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

learn more… | top users | synonyms

5
votes
0answers
15 views

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 ...
1
vote
1answer
28 views

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, ...
0
votes
1answer
13 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 ...
1
vote
1answer
32 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 = ...
2
votes
3answers
110 views

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 ...
1
vote
2answers
40 views

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 ...
1
vote
0answers
14 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 ...
1
vote
1answer
53 views

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 ...
3
votes
1answer
47 views

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 ...
0
votes
1answer
62 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 ...
3
votes
0answers
133 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 ...
0
votes
1answer
94 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 ...
0
votes
0answers
28 views

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 ...
1
vote
0answers
15 views

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 ...
0
votes
0answers
152 views

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 ...
1
vote
3answers
96 views

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 ...
2
votes
2answers
61 views

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 ...
2
votes
3answers
138 views

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 ...
3
votes
0answers
225 views

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? ...
4
votes
1answer
291 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 ...
1
vote
1answer
84 views

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 ...
2
votes
1answer
1k views

“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 ...
0
votes
0answers
266 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 ...
2
votes
0answers
201 views

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 ...
1
vote
1answer
229 views

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 ...
4
votes
2answers
683 views

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 > ...
0
votes
0answers
61 views

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 ...
2
votes
1answer
241 views

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 ...
0
votes
0answers
28 views

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 ...
1
vote
0answers
77 views

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). ...
1
vote
1answer
51 views

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?
0
votes
2answers
268 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?
2
votes
2answers
242 views

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 ...
2
votes
2answers
57 views

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 ...
4
votes
1answer
117 views

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 ...
1
vote
1answer
147 views

ex4 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 ...
1
vote
0answers
22 views

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?
11
votes
1answer
2k views

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 ...
2
votes
0answers
163 views

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 ...
6
votes
2answers
1k views

“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 ...
7
votes
3answers
3k views

External hard drive permissions - ext4

I have an external USB 3 disk drive (2TB capacity) that is most likely going to be moved from machine to machine. The disk has a GUID partition table and an ext4 partition. I am unable to write to the ...
3
votes
2answers
799 views

Large ext4 partition ridiculously slow when writing

We have four identical Linux servers with a large (5T) hard disk partition. We have Scientific Linux with this kernel: Linux s3.law.di.unimi.it 2.6.32-358.18.1.el6.x86_64 #1 SMP Tue Aug 27 14:23:09 ...
3
votes
0answers
100 views

Optimal rootflags for rootfs for ext4 file system running on USB thumdrive [closed]

I have made myself a bootable USB Debian 7 thumbdrive, using debootstrap. It boots nicely - but occasionally freezes for a bit. I can see the load average is much higher than the running tasks should ...
3
votes
1answer
84 views

Where does ext4 store directory sizes?

Where does ext4 store directory sizes? Are they stored in the directory inode? For example, when I run du -h, it returns directories' size instantly, so I don't believe it calculates it at that time. ...
1
vote
3answers
326 views

How much storage overhead comes along with cryptsetup and ext4?

I want to encrypt the content of a directory in a container with an ext4 filesystem using cryptsetup. The size of the container should be as small as possible and as big as necessary, because I only ...
5
votes
3answers
230 views

What filesystem metadata operations are actually journaled in ext4 & xfs?

I can't find a simple, straight answer about which filesystem metadata operations are actually persisted to the ext4 & xfs filesystem journals. Note that I am not inquiring about what POSIX ...
2
votes
1answer
264 views

Why does fstrim trim all of the free space on my mdraid mirror after a reboot? [duplicate]

I have a server with 2 SSDs: Model Family: Intel 520 Series SSDs Device Model: INTEL SSDSC2BW240A3F Firmware Version: 400i User Capacity: 240,057,409,536 bytes [240 GB] Sector Size: ...
0
votes
2answers
120 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 ...
1
vote
1answer
225 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 ...
2
votes
0answers
29 views

ext4 flags to specify “extents” mode?

I've formatted a new filesystem with and without extents feature just to understand how this feature works. However, when I look at the inode field i_flags I see that this field always has zero value ...