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Full Discussion: RAID5 multi disk failure
Top Forums UNIX for Advanced & Expert Users RAID5 multi disk failure Post 302593593 by chebarbudo on Friday 27th of January 2012 12:37:45 PM
Old 01-27-2012
Hi there, me again,

I think my problem is somewhere else.
I know no disk is broken given that there are a few other raid arrays using the same 4 disks:
Code:
root@titan:~# cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] [multipath] [faulty]
md1 : active raid1 sda1[0] sdd1[3] sdb1[1] sdc1[2]
      1024896 blocks [4/4] [UUUU]

md5 : active raid1 sda5[0] sdd5[3] sdb5[1] sdc5[2]
      1023872 blocks [4/4] [UUUU]

md6 : active raid1 sdc6[2] sda6[0] sdd6[3] sdb6[1]
      1023872 blocks [4/4] [UUUU]

md7 : active raid1 sda7[0] sdd7[3] sdb7[1] sdc7[2]
      1023872 blocks [4/4] [UUUU]

md8 : active raid1 sda8[0] sdd8[3] sdb8[1] sdc8[2]
      1023872 blocks [4/4] [UUUU]

unused devices: <none>

So I thought I should just check the disks.
Problem: fsck doesn't work:
Code:
root@titan:~# fsck.ext3 /dev/sdc10
#e2fsck 1.41.3 (12-Oct-2008)
fsck.ext3: Superblock invalid, trying backup blocks...
fsck.ext3: Bad magic number in super-block while trying to open /dev/sdc10

The superblock could not be read or does not describe a correct ext2
filesystem.  If the device is valid and it really contains an ext2
filesystem (and not swap or ufs or something else), then the superblock
is corrupt, and you might try running e2fsck with an alternate superblock:
    e2fsck -b 8193 <device>

root@titan:~# fsck.ext3 -b 8193 /dev/sdc10
e2fsck 1.41.3 (12-Oct-2008)
fsck.ext3: Bad magic number in super-block while trying to open /dev/sdc10

The superblock could not be read or does not describe a correct ext2
filesystem.  If the device is valid and it really contains an ext2
filesystem (and not swap or ufs or something else), then the superblock
is corrupt, and you might try running e2fsck with an alternate superblock:
    e2fsck -b 8193 <device>

How can I repair the filesystem on /dev/sdc10?

Thanks for your help
Santiago
 

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FDISK(8)						      System Manager's Manual							  FDISK(8)

NAME
fdisk - partition a hard disk [IBM] SYNOPSIS
fdisk [-hm] [-sn] [file] OPTIONS
-h Number of disk heads is m -s Number of sectors per track is n EXAMPLES
fdisk /dev/hd0 # Examine disk partitions fdisk -h9 /dev/hd0 # Examine disk with 9 heads DESCRIPTION
When fdisk starts up, it reads in the partition table and displays it. It then presents a menu to allow the user to modify partitions, store the partition table on a file, or load it from a file. Partitions can be marked as MINIX, DOS or other, as well as active or not. Using fdisk is self-explanatory. However, be aware that repartitioning a disk will cause information on it to be lost. Rebooting the sys- tem immediately is mandatory after changing partition sizes and parameters. MINIX, XENIX, PC-IX, and MS-DOS all have different partition numbering schemes. Thus when using multiple systems on the same disk, be careful. Note that MINIX, unlike MS-DOS , cannot access the last sector in a partition with an odd number of sectors. The reason that odd partition sizes do not cause a problem with MS-DOS is that MS-DOS allocates disk space in units of 512-byte sectors, whereas MINIX uses 1K blocks. Fdisk has a variety of other features that can be seen by typing h. Fdisk normally knows the geometry of the device by asking the driver. You can use the -h and -s options to override the numbers found. SEE ALSO
part(8). FDISK(8)
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