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

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ProxMox I/O Errors on EXT4 FS [closed]

I recently got ProxMox up and running after months of deliberation as to which HyperVisor I wanted to use. Last night I almost finished transfering my applications to containers and the system was ...
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19 views

SSD fstrim on CentOS 6.x with software raid5

I have some CentOS 6.x servers. They have software raid1 and fstrim works well there. On one of the servers, I decided to do software raid5 and ext4. I can mount it with discard and there is no error ...
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21 views

Remove the 64bit option from ext4 filesystem

I have a 50GB ext4 FS that was mistakenly created with the 64bit extension. I'd like to know the extension can now be removed or if it is necessary to start from scratch. This link suggests that it ...
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33 views

unmounted logical volume is “busy”?

I'm trying to shrink an ext4 filesystem on a CentOS 6 server. I did a lazy unmount of the filesystem while I waited for some processes to finish running. They've all finished running but I can't ...
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80 views

Copying data over with rsync causes size discrepancies

I am switching machines and have attached the old hard drive (/dev/sda4) to the new machine. The old machine had a slightly smaller hard drive (720G), compared to the new one (736G), so I created a ...
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25 views

Bit copied a disk image using the dd command to a new and bigger disk. How do expand whole LVM? [duplicate]

I just copied a 50 GB disk image using dd for bit copying to a new harddisk with 200 GB storage. On the disk is LVM including the system partition EXT4 and a swap partition (both LVs). Well the copy ...
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18 views

Need to recover a file using extundelete. Is there any risk about running it without unmounting, aside from that the partition might keep writing?

I need to recover a few files from a Linux machine. These files are important, but not enough to warrant dismounting the partition. Is there any risk from running on a mounted partition, except from ...
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1answer
27 views

How to mark a linux volume as a blank/empty (before deleting partition table)

I have a bunch of disks where the partition tables are very similar (nearly identical) I need to 'erase' these disks, such that when a new partition table is created any volumes that existed prior to ...
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28 views

Can I safely store mac and windows backups on an ext4 filesystem?

I want to store time machine backups on a storage server running ubuntu server with an ext4 filesystem. If I only ever interact with the server over the network, will I be able to safely recover this ...
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42 views

change file system from ext3 to ext4 effict on MySQL

I have a situation where MySQL was installed in Linux with a ext3 file system. One table (InnoDB) reached the maximum size allowed for ext3 (2 TB) , insert statement gave "The table 'foo' is full". I ...
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33 views

Two ext4 mounts, fully rsynced, same total file amount, but different total byte size. Why?

Problem We have two mount points on two disks, both are the exact same type. Both disks are formatted ext4. An rsync command with options to synchronize from source to destination is performed. ...
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98 views

tmpfs file system is full. Need assistance to increase this or remove unneeded software

Almost at a loss here. Been running a fast server for a couple of years with Plesk. Hosting our own website and services. Over the last few days, I noticed a lot of problems but didn't think to check ...
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3answers
52 views

Rsync size is difference from source to destination

I'm using rsync with the options -r for recursive -l copy symlinks as symlinks -t preserve modification time -D preserve devices and specials -v verbose --prune-empty-dirs The source FS is ext4 and ...
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1answer
103 views

Can Mac OS X extended attributes be stored across NFS to a Linux ext4 filesystem?

MacOSX filesystems use extended attributes (e.g. "com.apple.quarantine", "com.apple.FinderInfo"): $ ls -l@ .DS_Store -rw-r--r--@ 1 gareth staff 18436 2 Nov 10:35 .DS_Store ...
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40 views

Correct permission strategy for Samba DC shares using ACL

I have Samba running as a DC at home. I'm in the process of migrating shares to using ACL's etc instead of the "basic" way of samba to handle permissions etc. On top of this I plan to run Greyhole ...
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12 views

Debian used + available does not equal size (storage) [duplicate]

I'm trying to find out why /dev/sda1 Used+Avail != Size. I ran a df -h and the output I get is this: File system Size Used Avail Use% Mounted on /dev/sda1 320GB 683M 303G 1% ...
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11 views

ext4 journal data will be deleted if I delete and recreate the partition?

If I delete a partition with fdisk and then I recreate it bigger, with fdisk, I know my data will be safe, but the question is: this operation will delete the journal data in ext4?
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68 views

Fsck finds errors in OS, but not using LiveCD

Running fsck on a booted machine yields errors on the root file system. In an attempt to fix this, I booted from a LiveCD - but fsck on the LiveCD instance doesn't find any errors at all. I also tried ...
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39 views

using testdisk to restore old superblock, cryptowall3.0 restoration

I have a drive that was infected with cryptowall3.0 Documentation states that the file is deleted and then from memory a new file is encrypted and that memory file is rename. Hypothetically restoring ...
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1answer
55 views

In centos6.x kvm guest, What is the difference On the following two disk format?

I add a new virtual hard drive vdb to the KVM guest(centos6.5),like this [root@centos ~]# fdisk -l | grep vdb Disk /dev/vdb: 8589 MB, 8589934592 bytes Then,there are two ways to format the disk a. ...
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51 views

Are zero byte files an indication of file system corruption?

I recently noticed a strange behaviour. I could not restart a productive webserver running since more than a year because the configuration was invalid: # /etc/init.d/apache2 restart Syntax error on ...
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3answers
140 views

Creative way to shrink a live ext4 filesystem from cloud provider?

When buying droplets, as DigitalOcean calls their cloud VM's, they are always configured with one large ext4 partition. I have an app that needs an LVM partition, so I need a creative way to shrink ...
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200 views

What does the mkfs.ext4 -G option do?

On Microsoft's Best Practices for running Linux on Hyper-V page it is recommended to use ext4 and not ext3 and "specify the number of groups to be 4096" using mkfs.ext4 –G 4096 /dev/sdX1. What is this ...
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my ext3 to ext4 dont work

my tools on centos 5.11 kernel - 3.2.69 util-linux-ng-2.17 ( mount 2.17 ) e2fsprogs-1.41.14 grub-1.97 this tool and kernel are all working my steps boot on recovery change the fstab ...
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Why is my VM disc file more than 2x bigger then the actual FS?

I'm having a VM with a small Debian 7 server inside a VMware Player VM. The Disc has a maximum size of 55 GB, the virtual machine properties show a current size of 46.5 GB. No other discs/volumes are ...
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61 views

Why is nfs server not seeing resized filesystem size?

On the NFS server, when I extend the the logical volume (using lvm2) and subsequently the ext4 fs on top of it (using resize2fs), I'm able to see the new size locally with df. But the NFS clients ...
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154 views

df is reporting wrong information in an LVM

I had a full disk usage on /var/log (100%) and deleted a few files to increase space. this is and ext4 partition mounted with default options. However, when I df -h I get: Filesystem ...
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108 views

Trouble creating ext4 filesystem when trying to mount EBS volume on AWS instance

I'm trying to mount an EBS volume on my AWS instance. Following Amazon's instructions, I get the following error when running sudo mkfs -t ext4 /dev/xvdf: Allocating group tables: done ...
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76 views

Why does /sys/fs/ext4/vda1 exist when /dev/vda1 is ext3?

I'm trying to tune my filesystem for some operations I have to do involving huge numbers of files. Then I got confused about what FS I'm even using. tune2fs -l /dev/vda1 contains: Filesystem magic ...
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131 views

Creating the exact size FS on xfs

I got a few hundred folders that I need to migrate to a new server. I've been asked to create a xfs FS for each individual folder. Ran a du so I know the exact size of each folder and specified block ...
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90 views

Alternative to ReiserFS for storing many small files in one block?

I know that ReiserFS is able to store multiple small files in a single block, and at one time was recommended for use with s3backer because of that feature, as fewer blocks to store on S3 mean lower ...
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72 views

mkfs.ext4 command not available in fedora 8

Is ext4 file system supported on fedora 8? If yes, then how do i enable it? I am unable to see format command for ext4. I can see only mkfs.ext3 and mkfs.ext2.
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190 views

Getting Error: “No space left on device” for a particular filename

I have a ext4 volume with lot of files inside a particular directory. Whenever I am trying to create a file inside it of a particular name, I am getting "No space left on device" error. $ touch ...
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117 views

Create KVM storage pool using a ext4 formatted drive

I have a secondary hdd that I would like to use as a storage pool for my KVM host. Here is the xml file I use to create the storage pool, <pool type='disk'> ...
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1answer
56 views

Shrinking LVM Volumes

We have a Synology RS3614rpxs NAS head containing (9) 3TB hard drives in a RAID 6 + 1 hot spare. The storage became exhausted and we added an expansion chassis where 5TB hard drivers were installed ...
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72 views

ddrescue — which files are in error locations?

I had a HDD crash and had to use ddrescue to restore it. It took a month, but it finally finished today. However, there were three errors that it could not read. Is there a way to find out which files ...
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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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4k 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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1answer
129 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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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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96 views

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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151 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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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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179 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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96 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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832 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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145 views

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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3k 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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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: ...