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

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Why doesn't the owning group get the executable bit? [duplicate]

Playing with ACL's: [root@rex web]# pwd /media/web [root@rex web]# ll -d drwxr-xr-x. 2 root root 4096 Jan 1 14:31 . [root@rex web]# setfacl -m d:g::rwx . [root@rex web]# setfacl -m g::rwx . ...
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Delay before new/modified file appears

I'm seeing two separate cases where there's a (random?) delay before a new or modified file appears. The first case is my Rails development environment: I modify a code file (in vim) and save it, ...
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23 views

Find duplicity files after using PhotoRec

I've partly formatted a disc where my duplicity files was stored. I have used PhotoRec to recover the files but now they're all unsorted and without the correct filename. I have the files separated by ...
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What does the 'barrier' mount flag mean in Linux?

The manual for the 'barrier' mount option is: barrier=0 / barrier=1 This disables / enables the use of write barriers in the jbd code.barrier=0 disables, barrier=1 enables (default). ...
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ext4 to btrfs conversion: Can I pause, reboot the system and then resume the conversion? [duplicate]

I want to convert a rather big ext4 volume into btrfs. How long will the process will take?
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347 views

Best parameters for ext4 filesystem to handle virtualbox disk images

I have ext4 partition, which holds disk image files VirtualBox works with. They all are fixed-size images (i.e. files never change their size). They are defragmented as much as possible (with ...
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targeting a specific block with e2fsck to shorten wait

Recently had a LVM'd CentOS 6.5 install get accidentally cold-shutdown. On bootup, it says that the home partition need fscking: /dev/mapper/vg_myserver-lv_home: Block bitmap for group 3072 is not ...
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140 views

Optimization for an SSD?

I am running Fedora 20 on a Laptop ( Lenovo Ideapad Yoga 2 Pro ) with an SSD. My filesystem is LVM with ext4 as the format option. I am now running Fedora as the only OS on the system with Legacy BIOS ...
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Formatting external USB Harddrive ext4

What is the best way to format a non-ssd harddrive with ext4, for as fast as possible usage with a very low performance computer? I mean, options like disabling things (journaling, ...) that slow ...
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How to blacklist bad blocks from a MD-raid + dm-crypt + ext4?

I have a ext4 partition, on top of a dm-crypt, on top of a MD-RAID 10. One partition (/dev/sdc1) dropped out of the array with a ton of read errors. I ran the manufacturer provided diagnostic tool ...
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143 views

Disk partition emptied during tar backup

This morning I was doing a routine backup of my development drive, one of 4 primary partitions on my hard-drive. The script I ran was: filename="/home/Backups/Devi_"`eval date +%Y%m%d`".tgz" touch ...
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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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349 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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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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362 views

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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How to obtain the whole disk activities triggered by file systems under linux?

I want to record the disk access activities called by OS. Such data I want to record are received by disk from OS, including disk sector number, request length, arrival time, read or write. To be ...
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Reinstalling Debian: ext4 partition is not primary

I previously had a grub bootloader with crunchbang and win7. Since then I reinstalled win7 which now boots it automatically. I stuck in a Debian install CD that brings me to the stage in the above ...
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7-Zip slows down over time on Ubuntu but not Windows

I have a directory called Pages of 2.2 million HTML files (about 80 GB) on an Ubuntu server. I compressed it with 7-Zip using this command: 7z a -mx=9 Pages.7z Pages It took around 5-6 hours to ...
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writing to ext4, 8GB partition vs 512MB partition

I have a question which is slightly programming related, but it mostly relates to how ext4 works. I have a program which writes 128MB to a file with changing random aligned offsets. I write 256KB ...
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510 views

how to restore a logical partition to it's 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 partion, lovingly ...
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1k views

Keep ext4 journal on another system, how much space would be necessary?

I'm going to move journal to another partition, but I don't know how to correctly caculate the size needed for journal? I'm running ext4 file system with 15GB capacity.
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Precaching the list of files of the filesystem

I was wondering where and in what form a list of files and directories is stored on the ext4 filesystem. The problem is that whenever I try to access a certain directory for the first time since boot ...
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Accidentally ran mkfs.vfat on my backup drive [duplicate]

I ran mkfs.vfat /dev/sdb (whole device, not just one partition) on my backup drive, ironic, right. Is there any way to recover my files.
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117 views

du and ls commands reporting wrong directory size

I'm used to the du command. I often use it with -h option. I report the result in a text file which I use to track space consumers. But I was wondered today to see a directory being reported as using ...
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35 views

Smallest file block size (ext 3, 4)

I'm curious, what is the smallest size a file can really be on Linux? (Assuming Ext3 fs, so why not ext4 fs as well). Sure you can write a file that only contains one byte, or maybe even less; but ...
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157 views

Which file system is better for Ceph?

I've read the Ceph OS recommendations document, but still I have a question. Which file system is better for Ceph? XFS, ext4, or something else?
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135 views

automount ext4 external hdd partition for owned by specific user

I'm trying to figure how to mount an ext4 formatted external HD with permissions for a specific user using autofs, but I'm only able to mount it as owned by root. I have read that ext4 mount points ...
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412 views

Unable to delete file “ldlinux.sys” from a partition

I wanted to create live bootable USB of gparted via unetbootin. But by mistake I specified the device of USB as a partition of external HDD rather than the USB drive. I deleted all the files that ...
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635 views

Linux: Recover files from .vdi file

Somehow my .vdi (Linux guest OS) file got corrupted. Now I have some files in it (Inside the vdi file) and I want to recover those files. How can I do that?
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225 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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56 views

Are there any tools to recover files from a previously formatted WinNT drive?

I scratched the previous Windows NT filesystem, now I'm running Ubuntu. I've created the whole disk as EXT4. Are there any tools to locate and save some previous Windows files from the original ...
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256 views

Recovering truncated file

I'm in a peculiar situation. While editing a Perl program I accidentally truncated the file to zero length (using an Emacs lisp code I was developing). I need to recover that program... How do I that ...
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170 views

e2fsck giving some error

I am playing with LVM and while doing lvreduce. I now get this error: [root@localhost raja]# e2fsck -f /dev/vg1/lvol2 e2fsck 1.41.12 (17-May-2010) e2fsck: Superblock invalid, trying backup blocks... ...
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How can I recover damaged file from overwritten ext4 partition?

My disk, which was previously ext4 has been formatted and Windows has been installed. I want to recover my previous files (family photos, ..) and I tried everything I could find on the internet. I ...
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2k views

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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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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e2fsck repairing an ext4 file system - how to enforce ext4 features?

I have a huge (1.5 TB) corrupted disk with an ext4 fs. The master superblock (and journal) are corrupt, so I am trying to repair it using e2fsck -f -b 7962624 -y /dev/sdb1 Now, the first thing ...
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Repeated Ext4-fs error with comm psad: invalid block. Does it mean the SSD is dying?

Configuration : Debian Jessie with SSD. /dev/sda1 is root filesystem, /dev/sda6 is home filesystem. Errors occurs only on /dev/sda1. For the third time, I've got software errors because the root ...
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Lvreduce online on RHEL 6 or centos 6 with ext4 file systems

Is it possible to reduce a mounting lv safely at RHEL6/CentOS6 with ext4 file system? If it is, how can I do that?
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testdisk partition recovery

Looking to recover data/partition index from this disk.. ⚡ root@jg  ~  ls /dev/disk/by-label lrwxrwxrwx. 1 root root 10 May 4 21:06 4tb1 -> ../../sde1 drwxr-xr-x. 7 root root 140 May 4 21:06 .. ...
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can I boot ext4 usb stick with xubuntu on from a Mac laptop?

is there a way to boot my ext4 formatted "xubuntu" USB memory stick from a Mac laptop? The laptop can identify FAT32 usb memory sticks with ubuntu at boot time, but it cannot identify mine, which is ...
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Difference between fsarchiver and dump

What is the difference between dump and fsarchiver? Are there features in dump which are not covered by fsarchiver? Can both backup to tape storage for example?
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find the cause of file corruption when copying files to a network share on an Ubuntu machine

I am copying files from my SD card to my Ubuntu server via Windows 7 using a network drive. The problem is that sometimes, 2 files out of 150, are corrupted during transfer. See here 2 example files ...
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Debian..Can't format and mount external HDD

I have been trying to format my 640GB external Hard Drive in command-line and can't seem to get it working. I have done the following in order: sudo fdisk /dev/sda (Deleted any partitions, created ...
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Restoring data from NTFS formatted pre-ext4 partition

MS recovery just formatted my 1TB Backup disk to NTFS which was ext4 before. It was an MBR disk before but now it's a GPT one. Now I'm on SystemResqueCD and can check with the testdisk. What is the ...
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Recover Data from EXT2 (previously EXT4) partition [duplicate]

When trying to repair "group descriptors" on my EXT4 2TB drive, I have made a mistake. Instead of use this command: e2fsck -b block_number /dev/xxx (using the block number of a backup superblock) ...
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524 views

Why the size of an empty directory in Linux is 4KB? [duplicate]

I'm using Ubuntu 14.04 and I made an empty directory on /tmp with the mkdir command: cd /tmp mkdir foo and then I checked it's size using ls: ls -ldh foo and the result shows that the size of ...
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Getting partition boundary error when using GPARTED

I am trying to allocate my hard disk with below set of partitions using GPARTED. /dev/sdb1 - 256 MB /dev/sdb2 - 2048 MB With free space preceding as (4 Mb) between partitions. After applying the ...
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619 views

Good Bye lvreduce, hello lvresize?

I've found a couple of times that using lvreduce, (first unmounting, shrinking ext4 with resize2fs, and fsck'ing) ends in: mount: wrong fs type, bad option, bad superblock on ...
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ext4 data recovery from gparted error

During resizing and moving 2.7TB partition in Gparted, I encountered an error that froze the whole program. (I dont have a screenshot or output from it, as fas as I remember, it was something about ...