The ext4 or fourth extended filesystem is a journaling file system for linux/*nix developed as the successor to ext3.
Questions tagged [ext4]
469 questions
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votes
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Is data=journal on a separate device on Ext4 as good as using a RAID controller with battery backed cache for file system consistency?
It seems to me that data=journal prevents file system inconsistency in the case of power failure. Using it with a dedicated journal device mitigates the performance penalty of writing the data twice. A power outage would still lose the data that is…
Jeff Strunk
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Files on ext4 on Drobo with corrupt, zero-ed out blocks
I have a 2TB ext4 file system (Ubuntu running Linux kernel 2.6.31-22-server x86_64). This file system is the second drive on a Drobo box plugged in via USB. We've not had problems on the first drive (Drobo limits drive size to 2TB due to some OS…
Patrick
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2 answers
ext4 fs breaking after power outages
I am experiencing quite a typical but strange problem: the hdd is going bust after power cuts on my server. I can feel it huge work done by fsck on startup after the crash, and then my subversion repository is losing months of work - it all sounds…
Michael Pliskin
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3 answers
Immutable hard links on ext3/4?
In my research on file versioning at the fs level, snapshotting, and related ideas, I took a look at hard-links and exactly what they are and how they behave. Using rsync you can get a pretty slick poor man's snapshotting system up and running on…
Dale Forester
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Why can I change the the reserved blocks on a read only mounted ext4 filesystem?
I would have expected an error, sorry FS is read-only, but it is possible. This is unexpected & counter intuitive is there a reason?
Linux files 5.11.0-27-generic #29~20.04.1-Ubuntu SMP Wed Aug 11 15:58:17 UTC 2021 x86_64 x86_64 x86_64…
lithium7
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e2fsck cleans a filesystem and then a few minutes later (after a lot of reads) there are errors
The filesystem is on an LVM RAID5. It appears to be working correctly:
$ sudo pvs
[sudo] password for jrwren:
PV VG Fmt Attr PSize PFree
/dev/sda2 datavg lvm2 a-- <7.28t 2.80t
/dev/sdb2 datavg lvm2 a-- <3.64t 0
…
jrwren
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What linux distro support Host Managed HDD by file system?
According to this Seagate presentation there are some ongoing (?) efforts targeted toward modification of ext4 file system introducing SMRFS -EXT4 - support of host managed hard drives. The goal is to provide layer that will hide specifics of ZAC…
Vlad
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Cheap/fast deduplication with hardlinks?
I've got shared hosting with a few thousand Wordpress installs and I've wanted for ages to have a nice way of removing all the duplicate files in a sensible and secure way.
I'm looking for better disk cache hit ratios and simpler backups.
I'm just…
Nick
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Interpreting resize2fs shrink progress (-p) "pass 2" output
The question: What is resize2fs's progress bar indicating during "pass 2" of an offline shrink operation on a large (8-28Tb) ext4 filesystem?
The details:
I've done ~5 resize2fs shrink operations using the -p ("progress") flag and I can't figure out…
adfaklsdjf
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votes
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Reason for EXT4 file system corruption of Hyper-V guest
We had our second corruption of an ext4 partition in a relatively short time and ext4 is supposedly very reliable. As this is a virtual machine and the host providing the resources saw no disk errors or power-loss or such, I want to rule out…
Olaf Mandel
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Linus/ext4/nvme crashes during high io
During mvn compilation, I have random crashes.
The problem seems related to high IO and in kern.log, I can see things like:
kernel: [158430.895045] nvme nvme1: controller is down; will reset: CSTS=0xffffffff, PCI_STATUS=0x10
kernel: [158430.951331]…
Brimstedt
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votes
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output of cat /proc/sys/fs/inode-nr vs df -i
What's the difference between the output of
cat /proc/sys/fs/inode-nr
and
df -i
Both are documented at returning the number of inodes in use, but they return apparently unrelated numbers.
$ df -i
Filesystem Inodes IUsed IFree IUse%…
puzzled
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votes
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Diagnosing missing logical volume
EDIT: the system boots off a 16 gigabyte USB key.
Apparently, at some point, the 'device name' (sorry if I'm using that term incorrectly) of the boot device changed.from /dev/sde to /dev/sdb to /dev/sdc
The oldest .vg files (from before I added the…
Ryan Germann
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votes
1 answer
Why is UUID missing after creating ext4 filesystem on RHEL7 ec2 instance
I'm using Ansible to configure a server. This server is running on AWS Ec2 and I'm attaching to it four EBS drives.
When I run my ansible playbook it will fail about 50% of the time. The failure is when I mount a path to a newly formatted drive.…
Levi
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1 answer
quotacheck: Cannot stat() given mountpoint –cugv: No such file or directory
I am trying to enable quotas on an ext4 partition of a Debian 9 VM.
The partition is mounted on /public with the usrquota,grpquota options. The machine has been rebooted.
Here is what happens:
root@deb9-fs ~# df -hT /public/
Filesystem Type …
stan
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