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  1. megaadmin@host17:~$ mdadm --monitor
  2. mdadm: must be super-user to perform this action
  3. megaadmin@host17:~$ sudo mdadm --monitor
  4. [sudo] password for megaadmin:
  5. sudo: unable to open /var/lib/sudo/megaadmin/1: Read-only file system
  6. mdadm: Cannot monitor: need --scan or at least one device
  7. megaadmin@host17:~$ sudo mdadm --scan
  8. [sudo] password for megaadmin:
  9. megaadmin@host17:~$ sudo su
  10. [sudo] password for megaadmin:
  11. sudo: unable to open /var/lib/sudo/megaadmin/1: Read-only file system
  12. bash: /root/.bashrc: Input/output error
  13. root@host17:/home/megaadmin# mdadm --scan
  14. mdadm: --scan does not set the mode, and so cannot be the first option.
  15. root@host17:/home/megaadmin# mdadm --monitor --scan
  16. mdadm: Only one autorebuild process allowed in scan mode, aborting
  17. root@host17:/home/megaadmin# cat /proc/mdstat
  18. Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4] [raid10]
  19. md0 : active raid1 sdb1[1]
  20. 975296 blocks super 1.2 [2/1] [_U]
  21.  
  22. md1 : active raid1 sdb2[1]
  23. 975653696 blocks super 1.2 [2/1] [_U]
  24.  
  25. unused devices: <none>
  26. root@host17:/home/megaadmin# df
  27. Filesystem 1K-blocks Used Available Use% Mounted on
  28. /dev/mapper/vg0-lv1 950728748 4629396 897805056 1% /
  29. udev 4133964 4 4133960 1% /dev
  30. tmpfs 1657464 364 1657100 1% /run
  31. none 5120 0 5120 0% /run/lock
  32. none 4143660 4 4143656 1% /run/shm
  33. /dev/md0 959928 46916 864248 6% /boot
  34. root@host17:/home/megaadmin#
  35. root@host17:/home/megaadmin#
  36. root@host17:/home/megaadmin#
  37. root@host17:/home/megaadmin#
  38. root@host17:/home/megaadmin#
  39. root@host17:/home/megaadmin#
  40. root@host17:/home/megaadmin#
  41. root@host17:/home/megaadmin# cat /proc/mdstat
  42. Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4] [raid10]
  43. md0 : active raid1 sdb1[1]
  44. 975296 blocks super 1.2 [2/1] [_U]
  45.  
  46. md1 : active raid1 sdb2[1]
  47. 975653696 blocks super 1.2 [2/1] [_U]
  48.  
  49. unused devices: <none>
  50. root@host17:/home/megaadmin#
  51. root@host17:/home/megaadmin#
  52. root@host17:/home/megaadmin#
  53. root@host17:/home/megaadmin#
  54. root@host17:/home/megaadmin#
  55. root@host17:/home/megaadmin#
  56. root@host17:/home/megaadmin# ls /dev | grep sd
  57. sda
  58. sda1
  59. sda2
  60. sdb
  61. sdb1
  62. sdb2
  63. root@host17:/home/megaadmin# sudo mdadm --add /dev/md0 /dev/sda1
  64. mdadm: cannot load array metadata from /dev/md0
  65. root@host17:/home/megaadmin# mdadm --query --detail /dev/md0
  66. /dev/md0:
  67. Version : 1.2
  68. Creation Time : Thu Mar 28 13:39:37 2013
  69. Raid Level : raid1
  70. Array Size : 975296 (952.60 MiB 998.70 MB)
  71. Used Dev Size : 975296 (952.60 MiB 998.70 MB)
  72. Raid Devices : 2
  73. Total Devices : 1
  74. Persistence : Superblock is persistent
  75.  
  76. Update Time : Fri May 17 06:37:33 2013
  77. State : clean, degraded
  78. Active Devices : 1
  79. Working Devices : 1
  80. Failed Devices : 0
  81. Spare Devices : 0
  82.  
  83. Number Major Minor RaidDevice State
  84. 0 0 0 0 removed
  85. 1 8 17 1 active sync /dev/sdb1
  86. root@host17:/home/megaadmin# mdadm --examine --scan
  87. ARRAY /dev/md/0 metadata=1.2 UUID=20b3ae7e:8c63b197:530b204d:9f1b5a35 name=host17:0
  88. ARRAY /dev/md/1 metadata=1.2 UUID=1779f85b:0b19b5d0:1156658e:09825749 name=host17:1
  89. root@host17:/home/megaadmin#
  90. root@host17:/home/megaadmin#
  91. root@host17:/home/megaadmin#
  92. root@host17:/home/megaadmin#
  93. root@host17:/home/megaadmin#
  94. root@host17:/home/megaadmin# mdadm --assemble -scan -v
  95. mdadm: looking for devices for further assembly
  96. mdadm: no recogniseable superblock on /dev/dm-3
  97. mdadm: no recogniseable superblock on /dev/dm-2
  98. mdadm: no recogniseable superblock on /dev/dm-1
  99. mdadm: no recogniseable superblock on /dev/dm-0
  100. mdadm: no recogniseable superblock on /dev/md/0
  101. mdadm: no recogniseable superblock on /dev/md/1
  102. mdadm: no recogniseable superblock on /dev/sdb2
  103. mdadm: no recogniseable superblock on /dev/sdb1
  104. mdadm: no recogniseable superblock on /dev/sdb
  105. mdadm: cannot open device /dev/sr0: No medium found
  106. mdadm: no RAID superblock on /dev/sda
  107. mdadm: /dev/sda2 is identified as a member of /dev/md/1_0, slot 0.
  108. mdadm: no uptodate device for slot 1 of /dev/md/1_0
  109. mdadm: added /dev/sda2 to /dev/md/1_0 as 0
  110. mdadm: /dev/md/1_0 has been started with 1 drive (out of 2).
  111.  
  112. mdadm: looking for devices for further assembly
  113. mdadm: /dev/sda1 is identified as a member of /dev/md/0_0, slot 0.
  114. mdadm: no uptodate device for slot 1 of /dev/md/0_0
  115. mdadm: added /dev/sda1 to /dev/md/0_0 as 0
  116. mdadm: /dev/md/0_0 has been started with 1 drive (out of 2).
  117. mdadm: looking for devices for further assembly
  118. mdadm: looking for devices for further assembly
  119. mdadm: no recogniseable superblock on /dev/md/0
  120. mdadm: no recogniseable superblock on /dev/md/1
  121. mdadm: no recogniseable superblock on /dev/dm-3
  122. mdadm: no recogniseable superblock on /dev/dm-2
  123. mdadm: no recogniseable superblock on /dev/dm-1
  124. mdadm: no recogniseable superblock on /dev/dm-0
  125. mdadm: no recogniseable superblock on /dev/md/0
  126. mdadm: no recogniseable superblock on /dev/md1
  127. mdadm: no recogniseable superblock on /dev/sdb2
  128. mdadm: no recogniseable superblock on /dev/sdb1
  129. mdadm: no recogniseable superblock on /dev/sdb
  130. mdadm: cannot open device /dev/sr0: No medium found
  131. mdadm: /dev/sda2 is busy - skipping
  132. mdadm: /dev/sda1 is busy - skipping
  133. mdadm: Cannot assemble mbr metadata on /dev/sda
  134. root@host17:/home/megaadmin#
  135. root@host17:/home/megaadmin#
  136. root@host17:/home/megaadmin#
  137. root@host17:/home/megaadmin#
  138. root@host17:/home/megaadmin# mdadm -A --scan
  139. root@host17:/home/megaadmin#
  140. root@host17:/home/megaadmin#
  141. root@host17:/home/megaadmin# cat /proc/mdstat
  142. Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4] [raid10]
  143. md126 : active raid1 sda1[0]
  144. 975296 blocks super 1.2 [2/1] [U_]
  145.  
  146. md127 : active raid1 sda2[0]
  147. 975653696 blocks super 1.2 [2/1] [U_]
  148.  
  149. md0 : active raid1 sdb1[1]
  150. 975296 blocks super 1.2 [2/1] [_U]
  151.  
  152. md1 : active raid1 sdb2[1]
  153. 975653696 blocks super 1.2 [2/1] [_U]
  154.  
  155. unused devices: <none>
  156. root@host17:/home/megaadmin# df
  157. Filesystem 1K-blocks Used Available Use% Mounted on
  158. /dev/mapper/vg0-lv1 950728748 4629396 897805056 1% /
  159. udev 4133964 4 4133960 1% /dev
  160. tmpfs 1657464 372 1657092 1% /run
  161. none 5120 0 5120 0% /run/lock
  162. none 4143660 4 4143656 1% /run/shm
  163. /dev/md0 959928 46916 864248 6% /boot
  164. root@host17:/home/megaadmin# reboot
  165. bash: /sbin/reboot: Input/output error
  166. root@host17:/home/megaadmin#
  167. root@host17:/home/megaadmin#
  168. root@host17:/home/megaadmin#
  169. root@host17:/home/megaadmin#
  170. root@host17:/home/megaadmin#
  171. root@host17:/home/megaadmin#
  172. root@host17:/home/megaadmin#
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