The ext4 or fourth extended filesystem is a journaling file system for Linux, developed as the successor to ext3.

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Linux fine tuning for Vertex 3 SSD

I've been reading about optimizations for SSD disks on Linux, there is lots of info out there although very confusing and most feel outdated so I'd be grateful if someone sheds some light on the ...
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HDD bad sectors with OS [closed]

I wonder is that possible for OS to make bad sectors on Hard Drive? Preface: I have bought new HDD on 1Tb WB Caviar Black. I have installed new OS on ext4 partition Ubuntu 12.04.1 LTS. After few ...
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How can I mount an EXT4 USB drive on Windows 8?

I have a USB drive formatted as EXT4. How can I mount it in Windows 8? Ideas on other workarounds are appreciated as well!
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2answers
467 views

Why doesn't Ext4 cache directory size?

Once again I'm cleaning up my desktop because I'm running out of HDD space and everytime I call 'du -sh ~', it takes a really long time to calculate the current size of the directory. From my ...
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1answer
1k views

How to resize extended partition?

I have primary partition with Windows XP on it. Also I have extended partition divided into 3 logical partitions: - Drive D: for Windows - Ext4 Linux System - Swap Now, Linux is my main system, and ...
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from XEN to VMWare

I have migrated many xm virtual machine to vmware Using http://www.zoobey.com/index.php/resources/all-articles-list/268-xen-to-vmware , migrations were very smooth. But now I am struck in a xm ...
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What is EXT4-fs error (device md0): ext4_mb_generate_buddy:739: group 10770, 0 clusters in bitmap, 32768?

On my Ubuntu Server 12.04 I got this errors (via dmesg): [ 1104.544121] EXT4-fs error (device md0): ext4_mb_generate_buddy:739: group 10771, 0 clusters in bitmap, 32768 in gd [ 1104.549227] EXT4-fs ...
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Fastest way to convert an ext4 formatted disk to LVM with ext4 on it?

I'm currently doing cp -aR to copy data from my (99% full) 1TB ext4 formatted disk to a new LVM-with-ext4-on-it disk. It's taking forever. Is there any way to attempt to "convert" the disk in place? ...
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Parted has no 'resize' command available

I'm trying to resize a partition using parted, but it has no the 'resize' command available gchain@archbogchain@archbook:~$ sudo parted /dev/sdb GNU Parted 3.1 Using /dev/sdb Welcome to GNU Parted! ...
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1answer
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Reverse lookup of inode/file from offset in raw device on linux and ext3/4?

In linux, given an offset into a raw disk device, is it possible to map back to an partition + inode? For example, suppose I know that string "xyz" is contained at byte offset 1000000 on /dev/sda: ...
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Mounting a remote disk image which I made local via sshfs? Possible?

The core question first: Is sshfs fit to provide low-level reads/writes/seeks as required when a file contains blockdevice-like contents? Why? Well... I am trying to locally mount a filesystem-image, ...
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1k views

Slow rm performance on an ext4 partition

Removing what seems to me to be a moderate number of files takes a very long time. For example: $ pv linux-3.0.16.tar.bz2 | tar xj 73.2MB 0:00:16 [4.55MB/s] $ pv linux-3.0.16.tar.bz2 | tar xj 73.2MB ...
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190 views

Is file creation durable on ext4?

On some filesystems, when creating a file, it is necessary to call fsync() not only on the file itself, but also on the parent directory, to make the file creation durable. Otherwise, the directory ...
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How long can file system writes be cached with ext4?

A while ago, there has been some discussion about ext4 potentially leaving empty files after an unclean unmount, summed up pretty well in this article. Basically, because of delayed allocation, writes ...
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499 views

zram trimming by writing zero pages

I'm using ZRAM as a backing block device for /tmp filesystem in the following manner: echo 8000000000 > /sys/block/zram0/disksize mkfs.ext4 -O ...
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1answer
437 views

EXT4-fs error (device loop0) ext4_mb_generate_buddy

I've been randomly getting theses in my /var/log/messages [5747511.945300] EXT4-fs error (device loop0): ext4_mb_generate_buddy: EXT4-fs: group 1: 29505 blocks in bitmap, 29455 in gd Not had any ...
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593 views

western digital caviar black. EXT4-fs error

Recently I update my HDD on desktop machine, and bought WD Caviar Black. But after I format & copy information to it (using dd), and fix partitions size: I have next errors in kern.log: Aug 27 ...
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125 views

Quick way to empty a partition

I have a partition, formatted ext4, that I want to empty completely. I will be repeating this write-then-empty process repeatedly, so I want the emptying step to be as quick as possible. One option ...
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How to mount read-write an ext4 partition on Windows?

I want to use ext4 on my external HDD, but it must be cross-platform. (At least Linux, Win7 & WinXP). Unfortunately, I haven't found any proper driver allowing Windows to WRITE to ext4. I've ...
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754 views

On Linux allow a file to be read/write but not deleted

Is there a way in Linux on a ext4 file system that I can make a file readable and writeable but not deletable? The directory that the file resides in still needs to be writeable by the owner of the ...
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1answer
4k views

Is there a tool to browse files on a VMware virtual disk w/o starting a virtual machine?

I am looking for a way to browse through a VMware virtual disk in order to extract/copy files that are located on an Ubuntu EXT4 partition that is allocated on that disk, without the need to actually ...
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Having trouble with EXT4 on LVM on software RAID 5 (corruption)

Here's the quick and dirty of my problem. I'm using Lubuntu 12.04, Xubuntu 12.04 and plain Ubuntu 12.04. Tried with generic kernels 3.2.0-25 and 3.2.0-26. This issue persists on all 3 variants which ...
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88 views

Dealing with different usernames when mounting removable media in Linux

I have a laptop in which my username is, say, "foo". I have an external drive, formatted with Ext4, for which all files are owned by "foo" (at a filesystem level). Now, I have a desktop in which my ...
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Are there any reasons why I wouldn't want to format a USB flash drive in HFS+ for Linux/Mac usage?

There have been other questions regarding the use of HFS+ formatted drives on Linux (e.g. this); however, I am specifically interested in knowing if this is a good idea for a particular purpose. I ...
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858 views

How could I easily pack a directory to an ext4 loop partition image?

I would like to pack the content of a directory into an ext4 partition image easily, without mounting a loop device. Background: I am building a version of Android which will mount system partitions ...
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790 views

Hard drive partition size wrong. How do I resize without loss of data?

$ fsck fsck from util-linux 2.20.1 e2fsck 1.42 (29-Nov-2011) The filesystem size (according to the superblock) is 610471680 blocks The physical size of the device is 536870911 blocks Either the ...
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515 views

Cannot mount harddrive from HP ProBook via SATA-USB adapter

I'm trying to mount harddrive from HP ProBook 4525s to another computer for data backup from damaged laptop. There are two ext4 and one swap partition on hdd. I'm using SATA-USB adapter, but after I ...
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489 views

A weird issue relate to ext4/lvm/raid-5 after partition recovery

I have 3 hard disks, in the following paragraphs named /dev/sda, /dev/sdb and /dev/sdc, newest came first. Note: /dev/sdc has one primary partition /dev/sdc1, one extended partition /dev/sd2, and 3 ...
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How do I format a drive as EXT4 on Windows 7?

I'm trying to create an ext4 file system on an external drive. The partition manager I usually use, EASEUS Partition Master, doesn't support ext4. What are some free alternatives? Edit: It turns out ...
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Why are the sizes of 2 directories different if the data within the directories is identical? They are identical ext4 partitions and disks

root@phoenix:~# ls -ld /backups/external?/var/subsonic/thumbs/110 drwxr-xr-x 2 root root 73728 Mar 4 15:35 /backups/external3/var/subsonic/thumbs/110 drwxr-xr-x 2 root root 69632 Mar 4 15:35 ...
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367 views

Ext4 forensic analysis

I'm doing a thesis about forensic analysis and I'd like to format a disk with an ext4 file system without zeroing it, to analyze the possibility to recover deleted files. This is a problem, because ...
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219 views

parted killed my ext4 stuff

In parted you're supposed to be able to delete a partition, make a new one, and your data will still be there. It's gone. Nothing, not even testdisk is finding the partition. If I do the same stuff ...
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643 views

Booting an EXT4 image file from GRUB2

My friend needed a fast HDD so I gave her my small 64GB SDD. This SSD had my Linux install on it. I used dd to make an image of the partition (boot, root and home on one partition). This partition is ...
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Unable to repair an ext4 filesystem with bad superblock

Using the dd command, I was hoping that I would be able to copy over the first 446 bytes from Disk B (250GB) to Disk A (80GB), in order to make Disk A bootable just like Disk B. I issued the command: ...
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Drive system file size

When i made a new drive it take some space for system file FAT32 take the less space, then NTFS, then ext4 my question how to know the space will be taken for the system before make the drive, if the ...
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Mounting external usb harddisk (ext4) in virtual box in windows

I would like to mount my external linux formatted usb harddrive in a virtual machine. The host is windows 7. Unfortunately virtual box doesn't enumerate the external harddrive in the options menu of ...
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85 views

Is it possible to fork a symlink?

I have my configuration file (e.g. .zshrc) put into an encfs container. When I log into the system the container is not yet mounted, hence the the symlink is dangling then. Is there a way to let the ...
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how to convert NTFS to ext4 in windows?

I want to convert one partition of my windows which is NTFS (or can be FAT32) to a linux file system partitioning? I'm looking for some tools or ways to do it for me!
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linux change ext4 block size to 8192 now can't mount it

I've done that: mkfs.ext4 -j -b 8192 /dev/sda3 Now I'm trying to mount it with: sudo mount -t ext4 /dev/sda3 foo But I'm getting this error: mount: wrong fs type, bad option, bad superblock on ...
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647 views

using setfacl to give access to another user without giving access to a group

I have a user that I use for backup, and I use setfacl to give that user access to files. However, setfacl changes the base ACL entry for group and some applications require that the base ACL entry ...
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How can I get access to EXT2, EX3 and EXT4 partitions on Windows 7?

I tried all programs recommended to mount Linux partitions like EXT2 or EXT3 or even EXT4 but no one can do well on Windows 7 32 bit. I want to access read-write, is there a program that can do this? ...
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394 views

Recovering ext4 data after accidental partial re-image?

I had a CD that automatically starts to image a system with windows XP/NTFS. Accidentally booted from it on a Linux system which has one large ext4 partition (500GB). Interrupted the imaging process ...
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Linux file system for a big file server

I would like to know, from more experienced people, what would be the best choice of file system to use for a file server having more than 20TB of hard disks. Personally I always used EXT3 (back in ...
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Kernel log littered with re-mount attempts because of going to/from battery mode. How do i turn it off?

My boot times became a bit too much so i decided to take a look ad kernel log to see what might be causing the problem.. There i noticed repeating: 12/17/11 02:25:28 PM EXT4-fs (sda6) ...
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Data recovery after sudo rm -rf /* on ext4

I sent the following command to my friend: sudo rm -rf /* He launched it. Does someone know how to recover data after deleting from ext4 on Ubuntu 10.10?
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Strange file permissions on FAT32 under Ubuntu

On my machine (Lenovo ThinkPad w510, Ubuntu 10.10) I have (at least) two logical partitions: an ext4 partition to which Ubuntu is installed; a FAT32 partition (the bigger one) on which I store all ...
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Recovering data from two partitions, one NTFS, the other ext4

I have an external HD, and it had three partitions on it. One was a 4GB ext4 filesystem ,and two others 120GB NTFS and 120 GB ext4. I created an image on the 4GB using the Linux utility dd on Fedora ...
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SSD: NTFS vs EXT4

Always when I read about SSD usage under Linux, the advice is to disable journalling in Ext4 (or use Ext2), since it's too bad for your SSD. But in all articles about SSD tweaks for Windows, I never ...
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626 views

Does stat/lstat on nonexistent file cause a disk seek?

When searching for a library file from a right folder, my application currently does couple of lstat's for the possible locationslocations. Now I'm wondering whether these lstat's (application is ...
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sharing an ext3/ext4 partition on external drive

is there a way of sharing an ext3/ext4 formatted partition on an external USB drive between different users (uids) on different Linux machines without creating a group for this purpose, setting the ...