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

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XenServer CentOS VM: EXT4-fs error (device dm-2): ext4_journal_start_sb: Detected aborted journal

I have 2 different CentOS 6.4 VM's on 2 different Citrix XenServer and both have the same error within couple of few days. Output of messages: kernel: Aborting journal on device dm-2-8. kernel: ...
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119 views

XFS as default filesystem in the enterprise

After reading up on the whole data=ordered fiasco that EXT4 went through and how much support there was on it accommodating "broken" applications, I was surprised that a filesystem that is not ...
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An ext4 filesystem spanning multiple RAID arrays and calculating alignment parameters [closed]

So I have the following setup: 3x4TB RAID-5 (Hardware RAID) (two data disks) 5x2TB RAID-5 (Hardware RAID) (four data disks) = six data disks in total? These will be encrypted using LUKS and then ...
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38 views

Pacemaker error on failback with drbd

I have two nodes in my cluster with drbd+pacemaker+corosync When the first node fails, the second assumes the service and it's ok, but when we have to failback (node1 back online) it shows some errors ...
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max files per directory in ext4

I manage an application that contains a filestore in which all the files are stored with the filenames equal to their md5 sums. All files are stored in one directory. Currently there are thousands, ...
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3answers
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Can't resize2fs - combination of flex_bg and !resize_inode

I recently set up my first software raid with mdadm and after adding more disks to the raid I am unable to resize the filesystem to the full size of the raid. I created a single (~16TB) filesystem on ...
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5answers
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How to extend an ext4 partition and filesystem?

I have a 400GB disk with a 320GB ext4 partition. I would like to grow the ext4 partition to use the left space (80GB of free space). +--------------------------------+--------+ | ext4 ...
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2answers
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Linux: Why change inode size?

Tune2fs allows to change inode size from default (128 bytes on ext3, 256 bytes on ext4) to almost anything, but it should be power of two. What are the reasons for changing default inode size? Here ...
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295 views

How i can restrict certain file extension upload via ssh?

How can I restrict certain file extensions and file upload size via SSH? I am using Ubuntu 12.10 default installation and Open-ssh server.
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25 views

Ubuntu 14.04 Desktop as local server - ext4-fs error [migrated]

I have set an Ubuntu 14.04 as a local server. Also I have two identical hdds on RAID1, on md0. I have tested raid configuration and works ok. I installed virtualbox from the official website and keep ...
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1answer
633 views

centos 6.3 increase disk size on /

I have a VM running CentOS 6.3. LVM is not installed. From the VM side, I have increased the underlying disk from 15GB to 40GB, so I now need to expand the partition and file system. I've managed to ...
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3k views

Slow ext4 fsck

Why fsck is so slow on ext4 filesystem? I was always using reiserfs or xfs and with those systems fsck was really fast, just few seconds. Now i decided to give a try ext4 but i'm dissapointed that ...
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Ensuring a repeatable directory ordering in linux

I run a hosted continuous integration company, and we run our customers' code on Linux. Each time we run the code, we run it in a separate virtual machine. A frequent problem that arises is that a ...
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81 views

Resizing a software RAID remotely, no LVM, / partition

I have a server that has a software RAID without LVM. That is only mdadm. There are the partitions /dev/sda2 and /dev/sdb2 which form /dev/md2. There is also a lot of space after both /dev/sda2 and ...
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3answers
4k views

Possible to mount an ext4 partition image via FUSE?

I'm attempting to mount an ext4 partition image in userspace. (no sudo, no special config/permissions modification to /dev/loop0 or /etc/fstab etc). So I'm hoping FUSE will come to the rescue. ...
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1answer
72 views

EXT4 Single Larger Volume or Many Smaller Volumes

My question is regarding the file system performance of EXT4 volumes relative to size. We have a NAS running any arbitrary Linux platform. The NAS has (12) 4TB disks in a hardware RAID 6 with LVM ...
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9 views

find space used by journal files

Is there any way to find the disk space used by journal. Running xfs on host and ext4 on guest. How can we see the space occupied by journals of these filesystem.is it possible.
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238 views

Permission denied to resize filesystem

Im attempting to resize a filesystem on a mulipathed volume that I've grown, rescanned all the disks, and resized the multipath map. # resize2fs /dev/mapper/my_vol resize2fs 1.43-WIP (20-Jun-2013) ...
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369 views

existing files are “invisible” to some applications

I have a problem with accessing files on an ext4 file system mounted as type NFS on a Linux server running CENTOS 6.5. I know the files exist on this file system because I can see them when I ...
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AWS volume from snapshot missing data

This is a weird one. On a new ec2 instance + new data volume attached at /dev/xvdb mounted with: mkfs -t ext4 /dev/xvdb mkdir /mnt/xvdb mount -t ext4 /dev/xvdb /mnt/xvdb I take a snapshot of ...
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14 views

use ext3 with inode size 128 and acl

i saw this in one of the docs that i had read Inode size: The default inode size is 256 bytes. Specify a value in bytes that is a power of 2 and equal to 128 or larger in bytes and up to the block ...
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26 views

Is it possible to update stripe-width on an existing, and used, ext4 fs?

I have a RAID 5 with 5 3TB drives (8 in few weeks), on a Debian. There is only one ext4 partition on it, using all the space available. Actually, due to origins of the RAID (4 drives), the ext4 fs ...
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55 views

Is my default File System ext4

By running df -hT that shows mounted file systems, how can I know if my default FS is ext4? Also as mentioned by one of the MongoDB engineers in this video (@1:13) from M202: MONGODB ADVANCED ...
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145 views

Warning :mounting fs with errors, running e2fsck is recommended

Linux server will hang and when I restart it will take around 2 hours to come up and resume normal operations. I checked the system log files and found mounting fs with errors, running e2fsck is ...
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Testdisk won’t list files for an ext4 partition inside a LVM inside a LUKS partition

I have accidentally deleted a file that I want to recover. The partition is an ext4 partition inside an LVM partition that is encrypted with dm-crypt/LUKS. The encrypted LUKS partition is: /dev/sda2 ...
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LVM on disk with no partition table. How to reallocate free space with fdisk?

I shrank an LVM in half using these commands: e2fsck -f /dev/VG/LV resize2fs /dev/VG/LV 5G lvreduce -L 5G /dev/VG/LV Inspecting the physical volume yields this: --- Physical volume --- PV Name ...
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SSD TRIM (discard) problems with ext4 on Crucial C300 SSDs with CentOS 5.5

Playing around with using a modern kernel (2.6.37 currently) on an older OS (CentOS 5.5) so we can get TRIM (discard) working on our SSDs (Crucial C300s). The most recent hdparm (9.37) concurs that ...
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5answers
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EXT4 “No space left on device (28)” incorrect

I have been through the other questions/answers regarding inode usage, mounting issues and others but none of those questions seem to apply... df -h /dev/sdd1 931G 100G 785G 12% ...
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7answers
4k views

Is btrfs production ready?

I've seen a lot of information on btrfs lately. I have been considering ext4 for my next filesystem, but am tempted by btrfs instead. How widely used is btrfs? What are the pro's and con's?
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238 views

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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exportfs: Warning: /home/user/share does not support NFS export

'exportfs -r' returns me this error when I'm trying to export /home/user/share (ext4): exportfs: Warning: /home/user/share does not support NFS export. /etc/exports: /home/user/share ...
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480 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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3answers
540 views

How to recover data from a messed up drive (LVM written on top of Ext4)?

The previous administrator of a server that is now under my supervision made a mistake. He accidentally created a LVM volume (no more than pvcreate, I think, though not sure) on a disk that actually ...
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1answer
2k views

Can I lvreduce after lvextend without losing the ext4 partition inside it?

In a botched attempt to move my root partition from one disk to another I have done the following: added new disk partitioned it with parted (part #3 is now almost totally filling the disk) ...
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2answers
1k views

No posix acl in debian Wheezy with ext4

I was running a new script and encountered the following error: Your filesystem or build does not support posix ACLs So I thought no problem, just add acl,user_xattr to my fstab. It now looks ...
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Slow ext4 read performance on 24-drive hardware RAID6

I have a RAID6 configuration spanned over 24 drives (12x directly attached to the RAID card, 12x via external SAS) running on an ARECA ARC-1880IX-12 (fw V1.51 2012-07-04). The RAID makes up one single ...
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How can I modify the wtime of ext filesystem

How can I modify the superblock of an ext filesystem so that I can set the field wtime (Last write time)? I've tried with debugfs: debugfs 1.42.9 (4-Feb-2014) debugfs: open /dev/sdd2 -w debugfs: ...
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Centos 5.5 [Read-only file system] issue after rebooting [closed]

I have a virtual server under centos 5.5 (hosted by a japanese company called sakura ) Since yesterday, connection through ssh couldn't be established. I've contacted support center who told me to ...
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2answers
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Running resize2fs on /

I'm trying to resize an ext4 filesystem on a Fedora 11 box. Using fsdisk and lvm, I was able to grow the partition and logical volume containing the filesystem. When I try to run resize2fs on the ...
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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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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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1answer
95 views

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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3answers
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df reports wrong free space for an Ext4 partition

My system is CentOS 6 x86_64 with root partition formatted as ext4. df reports around 3Gb as used space: Filesystem 1K-blocks Used Available Use% Mounted on /dev/md1 ...
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Ext4 self errors after some time on CentOS 5.8 64-bit

I get such warnings in dmesg: EXT4-fs error (device md2): mb_free_blocks: double-free of inode 0's block 602619328(bit 15808 in group EXT4-fs error (device md2): mb_free_blocks: double-free of inode ...
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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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157 views

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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3answers
9k views

changing filesystem format from xfs to ext4 without losing data

I have a fresh Lucid Lynx (Ubuntu 10.04) running on a laptop. where I defined the filesystems as: mount point / on ext4 (46 Gb) mount point /home on jfs (63 GB) swap as 3 Gb I left the machine ...
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844 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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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 ...