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

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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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0answers
570 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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1answer
108 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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1answer
168 views

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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3answers
341 views

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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1answer
1k 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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843 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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1answer
430 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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1answer
2k 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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2answers
499 views

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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1answer
505 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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4answers
551 views

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 ...
2
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4answers
3k 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 ...
0
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1answer
74 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 ...
11
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1answer
9k views

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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0answers
787 views

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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1answer
364 views

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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1answer
585 views

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 ...
0
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1answer
709 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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1answer
180 views

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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2answers
1k views

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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0answers
30 views

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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1answer
244 views

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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1answer
10k views

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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1answer
117 views

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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1answer
599 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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1answer
45 views

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?
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2answers
1k views

How to convert an HFS+ drive to EXT4 while retaining data? [closed]

Is there any direct way to convert an HFS+ drive to EXT4 and if so how? Was thinking maybe gParted? If not, I'll just copy contents off, reformat, copy back on. Just trying to avoid moving 2TB of ...
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1answer
187 views

Extending ext4 partition on debian7.0 on vsphere

I have allocated thin provisioning of 15GB when i found 8GB as insufficient. Now debian guest is not able to recognize the change of size. root@debian7-x64:~# lvdisplay --- Logical volume --- LV ...
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1answer
370 views

Ext4 cache options on a virtual machine

I'm trying to speed up a standup of virtual machines used for development / automated test environments and wanted to verify some assumptions about disk writes caching. I'm using ext4 for the root ...
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1answer
151 views

ext2 to ext4: Convert/upgrade or create new

We have a filesystem, on LVM, created as ext2 - and in daily use running 8-10 webservers (software, tempfiles, logfiles). The discs are "local" to the OS, but are really SAN disks provided to the ...
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1answer
582 views

Online resize of ext2 - Bug?

An ext2 filesystem can be resized - as long as the underlying block device can be resized - but not ONLINE. However, as another posting of mine has showed, if the ext2 filesystem is mounted as ext4 ...
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1answer
99 views

RAID5 Bad Superblock, not booting to OS

I've been running Ubuntu 12.04 LTS for about 6 months on a computer that has 3 180gb SSDs in EXT4 RAID5 configured through the motherboard's BIOS. The OS froze and computer had to be forced down. On ...
2
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1answer
342 views

ext4: Online resize not detected

On a RedHat 6 server, we ran into an issue with online resizing of an ext4 filesystem. With only /dev/sda we had 13GB available in the volume group, but needed 20GB more on one logical volume which ...
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1answer
52 views

Obtaining ext4 metadata

Is there any way of obtaining the following metadata on an ext4 filesystem? latest modified files files modified during a certain period largest file files within a size range
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1answer
145 views

Which directory hierarchy will be the best/fastest?

I have a pretty big directory with many cache files which I want to reorganise for max performance (access times). 2x 2TB SATA III drives, software RAID 1 (mirroring) OS: Ubuntu 12.04 LTS ...
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5answers
37k views

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 ...
0
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2answers
459 views

ext4 on faulty disks. How to avoid remount read-only?

The Problem: I'm in charge for a Hadoop cluster of 44 nodes. We have 1.5TB WD Green Drives with (quite unknown) the Load Cycle Count problem. These disks work fine but as they get older they show an ...
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2answers
762 views

Are ext4 RAID5 tuning options useful under LVM?

I'm setting up a system with a system with a mdadm RAID5 which is the sole PV for a VG which hosts 4 LVs. When I make the filesystem, would the mkfs.ext4 -E option be useful? Or is its effect not ...
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1answer
168 views

Inodes after extending filesystem

If I make a ext4 filesystem and add about 20% of extra inodes, how would this effect the inode count if later I extend the filesystem? Would the extended filesystem also automatically add an extra 20% ...
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1answer
760 views

Storing many small files with xattr in XFS and ext4

I have many small files (20 millions) with xattr on XFS drives. The average size of files is around 20KB and the average size of xattr is about 512 bytes. Because I would like to move them to ext4, I ...
2
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1answer
541 views

linux loopback remount-ro, ext4_da_writepages: jbd2_start: 8192 pages, ino 130135; err -30

I have a loopback device formatted with ext4 (^has_journal, disabled journalling). During shutdown, when I try to force remount as read-only, the loopback mounted filesystem. echo "u" > ...
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2answers
289 views

ext3 converted to ext4 still being mounted as ext3

I have a somewhat bizzare problem at the moment with my Debian-system (mainly testing). I used to have a root-partition on lvm that was formatted as ext3. I now booted a live-system and converted ...
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1answer
210 views

100% SSD usage Linux

Every 20-30 seconds my HDD usage goes to 100% (iostat). iotop is showing that [flush-8:0] is using 99% HDD during these times. In between HDD usage is 1-10%. iostat output: 04/22/2013 08:58:44 AM ...
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237 views

deleting files only frees space partially (ext3 / ext4)

I just did something similar to this: $ du -sh /bigdata/stuff 1022G /bigdata/stuff $ df -h /bigdata Fileystem Size Used Avail Used% mounted on /dev/sda5 1,8T 1,7T 140G 93% /bigdata $ rm ...
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1answer
59 views

Moved data from an ext4 volume to an ext3 volume and it is consuming more space, why?

Just need a simple answer, did some searching and couldn't find it. What is the metadata overhead with ext3 as compared to ext4? I migrated a number of volumes from a SAN that was using ext4 volumes ...
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1answer
118 views

Setup 1x RAID5 array with multiple LVs and differnt filesystems?

Centos 5.9 - 2.6.18-348.3.1.el5 i686 Raid5 - 4 Disks + 1 Spare (all WD RED 3TB) Does it make sence to create multiple LV within the same VP and configure them as differnt filesystems: Example: LV1: ...
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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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981 views

EXT4 performance has become really bad on system with lots of small files

I have a small embedded device that has only 128MB of RAM attached to this device is a 2TB USB2 hard disk I've been very happy with the performance of the device up until recently when either the ...
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2answers
1k views

Recovering a file with bad blocks in the middle

A large file on our ext4 file system may have picked up a bad block in the middle. Copying the file to another drive results in an input/output error part way through. Data beyond the bad sectors ...