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

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What is this data that keeps reappearing after partition delete + new partition creation?

I deleted a big extended partition containing an ntfs logical partition with high percentage of occupied space and from that extended partition I made a new, smaller extended part. In it I ...
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Installing an external drive for 24x7 in Raspberry (ext4 or ntfs?) [closed]

I'm just installing a new hard drive (wd mypassport ultra usb3). it has 1tb of space. It will be mounted 24x7 on an raspberry server, for sharing media and documents on my familiy house. I use it ...
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Recovering from bad superblock on external drive

read a few similar questions/posts and tried the solutions, still stuck. My scenario is simple, external ext4 drive was powered off (via cat) while operating, and failed to mount on boot. As I dug ...
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Write to ext4 filesystem hang while lazyinit in background

I am running SUSE 12 on a node that has 6TB disks attached with EXT4 filesystem initialized. Lazyinit in the background takes atleast 24 hrs to complete. Write performance to the disk is significantly ...
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“First orphan inode” in tune2fs output

I ran tune2fs -l /dev/sda on my production server today and got the following output: tune2fs 1.42.9 (4-Feb-2014) Filesystem volume name: <none> Last mounted on: / Filesystem UUID: ...
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Tiny directory on ext4 file system taking up 2024 blocks? [closed]

I have an ext4 file system on my work computer and I came across a directory that is taking up >1 mb of space. There are 7 entries in the directory. The directory hasn't ever contained more than 20 ...
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Can I find out if a given ext4 block is in the inode table, and if so, can I pick it out of a journal with no header by hand?

So en route from my old laptop to a new one my old laptop's hard drive got some physical damage. badblocks reports 64 bad sectors. I had a two-month-old Ubuntu GNOME setup with a split / and /home ...
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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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What are the implications of using an inode_ratio of 16384 in terms of storage use on ext4?

I'm assuming that this means that if the average file stored (including directories etc) is less than 16384 bytes, it may be possible to run out of inodes before using the full storage capacity of the ...
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Size Range of ext4 Filesystem Journal

The minimum and maximum sizes respectively for the ext3 filesystem journal are 1,024 blocks and 102,400 blocks. Similarly — what are the minimum and maximum sizes for the journal on an ext4 ...
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rsync hangs unless I defrag ext4 filesystem

I have a XBian server (Raspberry Pi version of Debian) running rsync via inetd (not the native dæmon). I am serving a couple of directories on an ext4 filesystem (on a USB disk) as individual modules ...
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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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39 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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51 views

How to increase the size of Linux Partition (EXT4) without loosing data when the swap partition is exactly after it?

I have a problem and I appreciate if anyone can help me. 1: fdisk -l: Disk /dev/sda: 320.1 GB, 320072933376 bytes 255 heads, 63 sectors/track, 38913 cylinders, total 625142448 sectors Units = ...
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how should I mount my ext4 partition in fstab

so that it appears in Thunar's sidebar under the name 'Schijf-2'? I am running linux mint13 xfce and this has been a headache causer for the last couple of days. the UUID of this partition is: this ...
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data recovery from form an accidental format on ext4 partition

When I was installing Mint Debian edition unlike the classic edition, the installation automatically formated my home partition when I did not specify to format. So the formatting previously was ext4 ...
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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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How to extract raw ext3 inode data from disk?

On an ext3 (or ext2/4, pick your flavor) filesystem, how would one extract raw byte data that corresponds to a particular inode directly from the hard drive? Is it possible given, say, an inode number ...
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How to update directory size after file removal?

This is mostly theorethical question without real practical usage. As you may know, filenames are stored in directory inode. That means the more files we have and the longer filenames are the more ...
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116 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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318 views

Grub rescue after corrupted hard-drive (“read-only filesystem”)

I run xubuntu 12.04 alongside a NTFS storage partition and a windows 8 partition. I moved my MySQL data directory off the xubuntu (ext4) partition, onto the NTFS partition, and did an import of a ...
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141 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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Many transient files on journaled filesystem?

Writing and deleting many files quickly I'm going to write many temporary files per second, over a sustained period. Each will be deleted after some milliseconds. Say we have an image processing ...
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mkfs.ext4: Discarding device blocks: failed - Input/output error

I am trying to format my new SD card, using following command; mkfs.ext4 -O ^has_journal /dev/mmcblk0p2 and I get following error: Discarding device blocks: failed - Input/output error I don't ...
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Why does find -inum iterate through the whole filesystem tree?

It surprises me to see find iterate/walk through the complete filesystem when I do a simple find -inum 12345 Without background info it seems to me that there should be much easier ways for to tell ...
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How can I mount a filesystem, mapping userids?

I can successfully mount an ext4 partition, the problem is that all the files on the partition are owned by the user with userid 1000. On one machine, my userid is 1000, but on another it's 1010. My ...
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How to repair a file system corruption?

Debian on external USB SSD drive. There was some error in dmesg log file: ...[ 3.320718] EXT4-fs (sdb2): INFO: recovery required on readonly filesystem [ 3.320721] EXT4-fs (sdb2): write access ...
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Which file system (among XFS, BTRFS and EXT4 only) does provide the best data resilience to disk corruption? [closed]

Question: Given these three filesystems: XFS, BTRFS and EXT4, I'm wishing to know which does provide the best data resilience to data corruption in a setup without RAID. And, of course, why? ...
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435 views

Advantages/disadvantages of increasing “commit” in fstab

I have done many obscure system optimizations in the past, but I got rid of most of them after powertop told me I should set my USB ports to autosuspend, which forced them to an eternal sleep, and ...
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archlinux check disks on boot

How can I check and mark bad blocks on Linux startup? There are a number of options available and most of them require accessing hardware and running live CD's. But I would like to avoid and perform ...
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“inode_size (128) * inodes_count (0) too big for a filesystem with 0 blocks” while creating a file system

My partition table looks like this: Device Boot Start End Blocks Id System /dev/sda1 * 2048 32505855 16251904 83 Linux /dev/sda2 32505856 33554431 ...
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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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CentOS 5.6 expand ext4 partition , have steps but parted shows as ext3

I have a Adaptec 5805 HW RAID card with a 6.3 TB RAID-6 array (partitioned via Parted GPT, all of which is formatted as ext4 on CentOS 5.6). I want to expand this to 7.5GB and from reading these are ...
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harddisk not recognized / filesystem too large to mount safely on this system / hdparm shows garbage

I have a 4 TB Verbatim external hard disk with ext4. It can be successfully mounted at my Raspberry Pi. I am trying to plug it at my WD Mybook Live Duo device where I have SSH root access. When I ...
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Can overwritten files be recovered?

I am not talking about recovering deleted files, but overwritten files. Namely by the following methods: # move mv new_file old_file # copy cp new_file old_file # edit vi existing_file > D > ...
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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 ...
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ext4 filesystems frequently corrupting

We have occasional power outages in our environment which seems to cause data corruption on our Ubuntu machines with ext4 filesystems. To my understanding ext4's default is to use data=ordered ...
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Could I disable ext4's journaling safely in BBWC?

I knew set "nobarrier" flag is safe in BBWC when using ext4,but since "nobarrier" flag couldn't ensure proper order of journal logging and data flushing,then it seems journaling is useless。So is it ...
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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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Could I set flag “barrier=0” when using SSD?

I'm using ext4 filesystem in SSD,when mounting SSD,could I use flag "barrier=0"? I knew this flag is safe for BBU(battery backup unit),but is it safe for SSD?
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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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How to give Windows partions' file execute permission

I have installed Linux Mint 17 and Windows 8, as dual boot. 500GB hard disk has 5 partitions. Two of them are NTFS and the other 3 are ext4 partitions. When I log into Windows, I can not see any ...
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How can I capture a consistent snapshot of a directory and all its children?

We have an application that periodically backs itself up to a directory on the local file system. Inside this directory are several more files and directories. I want to produce a "snapshot" of all ...
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What is the difference between fsck options -y and -p?

The ext2/3/4 filesystem checker has two options that seem to be very similar, -p and -y. Both seem to perform an automatic repair, but the manpage states that -p can exit when it encounters certain ...
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ext4 to btrfs conversion: If I accidentally lose power to the system during the conversion, will I lose the data?

I want to convert the 3TB 80% full ext4 block device into btrfs and I want to estimate the risks involved in the process. If I accidentally lose power to the system during the conversion, will I ...
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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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Is data=journal safer for Ext4 as opposed to data=ordered?

The default journal mode for Ext4 is data=ordered, which, per the documentation, means that "All data are forced directly out to the main file system prior to its metadata being committed to ...
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Mount from auto to manual and changing dir gives errors

I just installed Ubuntu 14.04 and am trying to mount my internal HD to a different location in the /home/username dir (auto-mount mounts it to /mnt/{uuid} ) But I ran into a problem. In Disks, when ...
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“Converting” a filesystem from ext3 to ext4

I've read on some Q&A on this website that one can "convert" an ext3 filesystem to ext4 without formatting, by issuing tune2fs -O extents,uninit_bg,dir_index /dev/dev-name And then running ...