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

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Formatting and Partitioning SSD Help?

So I just installed Ubuntu 14.04 LTS on my netbook and was going through the things to do to optimize my SSD (https://sites.google.com/site/easylinuxtipsproject/ssd) Steps 5 and 6 tell me to partition ...
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1answer
9 views

Retrieve data from a FreeSpace volume [previously ext4 volume]

Morning, Afternoon, Evening, any thing you wish. I'm using an HP-ProBook 4540S 750 Gb HDD 4 Gb of memory Intel Core i3-3110M CPU 2.40GHz x 4 I'm a software developper,so I use to install 2 Ubuntu ...
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1answer
18 views

Copying files to external HD formatted to ext4

I have bought an external HD, transcend 2TB 2.5 and formatted it from FAT32 to ext4 since I work most of the time with ubuntu. Now when I want to copy files from my computer to the device I get the ...
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0answers
7 views

How to roll back failed gparted ext4 partition growth

I had a 12TB ext4 partition which I wanted to extend to 18TB. I've added the new disks to the RAID and after doing that I wanted to re-size the partition to occupy this new space. I started the growth ...
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3answers
26 views

Why do ext2 and successors not need defragmentation?

The ext2/ext3/ext4 filesystem family does not need defragmentation. What underlying design help this filesystem in not getting fragmented?
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37 views

orphaned inodes on root file system (ext4); persistent problem

On my trusty systems (VMs under vmWare, desktops, and laptops), we have the following issue. The root file system seems to have inodes that are never marked as "free". After a month of a working ...
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17 views

EXT4 - jbd2/dm-1-8 - lazy initialization

I am running an operation that requires a lot of disk IO. It was going extremely quickly on my 500GB SSD until jbd2/dm-1-8 appeared in my iotop and is now permanently at 95-99%. From reading online, ...
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0answers
23 views

Is ext4 position independent and movable?

Does the data in an ext4 filesystem refer to absolute positions on the disk, or is it all relative to the start of the specific partition? I want to know this because I want to move an ext4 ...
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1answer
19 views

is source code for bash sufficient, when I want source code of ext4?

when I want to know the source code of ext4-filesystem (mkfs.ext4) - is it then sufficient to download the source code for bash ? - or do I need else source-codes after I did : sudo apt-get ...
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2answers
6k views

df reports an ext4 partition is full, but there is no data

I recently received a warning, that my home-partition is full. It is an Ext4-Partition mounted on /home, /dev/sda is a 240 GB SSD: hannes@XFLR6 ~> df -h Filesystem Size Used Avail Use% ...
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1answer
313 views

Lost extended partition after installing windows

I was using Ubuntu 13.04 and the hard disk was partitioned as follows: Primary Ext4 (250GB) Linux Extended (250GB) and Ext3 or Ext4 logical partition Linux Swap (4GB) I have installed Windows 7, ...
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1answer
66 views

Is there anything that ext4. btrfs, or F2FS can do for a usb3.0 thumb drive that fat does not do? [closed]

I don't particularly care about cross platform. I have a thumb drive, and what to know if there is anything to gain from formatting it to ext4, btrfs, or f2fs. Thanks
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1answer
1k views

very high IOWait + extremely slow hdparm -tT

I have been running 12.04 on my Fujitsu Siemens Lifebook E751 for almost a year without any problems, and then several days ago I noticed a very high CPU IOwait that makes the system poorly responsive ...
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1answer
71 views

What is the best freeware app for Windows to mount EXT4 partitions (from a GPT 4TB Disk) as RW, safely without corrupting the EXT4 partition? [duplicate]

My Computer is set up as Dualboot Windows and Ubuntu. I have 1 OS drive, and 1 hard drive with a /backup partition (which has all my family photos and data) and it is ext4. Also note... it is EXT4, ...
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2answers
2k views

ext4 to btrfs conversion: how long can it take? space requirements?

I started btrfs-convert for my ext4 partitioned hdd. I did a fsck first which was fine. So since it is running over 4 hours now (1.) I wonder if it will ever finish ? I read multiple articles ...
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68 views

Synology file recovery using extundelete

It's never easy... build a Ubuntu machine for the expressed purpose of recovering deleted files or folders from a Synology NAS using extundelete. I took one of the RAID1 drives out of the Synology ...
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0answers
89 views

Xubuntu 14.04 Automount ext4 USB Stick as root

I recently formatted my new Sandisk USB Stick with linux from the default FAT32 to ext4. Unfortunatelly, when Thunar Automounts the stick, it is mounted as root and not as the current user, so if I ...
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1answer
35 views

fstrim does not work for ext4 as root

I have a SanDisk SSD P4 32GB and I use ext4. Ubuntu 14.04. I read that I should execute the trim command from time to time, however, this command doesn't work on my machine: # LANGUAGE=en_US:en ...
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2answers
144 views

ext4 File System got damaged due to improper write

This is what happened, I inserted my (important) external HDD into a RedHat 6 machine, did my task's, unmounted the drive via Nautilus, and physically detached the drive from the machine (and now I ...
2
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1answer
44 views

How can I allow anyone to read/write files on a USB stick?

I've got a USB stick which is only used on Ubuntu machines, so is formatted ext4. The users on my machines have various user IDs, which means that a file created by a user on one won't necessarily be ...
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1answer
57 views

ext4 data recovery from gparted error

There is a number of other questions on this topic, however majority concerns formatted partitions or drive failure. In my case: During resizing and moving 2.7TB partition in Gparted, I encountered ...
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2answers
86 views

why is ext3 being used as disk format for most of linux and ubuntu and not other file systems [closed]

Can anyone explain why is ext4, ext3 or ext2 disk formats that have been used in Ubuntu as default and not others. Are there any advantages or disadvantages over other? If so, what?
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1answer
231 views

Why is btrfs slower than ext4, and why would I want to use it in an ubuntu install? [closed]

At this time (August 2014); having been following the benchmarks for btrfs on Phoronix,(http://www.phoronix.com/scan.php?page=home) and have been seeing on the aggregate; slower performance than ext4; ...
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1answer
46 views

Suspending with root on USB

I have a laptop running Ubuntu 14.04 from a root file system on USB storage. This is not working well, because after wake up from suspend, ext4 will frequently try to write to the root file system ...
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3answers
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undelete files on ext4

My mother has placed some important files on her /tmp per accident. Now, of course, they are gone. This happened yesterday (2 boots of the machine since) I want to try to undelete the files. They ...
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3answers
3k views

Partition Scheme Questions in Dual Boot Ubuntu/Windows installation

I just got a new laptop with Windows 8 and I am ready to install Ubuntu. I see the hard drive already has quite a few partitions, most of which seem related to Windows recovery. See capture: I am ...
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3answers
4k views

rsync not working between NTFS/FAT and EXT

I have music that I play in my car, from an FAT32 USB stick. The folder which I use to put songs on is stored on my EXT4 hard drive. I add/remove/retag songs regularly and occassionally want to ...
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0answers
321 views

Permissions to access an encrypted external HDD

I have an external HDD which has an encrypted ext4 filesystem. When I plug it into one of my laptops and provide the encryption password, I get this popup box saying: You do not have permissions ...
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3answers
2k views

Why do I get more free space than ext4 after formatting in XFS?

I've bought a 1TB external hard drive and after formatting the entire drive in ext4 Nautilus says there are 934.3 GB of free space. I've also tested formatting the drive in XFS, and in this case ...
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1answer
26 views

How to extend EXT Partition of Ubuntu

I've Dual booted Ubuntu in PC by shrinking the C: drive actual size of c: drive ntfs is 100 GB and Ext partition is 15 Gb now I'm thinking to extend the size of EXT where Ubuntu is installed without ...
0
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1answer
76 views

Ext4 going wild

All of my main hard drive Barracuda 7200.12 SATA 6Gb/s 250GB ST3250312AS ( 2 years old ) going wild. It has started from 28 June 2014. Partitions sda1(root), sda5(home), sda7(var) caught this from ...
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How to modify the starting boundary of an ext4 partition?

There are 4 partitions on the disk. parted /dev/sda --script -- print ... 1 1049KB 50.0GB ... ext4 2 50GB 82GB ... linux-swap 3 82GB 100GB ... ext4 4 100GB 1000GB ... ext4 My goal is to ...
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1answer
13k views

How to check a mounted filesystem for errors in a reliable way

Following this question: Force fsck.ext4 on reboot, but really "forceful" Apparently the output of e2fsck -n is not reliable when you use it on a mounted filesystem, so its output should not be ...
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2answers
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How could I mount an ext4 partition and have write permission?

I've set the /etc/fstab file so that I can mount an ext4 partition on startup and I did it with the following options : rw, auto, nouser, exec, sync. The problem is that I can't create or delete any ...
2
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1answer
1k views

File recovery after reformattig ext3/4 partition — extract old journal/superblock?

I seem to have reformatted my /home partition (previously ext4) as ext3 during an Ubuntu installation. It took me a couple of mounts to figure that out. Which, of course, is a bad thing. I've tried ...
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5answers
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Ext4 file system format dirve not shows in Windows 8

To install Ubuntu 13.04 formatted a drive with Ext4 file system format. After format it can't open the drive from windows 8 Os login. Whenever I try to open the drive following error shows : Thanks ...
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Arbitrary EXT4-fs remounts scattered throughout dmesg output

I've been trying to diagnose a message I see in my dmesg output. Last night I was watching a video which really taxed my notebook and I noticed that the computer was super hot and the fan wouldn't ...
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slow hard disk Ubunto 14.04 ext4 on thinkpad dual boot

Ext4 - is it slower? Have a Thinkpad with 8GB drive , 4 processors. Intel® Core™ i3-3110M CPU @ 2.40GHz × 4 . Ubuntu 14.04 LTS with updates applied. File reading is very slow. IDE STS hangs when a ...
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1answer
923 views

Can't automatically mount ext4 partitions under Ubuntu 14.04 (but can mount NTFS ones)

So I just got alongside my Windows 8.1 a cool Ubuntu 14.04 and quite happy with it (my default OS now). I just have a problem: the fact that I can't mount ext4 partitions at boot is quite annoying. I ...
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190 views

Bcache hangs on Ubuntu 14.04

I successfully setup my system to use bache in /home partition (200GB SSD partition as cache for 500 GB HDD partition). However, I keep receiving these messages: INFO: task bcache_writebac:222 ...
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1answer
133 views

How to remove has_journal feature on primary disk

I'm running a Ubuntu 14.04 LTS on a VMware virtual machine and I'd like to disable journaling feature on the primary disk. I did find this useful post but I can't use it because it says The ...
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2answers
1k views

Upgrade to Ubuntu 14.04LTS from 13.10 failed and now have a black screen

I tried to upgrade from Ubuntu 13.10 to 14.04LTS. In between it asked about some configuration files whether to keep or replace them, for all I chose to replace them on each prompt but at the end ...
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5answers
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Move ext4 partition

I have an ext4 partition at the end of an hard drive, and want to resize it to the full disk size (the rest of the disk is empty). It's not the root partition, just a data partition, so it's no ...
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shrink ext4 partition on raid 10

My question is similar to Move ext4 partition, but the challenge I couldn't figure out is how to shrink a partition from the start. So suppose originally the partition (with raid) is like this. ...
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Is my harddrive broken?

I've got a new 4TB drive. My old (2TB) drive was NTFS formatted. I formatted my new drive with a single 4TB partition to ext4. I've moved content of my old drive to the new drive to format my old ...
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bcache corruption after reboot

bcache seems to work fine, but after rebooting, the ext4 filesystem stored in /dev/bcache0 frequently, but not always, becomes corrupted - seemingly, it only damages metadata for recently modified ...
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1answer
23 views

When is disk fragmentation an issue and how does one fix it?

My ext4 drive recently filled up to 95 percent capacity before I cleared out space on my disk. While transferring files from my computer to an external hard drive, I noticed a lot of my oldest media ...
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35 views

Ext4 switching to read only mode

I have very frustrating problem. My server randomly switches / mount to read only without any pattern. Only message that I've found in logs is: htree_dirblock_to_tree:920: inode #14286877: block ...
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1answer
53 views

Linux partition system

While installing Ubuntu, I only created two partitions for Ubuntu one for swap and I formatted the other as ext4 and set mount point as "/". The Operating System is working flawlessly. I was just ...
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Unable to access ext4 partition, but can access Fat32 [duplicate]

I recently installed ubuntu on a new hard disk with several ext4 partitions and 1 fat32 partition for installing windows in the future. I am able to view all partitions in File Manager. The ...