ext4 (fourth extended filesystem) is a journalling file system for Linux, developed as the successor to ext3. Use this tag for question that are ext4 specific, generic file system related questions should use tag [filesystem]

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Risks involved with lazy_itable_init=1 for ext4 fs on SD card

My setup is the following: Linux kernel 2.6.28 e2fsprogs 1.42.7 64 GB class 10 SD card I am attempting to speed up the time it takes to format the entire card to an ext4 filesystem. My research ...
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Extremely long time for an ext4 fsck

The problem that I am having is the extremely long time that fsck is taking. I have thoroughly made searches on Google, but I could not find anything that would resolve the problem. The command that ...
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What is the “cost” of deeply nested folders in ext4?

I was running into performance problems with hundredthousands of files in single directories when I needed to do certain wildcard matches. From my applications point of view, a simple solution is to ...
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ext4: where did my free space go?

I just upgraded my Mageia 2 64bits VM to Mageia 3, and now my virtual disk free space is almost nil, even though less than 100% of the space is used. I am not an ext4 filesystem expert but I have ...
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Safest way to run ext4 fsck on external drive

I have an external drive formatted in ext4 that throws this error message when is plugged in EXT4-fs (sdd2): error count: 8 initial error at 1366215273 last error at 1366215527,it generally works just ...
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Drawbacks of increasing number of inodes in EXT4

I am currently using backintime to take "snapshots" of my file system. It is similar to rsnapshot in that it, makes hard links to unchanged files. I have recently run out of inodes on my EXT4 ...
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What does the command “chattr +c /some/dir/” do?

I'm trying to keep a bunch of plain text files compressed using the extended attribute option - c on a debian ppc64 system. I ran the following commands: # mkfs.ext4 /dev/test/compressed # mount /dev/...
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How can I mount filesystems with > 4KB block sizes?

I have a 3TB hard disk pulled out of a WD Mybook Live NAS. The partition table is as follows: Model: ATA WDC WD30EZRS-11J (scsi) Disk /dev/sdb: 3001GB Sector size (logical/physical): 512B/4096B ...
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Convert old /home from ext3 to ext4

I have an old /home partition, that dates back to former linux systems, and it is still in ext3 format. Whereas the rest of my system, / and some other mounted point are devices formated in ext4. I ...
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Encrypted disk filesystem compatibilities

On my Debian Linux system during the install I decided to use disk encryption (the one offered during a regulard Debian install). When the system boots up I need to enter a password and then the "...
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Can the same ext4 disk be mounted from two hosts, one readonly?

I know that mounting the same disk with an ext4 filesystem from two different servers (it's an iSCSI vloume) will likely corrupt data on the disk. My question is will it make any difference if one of ...
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How can I delete data from in a hexdump file from one offset to another?

I've created a disk image which was zeroed, formatted to ext4 file system, and then had several various files copied to it. I'm trying to extract these files using a combination of xxd and dd, but ...
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Is it possible to disable file permissions on a ext3 or ext4 file-system?

Is it possible to disable file permissions on an ext3/4 file-system? Just wondering if it's possible to completely disable or ignore file permissions on a ext3 or ext4 file system. Perhaps a mounting ...
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Should a laptop user switch from ext4 to btrfs?

Related to this. I'd like to take advantage of an OS switch to upgrade to BTRFS. BTRFS claims to offer a lot (data-loss resiliency, self-healing if RAID, checksumming of metadata and data, ...
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3answers
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Recovering an ext4 filesystem with corrupt journal

I have a hard drive that seems to have developed some kind of hardware problem in the journal. This prevents the drive from being loaded. Running mount -r -t ext4 /dev/sda5 /mnt/root results in the ...
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1answer
496 views

How to put syslinux on an sd card

I would like to know how to put syslinux on my sd card and I have tried using extlinux. However, I keep getting the message Missing Operating System. Please help me.
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How to write isolinux to an ext4 filesystem

How would I write isolinux to an ext4 filesystem on an 1 GB SD card so that it would boot at startup?
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Constant reading using ext4

I had a disk with a full size NTFS partition. I just deleted it and created an EXT4 one. When it was NTFS, if it wasn't in use (mount but no in use) it was quiet. However now, using EXT4, it is ...
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How do I know if a partition is ext2, ext3, or ext4?

I just formatted stuff. One disk I format as ext2. The other I want to format as ext4. I want to test how they perform. Now, how do I know the kind of file system in a partition?
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extundelete does not finish its work

I need to restore a file on sda7 so I remounted ro und startet extundelete manuel@P5KC:~/recovery/RECOVERED_FILES$ sudo extundelete --restore-all /dev/sda7 WARNING: Extended attributes are not ...
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1answer
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Why could the size of the “dot” file “.” exceed 4096?

Today I found an "empty" directory with a size of 4MB. It had no visible contents, so I tried ls -lah. This showed me some hidden files (not very large). Searching for the reason why the directory ...
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1answer
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Why is some filesystem space used even though the filesystem is empty? [duplicate]

Possible Duplicate: ext4: How to account for the filesystem space? After googleing a little I find that ext4 reserve 5% for root: Reserved space for root on a filesystem - why?, ext2/3/4 ...
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Why ext4 File System is better than NTFS? [closed]

For a presentation, I need to show ext4 File System is better than NTFS. I searched and got nice article on both ext4 and NTFS http://en.wikipedia.org/wiki/Ext4 http://en.wikipedia.org/wiki/NTFS ...
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Extended partition should have many filesystems

I need some related information on the following lines I found in an answer: A logical partition is a container for a filesystem (or an LVM volume or some swap space or a BSD partition or other ...
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How do I choose between ext 3 and 4?

I tried looking at the difference, the main ones seem to be 4 supports more subdirectories in a file, supports larger files, has delayed write which I don't prefer as I don't want data loss. I also ...
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Resize non-LVM ext4 root partition

How can I shrink/resize a non-LVM ext4 root partition? The problem is I can't unmount it and I don't have physical access.
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Why does dd change the filesystem on the external disk?

I took out a 250 GB SATA disk from my netbook, filled it with zeroes with dd and connected it to my laptop via the usb adapter. It's correctly detected by fdisk: Disk /dev/sdb: 250.1 GB, 250059350016 ...
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What are EXT4 Security Labels?

During Gentoo installation of Gnome keyring, I am told to switch on EXT4 Security Labels, which is described in the kernel documentation by: Security labels support alternative access control ...
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What is a generic way of finding out whether the kernel has ext4 (or other) bugs?

From /. found this worrisome post by Theodore Ts'o. Turns out ext4 has some journalling problems. How can I quickly find out version numbers of susceptible kernels for this and other bugs?
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Fastest way to get list of all file sizes

I'm trying to create a graph of the distribution of file sizes on my ext4 system. I'm trying to write a script to scrape this information from my computer somehow. I don't care where the files are ...
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how to restore a logical partition to its original ext4 format

This question is following Unable to mount /home/ partition after reinstalling grub after reinstalling windows 7 where the diagnostic was that installing windows 7 deleted my /home partition, lovingly ...
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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 ...
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Birth is empty on ext4

I was just reading up on the Birth section of stat and it appears ext4 should support it, but even a file I just created leaves it empty. ~ % touch test ...
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A lot of errors on ext4, however smart doesn't show any errors

I have a Debian box with additional ( it is not a system disk ) 1.5Tb sata hdd (wd caviar green). There is only one partition on the whole disk. Disk is used for backups from remote system (with ...
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1answer
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How to fix a fragmented ext disk - myth or truth?

I just read this article about the virtually non-existent disk fragmentation on *nix filesystems. It was mentioned that due to the way ext handles writing data to the disks, fragmentation may only ...
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corrupted library after hard shutdown

yesterday night my laptop executes a hard shutdown because my battery was out of charge. After the reboot Xorg hangs and the troubleshooting was pretty hard. A first file system check of my ext4 ...
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recovering ext4 partition after dd'ing over start of HD

I accidentally used dd and wrote over the first 208MB of my external disk. What I wrote over is a partition on its own (Debian nestinstaller) so what I see now is not my old (now damaged) ext4 ...
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Howto configure autofs to work with usbsticks formatted with differend filesystems

I have some USB-sticks using fat32 as filesystem and others using ext4. Now I want to configure autofs to mount the sticks automatically. To make sure that the user can write to fat32 sticks I use ...
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Recreating EXT4 partition without losing data [duplicate]

Possible Duplicate: Can't mount EXT4 hard drive after mounting it in windows I have a 2TB Western External USB harddisk. I formatted it to EXT4. one time I plugged it to a windows machine ...
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2answers
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Is it possible to change Inode count on an ext4 filesystem? [duplicate]

Possible Duplicate: How can I increase the number of inodes in an ext4 filesystem? I have a homemade NAS with Debian Wheezy 64bit. It has three disks - 2x2TB and 1.5TB, pooled together using ...
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No access to symlink folder on NTFS partition

I am using an NTFS parition for storing data I like to access both from Ubuntu and Windows 7. On my Ubuntu HOME partition, I like to link the folder Assets in order to access it from an application ...
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1answer
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Why my partitions don't show the right capacity on a 4096 byte physical block hard drive?

After reading a lot about why newer 4096 byte physical block hard drives should be partitioned taking care of alignment (Linux on 4KB-sector disks: Practical advice, What is partition alignment and ...
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File system jfs/btrfs/xfs/ext4 [closed]

I was looking into some of the requirement, where huge amount of recursive files are written and deleted and looking forward if any FS (file system) as such gives advantage on others. I am trying to ...
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1answer
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ext4 directory lists as a file

I'm working with a large (8TB) EXT4 filesystem in linux. After a power outage, the filesystem wouldn't mount. fsck is taking weeks to complete, but i ran testdisk and i'm able to see my partition ...
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2answers
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Can't mount EXT4 hard drive after mounting it in windows

I have a 2TB Western external HDD. Its original filesystem was NTFS but I formatted it to EXT4. I had no problem in Linux; But today after I mounted it using ext2fsd in a windows box, I cant mount it ...
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largefile feature at creating file-system

Is useful to use -T largefile flag at creating a file-system for a partition with big files like video, and audio in flac format? I tested the same partition with that flag and without it, and using ...
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1answer
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To use -c0 -i0 in file-systems with journal

I've several partitions with ext4. Now, I would want if it makes sense to use tune2fs with flags -c0 (max-mount-counts) and -i0 (interval-between-checks) in the partitions with a journal file-system ...
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How to limit ext4 filenames to only those filenames legal in FAT?

The ext4 filesystem allows some characters that FAT does not allow, such as :. This has caused me much grief in the past when trying to move files, especially as KDE will delete such files instead of ...
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1answer
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Ext4 support in Grub 0.9X (legacy) and Grub 1.9X (Grub2)

I'm about to setup my new USB key with Grub or Grub2. In the old days I used ext2 for the boot partition. I'm wondering if I could use ext4 for Grub2? And if use Grub 0.9X, what about support of ...
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ext2/3/4 reserved blocks percentage purpose [duplicate]

I know that this feature dates back 20 years but I still would like to find out What is the purpose of the reserved blocks in ext2/3/4 filesystems?