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

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mounted filesystem without journal. Opts: (null) while mounting ext4 fs

I am using Beaglebone black with NFS, I have formatted internal eMMC with ext4 filesystem, when i mount the file system using following command message popups telling filesystem is mounted without ...
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14 views

Does btrfs-convert preserve the disk's UUID?

I'm thinking of converting my / from ext4 to btrfs. Will the UUID change?
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8 views

How can I get Samba to close files immediately?

I've been experiencing a baffling disappearing file issue on my NAS since I first bought it, and only today after extensive testing do I think I have a handle on what exactly is occurring. I fear ...
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2answers
300 views

e2image restore file system metadata

I'm trying to recreate file system metadata on a virtual disk. I can save this metadata using e2image, and the e2image man page tells me I can use e2image -I to restore the file system. Unfortunately, ...
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669 views

Partition went read-only, how to mount it again?

Every now and then the partition of my Linux installation goes read-only. Since the computer is a laptop, I suppose it's due to some writing error caused by some harsh movement. Partition was mounted ...
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3answers
3k views

Is there any way to restore EXT4 partition

Is there any way to restore ext4 partition after formatting the entire hard disk then making two partitions of NTFS
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243 views

Why I cannot format a microSD to ext4?

I have a Toshiba Class 10 64GB microSD that I want to use in a tablet (Cyanogenmod 11) by formatting it ext4. So I did the usual thing (under Fedora 20): created a single Linux partition with sfdisk, ...
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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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1answer
25 views

How to check that all files in a file system are can be read without errors?

I'm using an external hard drive with an ext4 file system to make backups. The backup software I use (faubackup) copies the file hierarchy 1:1 into a timestamp-named folder on the hard drive, and ...
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49 views

How can I identify and read only free-space junk data from EXT4 partition?

I have cloned an EXT4 partition via raw dd command from a Galaxy Nexus phone. How can I identify and read only free-space junk data from the EXT4 partition? I need to recover some WAVE samples(I'm ...
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2answers
2k views

Finding out the time a filesystem was last mounted

I want to find out the last time a filesystem was mounted on Linux (Debian). Any help?
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2answers
78 views

How to format to NTFS my EXT4 partition on Windows 8?

I'd like to format one of my partitions to NTFS which is EXT4 at the moment and an ubuntu is installed on, that I don't need anymore. I can't see the partition in My Computer and I've never tried ...
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2answers
35k views

Creating ext4 partition from console

I have a volume /dev/sda1 (1.2 TB) containing an NTFS partition using 0.6 TB space. I want to make an ext4 partition in the remaining 0.6 TB space. I have not tried anything yet because I don't want ...
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1answer
99 views

Unable to Create Files In Directory

There are lot of these kinds of questions on superuser, so I'll try and keep this quick by telling you what it's not: There is no application involved here. Just a user and a filesystem. I can login ...
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1answer
149 views

ext4 superblock backup locations are different from what is documented

When I format an ext4 filesystem the mkfs says: Superblock backups stored on blocks: 32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 4096000 My sparse_super flag is ...
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2answers
47 views

Accidentally formatted ext4 partition

I have just formatted an ext4 partition to fat32 using gparted. I stupidly closed gparted before I realized that I might have been able to use the undo function. I am currently attempting file ...
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5answers
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Stuck choosing between ext4 and ext3 for the file system

I was in the process of installing Ubuntu 11.10, but got stuck choosing which file system to use. ext3 and ext4; which is better for a personal desktop? If ext4 is better, will it work well on my ...
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168 views

ext4 fs not recommended for SSD's? Alternative FS [closed]

I read ext4 journalling fs is not good enough for SSD's by some anonymous posts. while phornoix review shows JFS, not a known FS for average Desktop user is considered best for SSD. I believe JFS is ...
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38 views

How to safely shred unlinked files on a Unix-based file system?

Scenario: After working with a confidential file (e.g. PDF a bank statement), you typed: rm my-confidential-file (or the famous Shift-Delete action in a GUI-based file browser such as nautilus) ...
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1answer
4k views

resize2fs seems stuck at pass 3 (scanning inode table) - what to do?

I have a machine running Arch Linux (2010, I believe) with a 6TB RAID-5 array hooked up to a Highpoint RocketRaid 2320. I've been having issues with the RAID controller's drivers and the latest Linux ...
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1answer
1k views

Free space not reclaimed after online resizing ext4 in Ubuntu 9.10

My root partition was filling up, with only 500 mbs left, I wanted to resize my root partition from 20 Gb to 40Gb So I resized my partition by using these steps: Using Gparted to resize another ...
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1answer
1k views

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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1answer
406 views

Linux shows several folders with the exact same name

I recently used a mac to copy several files and folders to a USB drive (ext4 through ExtFS), and now in Linux (Xbian) two folders in the root of the drive are shown four times. The output of "ls ...
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1answer
77 views

Recover LVM with software raid

I have a Synology NAS using SHR mode, which is basically LVM and Raid 5. Somehow my LVM volume became corrupted and won't mount anymore. This volume houses over 20TB of data, and most of it is NOT ...
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Convert ext4 hard drive to ntfs fromat without formatting

I have a 1TB external hard drive with about 800gb data of ext4 format. Is there a way of converting it to ntfs format without having to format hence losing my data?
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How many actual files were you able to store in a CentOS folder?

I found many questions about the total files limitations of the CentOS file-system, but I was curios in actual real-world situation, how many files people were able to store in one single CentOS ...
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356 views

How to copy files from one computer to another without losing any metadata?

Similar to but more demanding than this question : How to copy files while not modifying the file creation times at all? I want to copy files between computers without the "Modified" and "Created" ...
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1answer
109 views

Attributes of a file - followup for Windows and Linux

I found a question that lists the (quote): attributes are of a regular file (as opposed to a symbolic link, etc.) on Mac OS X with Mac OS Extended (Journaled) (HFS+) Does such a list exist for ...
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157 views

How to stop jbd2 to release a device

In an AWS EC2 instance, we have multiple EBS volumes. When I try to detach any of them, the umount command works, but the device can't be detached. # grep -c xvdj /proc/mounts 0 However, lsof ...
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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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1answer
101 views

How to shrink an ext4 partition from Windows?

My system has three primary partitions: two NTFS (one "system-reserved") for Windows 7 and one ext4 for Linux. How can I shrink the ext4 partition from Windows? I've tried the built-in Disk ...
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47 views

Is it possible to recover ext4 journal state before inode corruption?

First of all I'll describe my situation: I decided to make some partitions cleanup, resize, etc (not creating damn backup). Then I wanted to shrink filesystems, so I closed computer and booted some ...
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601 views

Forcing ext4lazyinit to finish its thing?

Is there any way to 'force' ext4lazyinit to finish the thing it does with maximum priority? Something like "I don't care about my system's ressources, just do your job as fast as you can"? I should ...
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Upgrade root (also boot) filesystem from ext3 to ext4 on Debian

After upgrading a Debian system from 5.0 to 6.0 (Lenny to Sqeeze), how do I go about upgrading the root filesystem (which in this case is also boot) from ext3 to ext4?
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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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2answers
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Linux: mount options to improve performance on slow HDDs?

I encounter a performance problem with two HDDs. One is fast but mounted remotely through NFS, the other is local (ext4) but slow. No, exchanging the two drives is not an option, because it would ...
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315 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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332 views

Restoring data from lost NTFS partition?

I had 3 NTFS partitions (C,D,E) on my old laptop running Vista. I wanted to install Ubuntu on the system partition C, i.e. over-write Vista, but keep D,E which were storage partitions. Stupid moron ...
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615 views

Segmerntation fault when running extundelete on Ubuntu - what to do?

I have a partition raw image on which I am trying to run extundelete to undelete some files from an ext4 filesystem. Unfortunately extundelete exits with a segmentation fault. Is there anything I can ...
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143 views

Someone please explain how I'm writing to EXT4 from Windows 8.1

I'm dual booting Debian amd-64 Wheezy 7.5 and Windows 8.1 I have 6 drives and I am 100% positive that four of the drives are formatted Ext4 (Formatted in Linux) How on earth is it that when I'm in ...
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How to read ext4 partitions on Windows?

Is there a way to read ext4 partitions from Windows? If so, what can I do?
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0answers
100 views

Ext4 allocation pattern with random writes in sparse file

If I create a large (a few GB) sparse file in ext4, and then write randomly throughout the length until all 4k blocks have been "touched", in the absence of other heavy write load, can I expect that ...
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0answers
159 views

How to run exe files on an ext4 partition using Paragon ExtFS under Windows 7

I've tried Paragon's ExtFS to mount an ext4 partition under Windows 7. I could open documents like PDF files without any problem, and creating and deleting files seems to work well, too (I've only ...
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Install e2fslibs 1.41

I have to use extundelete for my debian, but it requires e2fslibs 1.41. The command apt-get install e2fslibs-dev installs 1.42 version that is not compatible with it. How to downgrade? I'm usingh ...
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3answers
900 views

Pros and cons of ext4 for Ubuntu?

I've just converted another of my machine to Ubuntu. Should I consider using ext4?
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1answer
114 views

I accidentally formatted the wrong volume - is it possible to restore the previous Ext4 filesystem?

I know that a similar question has already been asked. This morning I accidentally formatted the wrong volume, containing mostly video files (about 30GB each). I am currently trying to restore the ...
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Can a large number of (small) files degrade the performance of a filesystem?

I'm working on an archival project and currently I'm storing 514600 images (ranging from 200kb to 2mb) on my 4TB NAS drive. The drive itself is formatted as ext4 and I'm writing the files over the ...
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714 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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991 views

Moving 2TB (10 mil files + dirs), what's my bottleneck?

Background I ran out of space on /home/data and need to transfer /home/data/repo to /home/data2. /home/data/repo contains 1M dirs, each of which contain 11 dirs and 10 files. It totals 2TB. ...
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ext4 superblock checksum?

I'm reading the ext4 superblock, but its s_checksum (offset 0x3FC) is always zero. Also the s_checksum_type (offset 0x175) field is zero as well, however according to ...