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Questions tagged [ext4]

The ext4 or fourth extended filesystem is a journaling file system for linux/*nix developed as the successor to ext3.

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resize2fs -M doesn't remove all (most) free blocks

I'm trying to create a smaller version of a Rasbian OS Lite image. I have tried to run resize2fs -M /dev/sda2 on the SD card root partition. But as you can see below, after resize2fs there is still a huge number of free blocks. Mounting it you can…
maloo
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Discover EXT4 (or other) Linux file system (e.g. bootable?)

I want to be able to identify whether some older SATA HDD's have Linux partitions. With the advent (and my fairly recent discovery) of Windows Subsystem for Linux (WSL) on Windows, I realize options have been improved, but i'm not sure it helps with…
J S
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How to recover file system (ext4) on raid5?

I have an ext4 file system on a raid5 array, /dev/md0 built from mdadm. I found it wasn't mounted after I reboot once. And I ran a fcsk on it but get a superblock error. So I was going to run mke2fs -n /dev/md0 to get the information of backup…
Programus
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Upgrade to KeyCloak 18 fails

I have a KeyCloak 17.0.1 that is apparently working without issues on my server, configured to use MariaDB. I say "apparently" because, as of today, it's not in production yet, albeit it starts in production mode, but it is on a development server…
Lucio Crusca
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Wrong ext4 filesystem free space

We have a linux server with LVM. Looking the space availability with df -h the difference between filesystem size and used space is not zero but the available space is zero. This is the output of the df -h Filesystem Size Used Avail Use%…
combas
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mkfs.ext4 -m -T options

How can I find out if I formatted the drive with mkfs.ext4 -m 0 -T largefile4 or without specifying the options -m and -T mkfs.ext4 In other words how can I see what is the -m reserved-blocks-percentage and -T usage-type of a formatted drive?
ThomasHunter
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Ways to debug root partition not unmounted on reboot

I have a problem where every time I reboot a Linux system (Ubuntu-based), the root filesystem is not unmounted successfully. Doing a fsck after a reboot results in output like: Recovering journal [...] clearing orphaned inode [...] The message…
Andrey W.
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Recovering a file by mounting a Synology RAID1 disk in Ubuntu (mount, mdadm, and losetup issues)

I'm working with a Synology RAID1 system and deleted a file that wasn't yet backed up. To recover the file, and since an undelete approach seems to be impossible, my idea is to mount a single RAID1 disk in Ubuntu 20.04 LTS and search for it, but I'm…
jay.sf
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mkfs + any solution for “could not read block” or disk replacing

we doing mkfs on the disk sda as the following mkfs.ext4 -j -m 0 /dev/sda -F mke2fs 1.42.9 (28-Dec-2013) Warning: could not erase sector 2: Attempt to write block to filesystem resulted in short write Filesystem label= OS type: Linux Block…
King David
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directory listing hangs after directory was flooded with > 5 million files

A misconfigured logrotate produced a lot of files in a directory on my server. ls | wc -l showed 5,387,172 files and according to du -sh this summed up to about 8 GB. dmesg showed many errors like this: [16718682.749947] EXT4-fs warning (device…
yankee
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between ex4 and XFS which is better for large small files

Between EXT4 and XFS which file system is better when an application uses multiple threads to read/write large amount of small files on a SSD. From what I read In general, Ext3 or Ext4 is better if an application uses a single read/write thread and…
kumar
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What is the purpose of having a "/" and a "/home" partition in linux?

I'm doing a clean install of CentOS 8 minimal, and by default it suggests these paritions: swap swap 4G /boot ext3 512M / ext4 2014G /home ext4 all (this is with a pair of 4TB NVMe drives in software RAID 1) I understand the need/benefit of…
Codemonkey
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weird filesystem behavior (corruption?)

Something very weird I came across, any thoughts would be much appreciated: Some software (httrack) created a directory structure. Using my user (which also ran the software), I cannot view the directory: ls -ltra feed/ ls: cannot access 'feed/.':…
Joris
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Monitor Linux Server filesystem health and suspicious activities

I run my own, small server here. The server runs on Ubuntu 18.04. There is one single HDD using LVM on a partition together with EXT4. LVM is used for taking snapshots. I also use Webmin with Virtualmin for administration. During the past weeks, I…
C. Hediger
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mdadm RAID 10 filesystem corruption -- recoverable?

PROBLEM: I had a degraded disk in my RAID 10 array which I created using mdadm. I first removed the disk, replaced it with a new one, but when I rebuilt, I got an error saying it couldn't detect the file system of the disk. I realized with fdisk…
user3787902
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