cannot open device /dev/sdd2: Device or resource busy
  111. mdadm: cannot open device /dev/sdd1: Device or resource busy
  112. mdadm: cannot open device /dev/sdd: Device or resource busy
  113. mdadm: cannot open device /dev/sdc2: Device or resource busy
  114. mdadm: cannot open device /dev/sdc1: Device or resource busy
  115. mdadm: cannot open device /dev/sdc: Device or resource busy
  116. mdadm: cannot open device /dev/sdb2: Device or resource busy
  117. mdadm: cannot open device /dev/sdb1: Device or resource busy
  118. mdadm: cannot open device /dev/sdb: Device or resource busy
  119. mdadm: cannot open device /dev/sda2: Device or resource busy
  120. mdadm: cannot open device /dev/sda1: Device or resource busy
  121. mdadm: cannot open device /dev/sda: Device or resource busy
  122. mdadm: cannot open device /dev/loop0: Device or resource busy
  123.  
  124.  
  125. root@sysresccd /root % mdadm --examine /dev/sd[abcd]2
  126. /dev/sda2:
  127.           Magic : a92b4efc
  128.         Version : 1.1
  129.     Feature Map : 0x1
  130.      Array UUID : 160f35df:54055a13:77806c03:b12aea12
  131.            Name : localhost.localdomain:1
  132.   Creation Time : Thu Sep 12 02:37:10 2013
  133.      Raid Level : raid10
  134.    Raid Devices : 4
  135.  
  136.  Avail Dev Size : 1953007616 (931.27 GiB 999.94 GB)
  137.      Array Size : 3905492992 (1862.28 GiB 1999.61 GB)
  138.   Used Dev Size : 1952746496 (931.14 GiB 999.81 GB)
  139.     Data Offset : 2048 sectors
  140.    Super Offset : 0 sectors
  141.           State : clean
  142.     Device UUID : ae4e65b3:95c4da54:d295cf4c:de32e851
  143.  
  144. Internal Bitmap : 8 sectors from superblock
  145.     Update Time : Mon Oct 21 02:21:07 2013
  146.        Checksum : f86dd3de - correct
  147.          Events : 0
  148.  
  149.          Layout : near=2
  150.      Chunk Size : 512K
  151.  
  152.    Device Role : spare
  153.    Array State : ..AA ('A' == active, '.' == missing)
  154. /dev/sdb2:
  155.           Magic : a92b4efc
  156.         Version : 1.1
  157.     Feature Map : 0x1
  158.      Array UUID : 160f35df:54055a13:77806c03:b12aea12
  159.            Name : localhost.localdomain:1
  160.   Creation Time : Thu Sep 12 02:37:10 2013
  161.      Raid Level : raid10
  162.    Raid Devices : 4
  163.  
  164.  Avail Dev Size : 1952747520 (931.14 GiB 999.81 GB)
  165.      Array Size : 3905492992 (1862.28 GiB 1999.61 GB)
  166.   Used Dev Size : 1952746496 (931.14 GiB 999.81 GB)
  167.     Data Offset : 262144 sectors
  168.    Super Offset : 0 sectors
  169.           State : clean
  170.     Device UUID : 9fdb73ad:ab3b67ef:62cf56cb:48a7cbae
  171.  
  172. Internal Bitmap : 8 sectors from superblock
  173.     Update Time : Mon Oct 21 02:21:07 2013
  174.        Checksum : 6873c900 - correct
  175.          Events : 17186
  176.  
  177.          Layout : near=2
  178.      Chunk Size : 512K
  179.  
  180.    Device Role : Active device 2
  181.    Array State : ..AA ('A' == active, '.' == missing)
  182. /dev/sdc2:
  183.           Magic : a92b4efc
  184.         Version : 1.1
  185.     Feature Map : 0x1
  186.      Array UUID : 160f35df:54055a13:77806c03:b12aea12
  187.            Name : localhost.localdomain:1
  188.   Creation Time : Thu Sep 12 02:37:10 2013
  189.      Raid Level : raid10
  190.    Raid Devices : 4
  191.  
  192.  Avail Dev Size : 1952747520 (931.14 GiB 999.81 GB)
  193.      Array Size : 3905492992 (1862.28 GiB 1999.61 GB)
  194.   Used Dev Size : 1952746496 (931.14 GiB 999.81 GB)
  195.     Data Offset : 262144 sectors
  196.    Super Offset : 0 sectors
  197.           State : clean
  198.     Device UUID : 5d5f5fbf:4b2140f9:3f622131:79f52f32
  199.  
  200. Internal Bitmap : 8 sectors from superblock
  201.     Update Time : Mon Oct 21 02:08:42 2013
  202.        Checksum : 6d691077 - correct
  203.          Events : 17175
  204.  
  205.          Layout : near=2
  206.      Chunk Size : 512K
  207.  
  208.    Device Role : Active device 1
  209.    Array State : AAAA ('A' == active, '.' == missing)
  210. /dev/sdd2:
  211.           Magic : a92b4efc
  212.         Version : 1.1
  213.     Feature Map : 0x1
  214.      Array UUID : 160f35df:54055a13:77806c03:b12aea12
  215.            Name : localhost.localdomain:1
  216.   Creation Time : Thu Sep 12 02:37:10 2013
  217.      Raid Level : raid10
  218.    Raid Devices : 4
  219.  
  220.  Avail Dev Size : 1952747520 (931.14 GiB 999.81 GB)
  221.      Array Size : 3905492992 (1862.28 GiB 1999.61 GB)
  222.   Used Dev Size : 1952746496 (931.14 GiB 999.81 GB)
  223.     Data Offset : 262144 sectors
  224.    Super Offset : 0 sectors
  225.           State : clean
  226.     Device UUID : 57e6e332:c199a57b:94846dd1:5551635d
  227.  
  228. Internal Bitmap : 8 sectors from superblock
  229.     Update Time : Mon Oct 21 02:21:07 2013
  230.        Checksum : 2ed0910d - correct
  231.          Events : 17186
  232.  
  233.          Layout : near=2
  234.      Chunk Size : 512K
  235.  
  236.    Device Role : Active device 3
  237.    Array State : ..AA ('A' == active, '.' == missing)
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