The ext4 or fourth extended filesystem is a journaling file system for linux/*nix developed as the successor to ext3.

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First 500MB of RAID6 array is wiped, how to recover?

We have a RAID6 array with 12 disks on a 3ware 9650SE-12ML controller. An engineer of our server provider issued this command by mistake: sudo dd if=/dev/zero of=/dev/sde bs=1M count=500; sync; ...
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Recover LVM with software raid [migrated]

I am a very desperate man right now. 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 ...
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177 views

Transparent compression filesystem in conjunction with ext4

I am trying to test a project that needs compressed storage with use of the ext4 file system since the application I use relies on ext4 features. Are there any production/stable solutions out there ...
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impossible creating a ext4 fs with block size of 1024

Im triying to build up a new server for a service that saves the data on very small files of max 1 kb on the fs. The problem its, now we are using a block size of 4 kb and we are wasting a lot of ...
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45 views

Linux filesystem ext4 fragmentation

I have a question about the filesystem ext4 and disk fragmentation: Does ext4 place files in the same directory near or next to each other on the disk? And if so how is it fragmented, for example is ...
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How can I grow an ext4 filesystem inside a dm-crypt/LVM volume?

I have a disk with this format: sdc 8:32 0 1,8T 0 disk └─sdc1 8:33 0 1,8T 0 part ├─vg-lv1 (dm-0) 254:0 0 900G 0 lvm ...
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Cannot set ACL on ACL-enabled EXT4 partition

I am trying to enable xattrs and acls on a Debian machine. I've (re)mounted the partition in question with user_xattr and acl. (/dev/md3 is the partition in question) root@fs01:/# mount | grep ...
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72 views

Remount root RW without reboot

Today I did something stupid on production xen vm server. I mounted the external device mapper as read only to make a copy of the filesystem. This process went well but then the rootfs / become ...
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43 views

Replacing files with symlinks takes more space - Fedora19 EXT4

Background: We are using PHP CacheLite. In order to have a human readable path to cache files cache_{hash}_{hash}, there is a symbolic link that is more descriptive of the cache contents. We ...
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Software-RAID with ext4 but without 64bit support

last year I set up a Software-RAID5 with 5x3TB yielding 12TB of usable capacity. Just today, needing more storage, I have finished growing the RAID to two more 3TB disks: Personalities : [linear] ...
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How do I replace the root filesystem (ext4) with a new one in LVM with one which has more inodes?

I have a few systems which have been running over a decade in a cluster on SLES 10 (now long past EOL). We're migrating to CentOS 6 64-bit. I got everything done but the final data syncs, and lo and ...
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42 views

How do I allow users to add/modify files in a directory but not change the directory - Linux

How can I modify a directory so that it is owned by a group and users in that group can add and delete files and create sub directories but are unable to change the permissions on the parent ...
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55 views

fsck ext4 inode error

Today while I was booting I got an error in an ext4 partition with some inodes. I just entered the root password and run fsck manually but I am a bit worried. fsck warned many times about some errors ...
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267 views

Loss of data when trying to fix ext4 “group descriptors corrupted!”

When I try to mount an existing disk, I get the message sudo mount -t ext4 /dev/sdc1 /data mount: wrong fs type, bad option, bad superblock on /dev/sdc1, missing codepage or helper program, ...
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Sharing disk space between two Ubuntu hosts [closed]

I have two Digital Ocean droplets (Ubuntu 14.04 LTS VPS instances): Alice: 40GB disk / 38GB used Bob: 20GB disk / 2GB used Alice’s storage needs will continue to grow slowly but steadily. Rather ...
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98 views

How to increase inodes? [duplicate]

How can I increase the maximum amount of inodes available on a dedicated server running CentOS 6.5 and ext4? The websites we are hosting create and use millions of small files. We are already hitting ...
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53 views

How to add partition table to existing EXT4 filesystem

I have software RAID6 on 8x3TB disks (18TB), there is filesystem od device /dev/md1, but EXT4 can`t be bigger than 16TB so there is 2TB of free space. I would like to use this space. My first idea was ...
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168 views

Best parameters for ext4 filesystem for storing virtualbox disk images

I have partition, which I'm going to use for keeping VirtualBox disk images (VDI, or may be VMDK). They are fixed-size (not dynamically-allocated) images. There are no other files/directories on ...
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68 views

how to fix a PV in LVM without uuid in a new linux?

I have a server which its first hdd was broken , the server has 2 HDD , the first hdd crashed . datacenter replaced it for me with a new hdd. the second hdd used to have 2 PV on 2 partitions , and ...
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378 views

recover a damaged partition table with ext4 fs

I have an external 2TB HD, that should have only one ext4 partition but the partition table is damaged and I'd love to rebuild/restore the partition. Things ain't that easy so here's the longer ...
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79 views

/proc/self/mountinfo per-mount-options vs per-super-options

I am trying to check for the current status of a mounted partition, rw/ro. On Cent6 /proc/self/mountinfo has some interesting info. One of the items contained in the output for each mount point is ...
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421 views

ext4 root filesystem corruption under XenServer 6.2 DomU

We're with a problem with filesystem corruption in guest machines in a XenServer 6.2 It only happens in Linux Machines. Randomly the filesystem remounts as read-only and them corruption starts on the ...
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199 views

Failing to mount root from ramdisk while PXE boot

I have a working TFTP/DHCP PXE boot environment where I've already booted some images successful. Now I built an CentOS 6.5 diskless image and this one is failing booting with the following error: No ...
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62 views

Why is file rewrite slower?

on Linux, using various benchmark tools (bonnie++, iozone, etc) on ext4 (but i guess it's the same on other FS), rewrite is always slower than write to new files. For example, using bonnie++, with ...
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ext4 production ready on kernel 2.6.32 (debian6)?

I've to maintain a production system on debian6 (kernel version 2.6.32). I'd like to use ext4 on a ssd disk (and generally hope to improve performance upgrading from ext3). I can't find any reference ...
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What happens if fsck.ext4 -y is run on a ext3 fs and how to I recover from it

I had a mountable fs (pretty sure it was ext3), fsck.ext4 was run with -y and ended in a segmentation fault. Now it is unmountable (dmesg says it's corrupt) and identifies as a ext4 fs via the "blkid" ...
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448 views

Qnap TS-410 deleted folder by accident anyway to recover data (raid 5 / ext4)?

I am not in a very good situation at the moment, and bit stressed! I have a Qnap nas (TS-410), this operates on a Marvell 6281 800MHz CPU, while I SSH'ed into the Nas box, I deleted the wrong folder ...
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329 views

SMB Share (samba) Centos 6 Mounted hard drive Permission Denied

I have set up a SMB share on Centos for all users. This share is available and working correctly. Guide followed -> CentOS 6.4 Samba Standalone Server With tdbsam Backend Procedure: For diagnostic ...
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170 views

Kickstart partitioning with ext4 in autopart mode?

When installing CentOS 6.x, how to specify the filesystem type with ext4 and also use the autopart directive in kickstart file? The default filesystem type with autopart directive used is ext3, which ...
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526 views

Unable to repair ext4 filesystem, getting errors(

I just tried to boot from live CD and checked my file system using fsck,fsck.ext4, no errors was reported/fixed (i.e. says file system is clean), yet when I'm inside of system it tells me something ...
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FS for many small files, mostly reads?

I need a direction since all the blogs/benchs seems to contradict. Goal: Having a lot of small files on FS in a directory tree fashion similar to this AB/CD/EF... Two size groups : G1 : 10-20 kB G2 ...
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232 views

remount / move root folder to another partition on centos

We have an EC2/CentOS6 instance with "/" mounted to an EXT4 partition, and now another bigger sized hard disk formatted in XFS attached to the system. Since the former partition for "/" is ...
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Partition required for ext4 filesystem?

I read on the arch wiki that it is not recommended to partition a disk before creating the ZFS filesystem on it. I searched but did not find any such statement about ext4. So my question is: can I put ...
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636 views

How can I compact the VHD file with Ubuntu?

I use windows server 2008r2 with role Hyper-V. The guest system is Ubuntu 12.04 LTC. It is situated on the dynamic virtual hard disk. I want to compact this VHD (The real size is 50 GB, 360 GB on the ...
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Decrease block size of ext4 on lvm

is it possible to ecrease block size from 4096 to 2048 of an ext4 on lvm partition without loosing data? Thanks for Help Heiko
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60 views

How can I deal with a directory on an ext4 volume that has so many files ls won't work?

I setup a motion detection software on linux and in the process created a directory with so many jpg files in it that running "ls mydirectory" just hangs. How can I split the content into several ...
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How can I recover an ext4 filesystem corrupted after a fsck?

I have an ext4 filesystem on luks over software raid5. The filesystem was operating "just fine" for several years when I was beginning to run out of space. I had a 9T volume on 6x2T drives. I began ...
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Direct I/O on Linux

I'm trying to enable Direct I/O on /opt (/dev/sda6, ext4) on Linux Mint 13. What I'm trying is: mount -o dio,rw /dev/sda6 /opt as root. The system responds with: mount: wrong fs type, bad ...
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Linux: File is not shown in ls but cannot be touched with message “File exists”

I can remember creating this file but it disapeard. But not completely: root@XXX:/etc/vz/conf# ls -al total 0 drwxr-x--- 2 root www-data 0 Okt 1 16:04 . drwxr-x--- 2 root www-data 0 Okt 1 16:04 .. ...
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151 views

How to calculate available space using tune2fs

I know that I can get the available space in a partition with df, for example: S.ficheros 1K-blocks Usados Disponibles Uso% Montado en /dev/mapper/vg_sebelk-otherdistro ...
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ext4 listing of files very slow in one specific directory that contained lots of files before

Background I had a small logrotate misshap... Logrotate would rotate the archived logs by misstake causing a quadratic growth of files in my /var/log/. And by the time I caught wind that something ...
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387 views

An LVM snapshot of an ext4 fs does not seem very clean

I create an LVM snapshot of a mounted ext4 fs: lvcreate -L 10GiB -s -n "root-snapshot" "/dev/myvgname/root" If I then run e2fsck on /dev/myvgname/root-snapshot, it says: e2fsck 1.42.5 ...
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Samba4 provides high I/O load

I use sernet-samba package (version 4.0.9-6) on Debian 7. Samba configured as additional AD controller. Samba process infinitely writes something to disk and makes high I/O load: Total DISK READ: ...
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How to convert lvm to ext3/4? [closed]

I have an old box(CentOS 5) that was formatted as lvm but now I want to convert it to ext3/4 file system without losing data. I have some empty disks that can be used, so is there an easy way to do ...
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Can quotas be turned on automatically when file system is mounted?

I was not clear on this point-- I have quotas enabled in /etc/fstab for several file systems on a file server. However, I have noticed that if I unmount the file system and then remount it (ext4), ...
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Zero byte files after power failure - ext4 centos 6.4 [closed]

Files written within a minute of a power failure are zero bytes when the system comes back. Testing for a system that we can not guarantee will have ups backup. Centos 6.4 kernel ...
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Is it possible to on-line shrink a EXT4 volume with LVM?

Today I tried this on my machine with OpenSUSE 12.3 (kernel 3.7): # resize2fs /dev/mapper/system-srv 2G resize2fs 1.42.6 (21-Sep-2012) Filesystem at /dev/mapper/system-srv is mounted on /srv; on-line ...
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Re-creating a filesystem on runtime (need more inodes)

I have a machine at a datacenter with 3HDDs and running Debian Wheezy, at one of them I have an ext4 filesystem mounted on /data that has ran out of inodes (I've chosen an inappropriate inode size at ...
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302 views

Impossible to read / delete some files

How can I fix a message like this (read after a dmesg command)? EXT4-fs error (device hdb1): ext4_lookup: deleted inode referenced: 119197 EXT4-fs error (device hdb1): ext4_free_inode: bit already ...
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Multiple VMs mounting and writing on the same partition

I have multiple VMs ( XEN domains ) which are getting data and writing it on a directory in a ext4 partition. Is this going to introduce data loss or corruption?