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

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Can I unformat an NTFS volume that was formatted as ext4?

No data was written to it. Is there a tool that will allow me to do it? I would prefer a free tool, but please recommend non-free if only such software can do the job.
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Ubuntu 10.04 with ext4 gets repeated IO errors

we installed a new DELL server with the (not supported) Ubuntu 10.04 LTS. We configured a hardware RAID (I think RAID 1) with the DELL tools before installing Ubuntu. The server is not under load at ...
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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 ...
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changing filesystem format from xfs to ext4 without losing data

I have a fresh Lucid Lynx (Ubuntu 10.04) running on a laptop. where I defined the filesystems as: mount point / on ext4 (46 Gb) mount point /home on jfs (63 GB) swap as 3 Gb I left the machine ...
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Where to get comprehensive list of tune2fs/tune4fs options per filesystem?

tune4fs can use many undocumented (I mean they are not yet in man tune4fs) options for ext4 filesystem. For example, huge_file, flex_bg, dir_nlink, extra_isize and some others. Is there a ...
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Linux: Why change inode size?

Tune2fs allows to change inode size from default (128 bytes on ext3, 256 bytes on ext4) to almost anything, but it should be power of two. What are the reasons for changing default inode size? Here ...
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CentOS 5.5 ext4 conversion problem - ext4 partition is recognized as ext3

I had 5.4 machine. Upgraded to 5.5 today via yum upgrade. All went fine. Rebooted. Wanted to convert root partition to ext4 (I have three partitions: /boot, / and swap). All of them on software RAID 1 ...
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Running resize2fs on /

I'm trying to resize an ext4 filesystem on a Fedora 11 box. Using fsdisk and lvm, I was able to grow the partition and logical volume containing the filesystem. When I try to run resize2fs on the ...
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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 ...
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Best way to 'harden' embedded ext4 file server against unexpected loss of power?

First, a little background: my company makes an audio streaming device that is a headless, rack-mounted Linux box with a Solid State e-SATA drive attached. The drive is formatted with ext4. The ...
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What are the merits of ext3 over ext4?

Specifically want to use the storage for music/video files but with a smattering of usual doc/xls/etc) - wondering if there is a concrete reason to go for one over the other. Thanks
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Which “features” of ext4 existing ext4 partition uses?

When I create ext4 filesystem, there are many "features", which I can enable and disable - like has_journal, extent, huge_file and so on. Is there any way to know, which options were used while ...
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ext4 in debian 5 (2.6.26)

Is ext4 ready for production usage in debian 5 (with linux kernel version 2.6.26) ? Will it be stable, oops-free and bug-free?
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What is the maximum number of files a file system can contain?

Given the current structure of a directory entry on a ext4 file system on Ubuntu, what is the maximum number of files a file system can contain? What is the general method of calculating the maximum ...
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Restoring a smaller partition image to larger partition using dd

I recently backed up an 11GB ext4 partition to a file using dd, repartitioned, and restored the file to a 40GB partition. parted now shows the partition as 40GB, Nautilus reads it as 11GB, and both ...
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Ext4 Sub directory scalability

According to http://ext4.wiki.kernel.org/index.php/Ext4%5FHowto says: Right now the maximum possible number of sub directories contained in a single directory in Ext3 is 32000. Ext4 breaks that ...
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Why should I switch to ext4 when upgrading to Ubuntu 9.10?

I'm going to upgrade from Ubuntu 9.04 to Ubuntu 9.10 in a near future and wanted to know if I should migrate my existing ext3 partitions to ext4 during the process and, if yes, why?
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Best filesystem for storing photos on Linux [closed]

I have 200+G of photos I usually keep on my main computer so that they are always available. File sizes range from 2-3MB JPGs to 10-12MB RAW files. I thought the nice old ext3 could be abandoned in ...
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How to diagnose erratic disk behavior?

I have a web site with users lighttpd and CGI scripts. After upgrading to Fedora 11 (ext4) the disc access became erratic. The timing of python -c 'import cgi' varies between 0.1 to almost 10 ...
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Filesystem for an external drive that'll only connect to Linux

I just bought a new 500GB external harddrive. Most of the time I only store operating system ISO's on those things and some movies. Large files anyway, well over 4GiB sometimes, so FAT is out of the ...
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Slow ext4 fsck

Why fsck is so slow on ext4 filesystem? I was always using reiserfs or xfs and with those systems fsck was really fast, just few seconds. Now i decided to give a try ext4 but i'm dissapointed that ...
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What are the differences between ext3, ext4 , ReiserFS?

And why should I pick one instead of the other?
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Is the F.U.D. about ext4 justified? Or would it be safe to use in some production systems?

I am wondering if ext4 is safe to use on my servers. But I've heard so much FUD about it that I am concerned. Our system could lose some data, and it would not be too big a deal. Even a full days ...