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ubuntu 14.01 - file system corruption(lvm)

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Apr 1st, 2016
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  1. root@ubuntu:~# dmsetup resume root_vg-root
  2. device-mapper: resume ioctl on root_vg-root failed: Invalid argument
  3. Command failed
  4. root@ubuntu:~# dmsetup resume root_vg-root
  5. device-mapper: resume ioctl on root_vg-root failed: Invalid argument
  6. Command failed
  7. root@ubuntu:~# dmsetup info
  8. Name: root_vg-root
  9. State: SUSPENDED
  10. Read Ahead: 256
  11. Tables present: None
  12. Open count: 0
  13. Event number: 0
  14. Major, minor: 252, 0
  15. Number of targets: 0
  16. UUID: LVM-2z70QAEyRN2uvNSb5hKk0brY8qrIfJA2eYiD8ovpnfIkCbmvySL24KJ2YCAeLzis
  17.  
  18. Name: root_vg-swap_1
  19. State: ACTIVE
  20. Read Ahead: 256
  21. Tables present: LIVE
  22. Open count: 0
  23. Event number: 0
  24. Major, minor: 252, 1
  25. Number of targets: 1
  26. UUID: LVM-2z70QAEyRN2uvNSb5hKk0brY8qrIfJA2m0dtIkdziEWcnmPoRPb7rUyMFoCp6zqM
  27.  
  28. Name: root_vg-lv_var_opt
  29. State: ACTIVE
  30. Read Ahead: 256
  31. Tables present: LIVE
  32. Open count: 0
  33. Event number: 0
  34. Major, minor: 252, 2
  35. Number of targets: 1
  36. UUID: LVM-2z70QAEyRN2uvNSb5hKk0brY8qrIfJA2bwcezdMwgUuVDLmnJtJ0EIb2x8A2C8U5
  37.  
  38. root@ubuntu:~# dmsetup resume root_vg-root
  39. device-mapper: resume ioctl on root_vg-root failed: Invalid argument
  40. Command failed
  41. root@ubuntu:~# pvs -a -v
  42. Using physical volume(s) on command line.
  43. Found same device /dev/sda5 with same pvid OgbrGhm632xfDN2LPzYOfVa92ltnGdAJ
  44. PV VG Fmt Attr PSize PFree DevSize PV UUID
  45. /dev/loop0 --- 0 0 1.05g
  46. /dev/ram0 --- 0 0 64.00m
  47. /dev/ram1 --- 0 0 64.00m
  48. /dev/ram10 --- 0 0 64.00m
  49. /dev/ram11 --- 0 0 64.00m
  50. /dev/ram12 --- 0 0 64.00m
  51. /dev/ram13 --- 0 0 64.00m
  52. /dev/ram14 --- 0 0 64.00m
  53. /dev/ram15 --- 0 0 64.00m
  54. /dev/ram2 --- 0 0 64.00m
  55. /dev/ram3 --- 0 0 64.00m
  56. /dev/ram4 --- 0 0 64.00m
  57. /dev/ram5 --- 0 0 64.00m
  58. /dev/ram6 --- 0 0 64.00m
  59. /dev/ram7 --- 0 0 64.00m
  60. /dev/ram8 --- 0 0 64.00m
  61. /dev/ram9 --- 0 0 64.00m
  62. /dev/root_vg/lv_var_opt --- 0 0 200.00g
  63. /dev/root_vg/swap_1 --- 0 0 15.89g
  64. /dev/sda1 --- 0 0 243.00m
  65. /dev/sda3 --- 0 0 244.61g
  66. /dev/sda5 root_vg lvm2 a-- 512.00g 56.10g 476.60g OgbrGh-m632-xfDN-2LPz-YOfV-a92l-tnGdAJ
  67. /dev/sdb1 --- 0 0 1.10g
  68. /dev/sdb2 --- 0 0 2.22m
  69. root@ubuntu:~#
  70.  
  71. @ubuntu:~# parted -l
  72. Model: ATA Samsung SSD 850 (scsi)
  73. Disk /dev/sda: 1000GB
  74. Sector size (logical/physical): 512B/512B
  75. Partition Table: msdos
  76. Disk Flags:
  77.  
  78. Number Start End Size Type File system Flags
  79. 1 1049kB 256MB 255MB primary ext2 boot
  80. 2 257MB 512GB 512GB extended
  81. 5 257MB 512GB 512GB logical lvm
  82. 3 738GB 1000GB 263GB primary ext4
  83.  
  84.  
  85. Warning: The driver descriptor says the physical block size is 2048 bytes, but
  86. Linux says it is 512 bytes.
  87. Ignore/Cancel? I
  88. Model: PNY USB 2.0 FD (scsi)
  89. Disk /dev/sdb: 32.7GB
  90. Sector size (logical/physical): 2048B/512B
  91. Partition Table: mac
  92. Disk Flags:
  93.  
  94. Number Start End Size File system Name Flags
  95. 1 2048B 6143B 4096B Apple
  96. 2 1167MB 1169MB 2327kB EFI
  97.  
  98.  
  99. Model: Linux device-mapper (linear) (dm)
  100. Disk /dev/mapper/root_vg-lv_var_opt: 215GB
  101. Sector size (logical/physical): 512B/512B
  102. Partition Table: loop
  103. Disk Flags:
  104.  
  105. Number Start End Size File system Flags
  106. 1 0.00B 215GB 215GB ext4
  107.  
  108.  
  109. Model: Linux device-mapper (linear) (dm)
  110. Disk /dev/mapper/root_vg-swap_1: 17.1GB
  111. Sector size (logical/physical): 512B/512B
  112. Partition Table: loop
  113. Disk Flags:
  114.  
  115. Number Start End Size File system Flags
  116. 1 0.00B 17.1GB 17.1GB linux-swap(v1)
  117.  
  118.  
  119. @ubuntu:~# fdisk -l /dev/sda
  120. Disk /dev/sda: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors
  121. Units: sectors of 1 * 512 = 512 bytes
  122. Sector size (logical/physical): 512 bytes / 512 bytes
  123. I/O size (minimum/optimal): 512 bytes / 512 bytes
  124. Disklabel type: dos
  125. Disk identifier: 0x000d8608
  126.  
  127. Device Boot Start End Sectors Size Id Type
  128. /dev/sda1 * 2048 499711 497664 243M 83 Linux
  129. /dev/sda2 501758 1000000000 999498243 476.6G 5 Extended
  130. /dev/sda3 1440530432 1953525167 512994736 244.6G 83 Linux
  131. /dev/sda5 501760 999999487 999497728 476.6G 8e Linux LVM
  132.  
  133. Partition table entries are not in disk order.
  134.  
  135. @ubuntu:~# pvdisplay
  136. --- Physical volume ---
  137. PV Name /dev/sda5
  138. VG Name root_vg
  139. PV Size 512.00 GiB / not usable 3.00 MiB
  140. Allocatable yes
  141. PE Size 4.00 MiB
  142. Total PE 131071
  143. Free PE 14362
  144. Allocated PE 116709
  145. PV UUID OgbrGh-m632-xfDN-2LPz-YOfV-a92l-tnGdAJ
  146.  
  147.  
  148. @ubuntu:~# vgdisplay
  149. --- Volume group ---
  150. VG Name root_vg
  151. System ID
  152. Format lvm2
  153. Metadata Areas 1
  154. Metadata Sequence No 20
  155. VG Access read/write
  156. VG Status resizable
  157. MAX LV 0
  158. Cur LV 3
  159. Open LV 1
  160. Max PV 0
  161. Cur PV 1
  162. Act PV 1
  163. VG Size 512.00 GiB
  164. PE Size 4.00 MiB
  165. Total PE 131071
  166. Alloc PE / Size 116709 / 455.89 GiB
  167. Free PE / Size 14362 / 56.10 GiB
  168. VG UUID 2z70QA-EyRN-2uvN-Sb5h-Kk0b-rY8q-rIfJA2
  169.  
  170.  
  171. @ubuntu:~# lvdisplay
  172. --- Logical volume ---
  173. LV Path /dev/root_vg/root
  174. LV Name root
  175. VG Name root_vg
  176. LV UUID eYiD8o-vpnf-IkCb-mvyS-L24K-J2YC-AeLzis
  177. LV Write Access read/write
  178. LV Creation host, time ubuntu, 2014-03-04 02:47:55 +0000
  179. LV Status suspended
  180. # open 0
  181. LV Size 240.00 GiB
  182. Current LE 61440
  183. Segments 2
  184. Allocation inherit
  185. Read ahead sectors auto
  186. - currently set to 256
  187. Block device 252:0
  188.  
  189. --- Logical volume ---
  190. LV Path /dev/root_vg/swap_1
  191. LV Name swap_1
  192. VG Name root_vg
  193. LV UUID m0dtIk-dziE-Wcnm-PoRP-b7rU-yMFo-Cp6zqM
  194. LV Write Access read/write
  195. LV Creation host, time ubuntu, 2014-03-04 02:47:55 +0000
  196. LV Status available
  197. # open 0
  198. LV Size 15.89 GiB
  199. Current LE 4069
  200. Segments 1
  201. Allocation inherit
  202. Read ahead sectors auto
  203. - currently set to 256
  204. Block device 252:1
  205.  
  206. --- Logical volume ---
  207. LV Path /dev/root_vg/lv_var_opt
  208. LV Name lv_var_opt
  209. VG Name root_vg
  210. LV UUID bwcezd-MwgU-uVDL-mnJt-J0EI-b2x8-A2C8U5
  211. LV Write Access read/write
  212. LV Creation host, time nimbus, 2015-03-18 03:39:40 +0000
  213. LV Status available
  214. # open 1
  215. LV Size 200.00 GiB
  216. Current LE 51200
  217. Segments 1
  218. Allocation inherit
  219. Read ahead sectors auto
  220. - currently set to 256
  221. Block device 252:2
  222.  
  223.  
  224. @ubuntu:~# pvscan
  225. PV /dev/sda5 VG root_vg lvm2 [512.00 GiB / 56.10 GiB free]
  226. Total: 1 [512.00 GiB] / in use: 1 [512.00 GiB] / in no VG: 0 [0 ]
  227.  
  228. @ubuntu:~# vgscan
  229. Reading all physical volumes. This may take a while...
  230. Found volume group "root_vg" using metadata type lvm2
  231.  
  232. @ubuntu:~# lvscan
  233. ACTIVE '/dev/root_vg/root' [240.00 GiB] inherit
  234. ACTIVE '/dev/root_vg/swap_1' [15.89 GiB] inherit
  235. ACTIVE '/dev/root_vg/lv_var_opt' [200.00 GiB] inherit
  236.  
  237. @ubuntu:~# pvs
  238. PV VG Fmt Attr PSize PFree
  239. /dev/sda5 root_vg lvm2 a-- 512.00g 56.10g
  240.  
  241. @ubuntu:~# vgs
  242. VG #PV #LV #SN Attr VSize VFree
  243. root_vg 1 3 0 wz--n- 512.00g 56.10g
  244.  
  245. @ubuntu:~# lvs
  246. LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
  247. lv_var_opt root_vg -wi-ao---- 200.00g
  248. root root_vg -wi-s----- 240.00g
  249. swap_1 root_vg -wi-a----- 15.89g
  250.  
  251. @ubuntu:~# e2fsck /dev/root_vg/root
  252. e2fsck 1.42.12 (29-Aug-2014)
  253. e2fsck: No such file or directory while trying to open /dev/root_vg/root
  254. Possibly non-existent device?
  255.  
  256.  
  257. @ubuntu:~# dumpe2fs -h /dev/root_vg/root
  258. dumpe2fs 1.42.12 (29-Aug-2014)
  259. dumpe2fs: No such file or directory while trying to open /dev/root_vg/root
  260. Couldn't find valid filesystem superblock.
  261.  
  262. @ubuntu:~# dumpe2fs -h /dev/root_vg/lv_var_opt
  263. dumpe2fs 1.42.12 (29-Aug-2014)
  264. Filesystem volume name: <none>
  265. Last mounted on: /media/ubuntu/835a2e08-3bd8-4b69-905c-4d89c94f38e1
  266. Filesystem UUID: 835a2e08-3bd8-4b69-905c-4d89c94f38e1
  267. Filesystem magic number: 0xEF53
  268. Filesystem revision #: 1 (dynamic)
  269. Filesystem features: has_journal ext_attr resize_inode dir_index filetype needs_recovery extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize
  270. Filesystem flags: signed_directory_hash
  271. Default mount options: user_xattr acl
  272. Filesystem state: clean
  273. Errors behavior: Continue
  274. Filesystem OS type: Linux
  275. Inode count: 13107200
  276. Block count: 52428800
  277. Reserved block count: 2304246
  278. Free blocks: 20977115
  279. Free inodes: 13085168
  280. First block: 0
  281. Block size: 4096
  282. Fragment size: 4096
  283. Reserved GDT blocks: 1011
  284. Blocks per group: 32768
  285. Fragments per group: 32768
  286. Inodes per group: 8192
  287. Inode blocks per group: 512
  288. RAID stride: 32744
  289. Flex block group size: 16
  290. Filesystem created: Wed Mar 18 03:44:05 2015
  291. Last mount time: Thu Mar 31 22:35:13 2016
  292. Last write time: Thu Mar 31 22:35:13 2016
  293. Mount count: 2
  294. Maximum mount count: -1
  295. Last checked: Tue Mar 22 18:15:07 2016
  296. Check interval: 0 (<none>)
  297. Lifetime writes: 3538 GB
  298. Reserved blocks uid: 0 (user root)
  299. Reserved blocks gid: 0 (group root)
  300. First inode: 11
  301. Inode size: 256
  302. Required extra isize: 28
  303. Desired extra isize: 28
  304. Journal inode: 8
  305. Default directory hash: half_md4
  306. Directory Hash Seed: 420fb49b-9628-4afc-9f31-c3af313ac8c0
  307. Journal backup: inode blocks
  308. Journal features: journal_incompat_revoke
  309. Journal size: 128M
  310. Journal length: 32768
  311. Journal sequence: 0x00199921
  312. Journal start: 1
  313.  
  314. root@ubuntu:/etc/lvm/backup# vgcfgrestore -v --file /etc/lvm/archive/root_vg_00000-186308340.vg root_vg
  315. Found same device /dev/sda5 with same pvid OgbrGhm632xfDN2LPzYOfVa92ltnGdAJ
  316. Restored volume group root_vg
  317.  
  318.  
  319. @ubuntu:~# fdisk -l /dev/sda
  320. Disk /dev/sda: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors
  321. Units: sectors of 1 * 512 = 512 bytes
  322. Sector size (logical/physical): 512 bytes / 512 bytes
  323. I/O size (minimum/optimal): 512 bytes / 512 bytes
  324. Disklabel type: dos
  325. Disk identifier: 0x000d8608
  326.  
  327. Device Boot Start End Sectors Size Id Type
  328. /dev/sda1 * 2048 499711 497664 243M 83 Linux
  329. /dev/sda2 501758 1000000000 999498243 476.6G 5 Extended
  330. /dev/sda3 1440530432 1953525167 512994736 244.6G 83 Linux
  331. /dev/sda5 501760 999999487 999497728 476.6G 8e Linux LVM
  332.  
  333. Partition table entries are not in disk order.
  334.  
  335. @ubuntu:~# pvdisplay
  336. --- Physical volume ---
  337. PV Name /dev/sda5
  338. VG Name root_vg
  339. PV Size 512.00 GiB / not usable 3.00 MiB
  340. Allocatable yes
  341. PE Size 4.00 MiB
  342. Total PE 131071
  343. Free PE 14362
  344. Allocated PE 116709
  345. PV UUID OgbrGh-m632-xfDN-2LPz-YOfV-a92l-tnGdAJ
  346.  
  347.  
  348. @ubuntu:~# vgdisplay
  349. --- Volume group ---
  350. VG Name root_vg
  351. System ID
  352. Format lvm2
  353. Metadata Areas 1
  354. Metadata Sequence No 20
  355. VG Access read/write
  356. VG Status resizable
  357. MAX LV 0
  358. Cur LV 3
  359. Open LV 1
  360. Max PV 0
  361. Cur PV 1
  362. Act PV 1
  363. VG Size 512.00 GiB
  364. PE Size 4.00 MiB
  365. Total PE 131071
  366. Alloc PE / Size 116709 / 455.89 GiB
  367. Free PE / Size 14362 / 56.10 GiB
  368. VG UUID 2z70QA-EyRN-2uvN-Sb5h-Kk0b-rY8q-rIfJA2
  369.  
  370.  
  371. @ubuntu:~# lvdisplay
  372. --- Logical volume ---
  373. LV Path /dev/root_vg/root
  374. LV Name root
  375. VG Name root_vg
  376. LV UUID eYiD8o-vpnf-IkCb-mvyS-L24K-J2YC-AeLzis
  377. LV Write Access read/write
  378. LV Creation host, time ubuntu, 2014-03-04 02:47:55 +0000
  379. LV Status suspended
  380. # open 0
  381. LV Size 240.00 GiB
  382. Current LE 61440
  383. Segments 2
  384. Allocation inherit
  385. Read ahead sectors auto
  386. - currently set to 256
  387. Block device 252:0
  388.  
  389. --- Logical volume ---
  390. LV Path /dev/root_vg/swap_1
  391. LV Name swap_1
  392. VG Name root_vg
  393. LV UUID m0dtIk-dziE-Wcnm-PoRP-b7rU-yMFo-Cp6zqM
  394. LV Write Access read/write
  395. LV Creation host, time ubuntu, 2014-03-04 02:47:55 +0000
  396. LV Status available
  397. # open 0
  398. LV Size 15.89 GiB
  399. Current LE 4069
  400. Segments 1
  401. Allocation inherit
  402. Read ahead sectors auto
  403. - currently set to 256
  404. Block device 252:1
  405.  
  406. --- Logical volume ---
  407. LV Path /dev/root_vg/lv_var_opt
  408. LV Name lv_var_opt
  409. VG Name root_vg
  410. LV UUID bwcezd-MwgU-uVDL-mnJt-J0EI-b2x8-A2C8U5
  411. LV Write Access read/write
  412. LV Creation host, time nimbus, 2015-03-18 03:39:40 +0000
  413. LV Status available
  414. # open 1
  415. LV Size 200.00 GiB
  416. Current LE 51200
  417. Segments 1
  418. Allocation inherit
  419. Read ahead sectors auto
  420. - currently set to 256
  421. Block device 252:2
  422.  
  423.  
  424. @ubuntu:~# pvscan
  425. PV /dev/sda5 VG root_vg lvm2 [512.00 GiB / 56.10 GiB free]
  426. Total: 1 [512.00 GiB] / in use: 1 [512.00 GiB] / in no VG: 0 [0 ]
  427.  
  428. @ubuntu:~# vgscan
  429. Reading all physical volumes. This may take a while...
  430. Found volume group "root_vg" using metadata type lvm2
  431.  
  432. @ubuntu:~# lvscan
  433. ACTIVE '/dev/root_vg/root' [240.00 GiB] inherit
  434. ACTIVE '/dev/root_vg/swap_1' [15.89 GiB] inherit
  435. ACTIVE '/dev/root_vg/lv_var_opt' [200.00 GiB] inherit
  436.  
  437. @ubuntu:~# pvs
  438. PV VG Fmt Attr PSize PFree
  439. /dev/sda5 root_vg lvm2 a-- 512.00g 56.10g
  440.  
  441. @ubuntu:~# vgs
  442. VG #PV #LV #SN Attr VSize VFree
  443. root_vg 1 3 0 wz--n- 512.00g 56.10g
  444.  
  445. @ubuntu:~# lvs
  446. LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
  447. lv_var_opt root_vg -wi-ao---- 200.00g
  448. root root_vg -wi-s----- 240.00g
  449. swap_1 root_vg -wi-a----- 15.89g
  450.  
  451. @ubuntu:~# e2fsck /dev/root_vg/root
  452. e2fsck 1.42.12 (29-Aug-2014)
  453. e2fsck: No such file or directory while trying to open /dev/root_vg/root
  454. Possibly non-existent device?
  455.  
  456.  
  457. @ubuntu:~# dumpe2fs -h /dev/root_vg/root
  458. dumpe2fs 1.42.12 (29-Aug-2014)
  459. dumpe2fs: No such file or directory while trying to open /dev/root_vg/root
  460. Couldn't find valid filesystem superblock.
  461.  
  462. @ubuntu:~# dumpe2fs -h /dev/root_vg/lv_var_opt
  463. dumpe2fs 1.42.12 (29-Aug-2014)
  464. Filesystem volume name: <none>
  465. Last mounted on: /media/ubuntu/835a2e08-3bd8-4b69-905c-4d89c94f38e1
  466. Filesystem UUID: 835a2e08-3bd8-4b69-905c-4d89c94f38e1
  467. Filesystem magic number: 0xEF53
  468. Filesystem revision #: 1 (dynamic)
  469. Filesystem features: has_journal ext_attr resize_inode dir_index filetype needs_recovery extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize
  470. Filesystem flags: signed_directory_hash
  471. Default mount options: user_xattr acl
  472. Filesystem state: clean
  473. Errors behavior: Continue
  474. Filesystem OS type: Linux
  475. Inode count: 13107200
  476. Block count: 52428800
  477. Reserved block count: 2304246
  478. Free blocks: 20977115
  479. Free inodes: 13085168
  480. First block: 0
  481. Block size: 4096
  482. Fragment size: 4096
  483. Reserved GDT blocks: 1011
  484. Blocks per group: 32768
  485. Fragments per group: 32768
  486. Inodes per group: 8192
  487. Inode blocks per group: 512
  488. RAID stride: 32744
  489. Flex block group size: 16
  490. Filesystem created: Wed Mar 18 03:44:05 2015
  491. Last mount time: Thu Mar 31 22:35:13 2016
  492. Last write time: Thu Mar 31 22:35:13 2016
  493. Mount count: 2
  494. Maximum mount count: -1
  495. Last checked: Tue Mar 22 18:15:07 2016
  496. Check interval: 0 (<none>)
  497. Lifetime writes: 3538 GB
  498. Reserved blocks uid: 0 (user root)
  499. Reserved blocks gid: 0 (group root)
  500. First inode: 11
  501. Inode size: 256
  502. Required extra isize: 28
  503. Desired extra isize: 28
  504. Journal inode: 8
  505. Default directory hash: half_md4
  506. Directory Hash Seed: 420fb49b-9628-4afc-9f31-c3af313ac8c0
  507. Journal backup: inode blocks
  508. Journal features: journal_incompat_revoke
  509. Journal size: 128M
  510. Journal length: 32768
  511. Journal sequence: 0x00199921
  512. Journal start: 1
  513.  
  514. root@ubuntu:/etc/lvm/backup# vgcfgrestore -v --file /etc/lvm/archive/root_vg_00000-186308340.vg root_vg
  515. Found same device /dev/sda5 with same pvid OgbrGhm632xfDN2LPzYOfVa92ltnGdAJ
  516. Restored volume group root_vg
  517.  
  518. root@ubuntu:~# e2fsck /dev/root_vg/root
  519. e2fsck 1.42.12 (29-Aug-2014)
  520. e2fsck: Invalid argument while trying to open /dev/root_vg/root
  521.  
  522. The superblock could not be read or does not describe a valid ext2/ext3/ext4
  523. filesystem. If the device is valid and it really contains an ext2/ext3/ext4
  524. filesystem (and not swap or ufs or something else), then the superblock
  525. is corrupt, and you might try running e2fsck with an alternate superblock:
  526. e2fsck -b 8193 <device>
  527. or
  528. e2fsck -b 32768 <device>
  529.  
  530. root@ubuntu:~# e2fsck -b 8193 /dev/root_vg/root
  531. e2fsck 1.42.12 (29-Aug-2014)
  532. e2fsck: Invalid argument while trying to open /dev/root_vg/root
  533.  
  534. The superblock could not be read or does not describe a valid ext2/ext3/ext4
  535. filesystem. If the device is valid and it really contains an ext2/ext3/ext4
  536. filesystem (and not swap or ufs or something else), then the superblock
  537. is corrupt, and you might try running e2fsck with an alternate superblock:
  538. e2fsck -b 8193 <device>
  539. or
  540. e2fsck -b 32768 <device>
  541.  
  542. root@ubuntu:~# e2fsck -b 32768 /dev/root_vg/root
  543. e2fsck 1.42.12 (29-Aug-2014)
  544. e2fsck: Invalid argument while trying to open /dev/root_vg/root
  545.  
  546. The superblock could not be read or does not describe a valid ext2/ext3/ext4
  547. filesystem. If the device is valid and it really contains an ext2/ext3/ext4
  548. filesystem (and not swap or ufs or something else), then the superblock
  549. is corrupt, and you might try running e2fsck with an alternate superblock:
  550. e2fsck -b 8193 <device>
  551. or
  552. e2fsck -b 32768 <device>
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