Unix and Linux Stack Exchange
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Questions tagged [superblock]

78 questions
64
votes
5 answers

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 partition and uses a GPT partition table (with the…
tlvince
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Btrfs super-recover says all superblocks are good but mount disagrees

I have an external drive formatted with BTRFS that seems refuses to mount: $ sudo mount -vs -t btrfs -o ro,recovery,errors=continue /dev/sdb2 /media/user/dir mount: /dev/sdb2: can't read superblock However, when BTRFS thinks that all the…
Livius
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Difference between backup superblocks

Recently I accidentally formatted an EXT4 partition to FAT. I got into a panic. After a long journey through a dark wood in which my hope was fading I could recover my partition and it seems ok. After sudo mke2fs -n /dev/sdx introduced some…
Dante
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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 Size Used Avail Use% Mounted…
slm
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How to fix if I received mount: /dev/vgname/lvname: can't read superblock for the local filesystem?

I received an incident when I was trying to do mount -a . I was getting the below error. So how to fix this issue? mount: /dev/vgname/lvname: can't read superblock
sagar hedaoo
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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 --raid-devices=2 /dev/sdb1 /dev/sdc1 in an…
bestephe
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3 answers

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 again. The common format — known as version 0.90 —…
ddeimeke
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ext4 - Bad magic number in super-block

ext4 is failed me again! the most unstable fs tried to fix it by restoring block from backup, but without luck.. ↪ sudo fsck.ext4 -v /dev/sdd e2fsck 1.45.6 (20-Mar-2020) ext2fs_open2: Bad magic number in super-block fsck.ext4: Superblock invalid,…
Yu Da Chi
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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 fsck MANNUALLY (i.e., without -a or -p…
user2914
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Can't load Ubuntu: Superblock checksum does not match superblock while trying to open /dev/sda7

I have a problem while loading into Ubuntu 17.04. This happens for the 2nd time after I booted into Windows. For the 1st time I just reinstalled the Ubuntu. I am not good at this question, so I hope to get a full list of steps to diagnose and…
kozlone
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Data recovery from 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 as is now. I believe the data is still there as…
Neovatar
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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 Table: N blocks Data Blocks: remaining blocks However…
goose999
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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 /dev/sda5". I have tried all the alternative…
thepeer
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List what each sd is

On Linux I know that sda, sdb, and sdh are hard drives, but I don't know what is sdc, sdd, sde, sdf and sdg are. Some of them are (I think) empty and some of them, the kernel tries to make them spinning without success Is there a command to know…
aaa
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Access ext4 disk that lost superblock and its backups

I found myself in a weird situation with my system's disk. It's Linux system with 3 partitions, boot, swap and filesystem (ext4). A few days ago i used knoppix from a pendrive (I made the bootable usb drive from a knoppix image myself) because i…
valepu
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