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0answers
6 views

An existing mdadm RAID5 is not mounting, Either a problem drive or Superblock

I have 4 x 3TB NAS setup as RAID5 which has been working great for almost a year. After a recent abrupt shutdown (had to hit the power button) the RAID will no longer mount on boot up. I've run: ...
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1answer
77 views

Physical volumes, logical volumes, superblocks gone… how to boot?

A story fairly similar to this one happened to me yesterday. Update: My only hard drive /dev/sda was originally partitioned this way: Device Boot Start End Blocks Id System ...
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2answers
43 views

data recovery from form an accidental format on ext4 partition

When I was installing Mint Debian edition unlike the classic edition, the installation automatically formated my home partition when I did not specify to format. So the formatting previously was ext4 ...
1
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1answer
53 views

Creating disk device in a file

I'm trying to create disk device in a file with: dd if=/dev/zero of=file.img bs=516096 count=1000 sudo losetup /dev/loop0 file.img (echo n; echo p; echo 1; echo ""; echo ""; echo w;) | sudo fdisk -u ...
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2answers
85 views

mdadm metadata: should i take precautions to prevent superblock overwrite?

Situation: I'm creating a new RAID1 array using mdadm. I won't be using additional layers, such as LVM or dm-crypt. I've noticed that metadata version 1.2 is now the default. I understand it's the ...
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1answer
362 views

Ext2 block structure: size of reserved GDT Blocks

In every publication I found about ext2, the structure of a block group is defined as following: Super Block: 1 block Group Descriptor: N blocks Data Bitmap: 1 block Inode Bitmap: 1 block Inode ...
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1answer
123 views

e2fsck giving some error

I am playing with LVM and while doing lvreduce. I now get this error: [root@localhost raja]# e2fsck -f /dev/vg1/lvol2 e2fsck 1.41.12 (17-May-2010) e2fsck: Superblock invalid, trying backup blocks... ...
4
votes
1answer
600 views

How can I dump the contents of a filesystem's superblock?

I understand that I can list the location of a filesystem's superblocks using the following commands. Example First get the device handle for the current directory. $ df -h . Filesystem ...
2
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1answer
127 views

Relation between “Block Size”and “Upper Limits” in ext2

A similar looking question asks for the reason why the upper file limit could be 2 TB in ext2. I am trying to understand but the Documentation on ext2 but find this hard. Please correct me if I'm ...
1
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0answers
61 views

Superblock for /dev/sdb1 is wrong size: won't boot

I installed Red Hat as a VM and while it shows files for /dev/sda1 there are no files for /dev/sdb1. When booting I enter a recovery login and a statement that "the /dev/sdb1 Superblock can not be ...
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4answers
42k views

Recovering ext4 superblocks

Recently, my external hard drive enclosure failed (the hard drive itself powers up in another enclosure). However, as a result, it appears its EXT4 file system is corrupt. The drive has a single ...
2
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1answer
338 views

mdadm + lvm2: destroyed all superblocks accidentally

I accidentally overwrote all my RAID1 superblocks with garbage. I think this happened because I ALT-CTRL-DEL booted when the Ubuntu had put me in some kind of hard disk recovery mode. My display ...
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1answer
1k views

mdadm - Accidentally ran “mdadm --create” on an existing raid-1. The superblock is now corrupt and I am unable to recover data. Did I bork my data?

I have /dev/sdb1 and /dev/sdc2 that were previously setup into a RAID-1 with mdadm, but then I reinstalled and lost the old configuration. Out of idiocy, I ran sudo mdadm --create /dev/md0 --level=1 ...
4
votes
3answers
3k views

lost superblock in md raid

Issue on Red Hat Linux 5. Due to some miscommunication two LUNs in our environment were enlarged from 1.2 TB to 1.7 TB. Now, after a reboot, mdadm does not find the superblocks to build the array ...
2
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1answer
2k views

Unable to mount /home/ partition after reinstalling grub after reinstalling windows 7

I've reinstall windows 7 on it's asignated partition and, as usually, it override the MBR with it's own stuff and, thus, it was not possible to boot to my ubuntu 12.04 partition. I followed the step ...
2
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0answers
918 views

Superblock corruption on every boot

I have a Linux Mint 12 install on my laptop. Yesterday I powered it off like I always do and this morning when I started it I was greeted by an error screen. (Translated from Swedish) Fatal ...
4
votes
1answer
3k views

Recover a reiserfs hard disk

I'm unable to mount my 300GB external (in external enclosure) HDD's single partition. None of the fsck tools add anything, they cannot even recognize the partition. I had forgotten whether I had used ...
2
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1answer
1k views

All my superblocks are corrupt!

I am having a problem with my ubuntu ext3 filesystem. I can't boot from it or mount the volume when running live CD. When I try e2fsck I get: "Bad magic number in super-block while trying to open ...
4
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1answer
6k views

e2fsck: unable to set superblock flags on LogicalVolume

When I boot my machine either in normal mode or runlevel 1 it throws following error and I'm unable to boot the machine: checking filesystems /dev/MyGroup/LogVol00: UNEXPECTED INCONSISTENCY; RUN ...