ext4 (fourth extended filesystem) is a journaling file system for Linux, developed as the successor to ext3.
2
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1answer
40 views
What does the command “chattr +c /some/dir/” do?
I'm trying to keep a bunch of plain text files compressed using the extended attribute option - c on a debian ppc64 system. I ran the following commands:
# mkfs.ext4 /dev/test/compressed
# mount ...
7
votes
1answer
73 views
How can I mount filesystems with > 4KB block sizes?
I have a 3TB hard disk pulled out of a WD Mybook Live NAS. The partition table is as follows:
Model: ATA WDC WD30EZRS-11J (scsi)
Disk /dev/sdb: 3001GB
Sector size (logical/physical): 512B/4096B
...
3
votes
3answers
53 views
Convert old /home from ext3 to ext4
I have an old /home partition, that dates back to former linux systems, and it is still in ext3 format. Whereas the rest of my system, / and some other mounted point are devices formated in ext4.
I ...
-2
votes
0answers
47 views
Debian Squeezy, ext4 fragmentation [closed]
I have dedicated MySQL server running on Debian Squeezy, and there is 200GB ext4 partition mounted as /var. At moment, there is only about 60GB of real data, but only 200MB of free space. So, I ...
0
votes
0answers
58 views
Linux 3.5 ext4 slow hdd performance?
This is a bit of a general question.
I have just installed Mint Linux 14.1, root is ext4 and rest are NTFS (dual boot).
I'm using a laptop, and I have always suffered from that annoying hdd ...
1
vote
2answers
44 views
Encrypted disk filesystem compatibilities
On my Debian Linux system during the install I decided to use disk encryption (the one offered during a regulard Debian install). When the system boots up I need to enter a password and then the ...
12
votes
2answers
270 views
Can the same ext4 disk be mounted from two hosts, one readonly?
I know that mounting the same disk with an ext4 filesystem from two different servers (it's an iSCSI vloume) will likely corrupt data on the disk. My question is will it make any difference if one of ...
1
vote
0answers
48 views
How can I delete data from in a hexdump file from one offset to another?
I've created a disk image which was zeroed, formatted to ext4 file system, and then had several various files copied to it.
I'm trying to extract these files using a combination of xxd and dd, but ...
4
votes
1answer
115 views
Is it possible to disable file permissions on a ext3 or ext4 file-system?
Is it possible to disable file permissions on an ext3/4 file-system?
Just wondering if it's possible to completely disable or ignore file permissions on a ext3 or ext4 file system. Perhaps a mounting ...
0
votes
2answers
502 views
Should a laptop user switch from ext4 to btrfs?
Related to this.
I'd like to take advantage of an OS switch to upgrade to BTRFS.
BTRFS claims to offer a lot (data-loss resiliency, self-healing if RAID, checksumming of metadata and data, ...
4
votes
2answers
257 views
Recovering an ext4 filesystem with corrupt journal
I have a hard drive that seems to have developed some kind of hardware problem in the journal. This prevents the drive from being loaded. Running mount -r -t ext4 /dev/sda5 /mnt/root results in the ...
0
votes
0answers
56 views
Missing operating system
Extlinux keeps saying Missing Operating System and I don't know what to do. I tried installing the Master Boot Record but it says Missing Operating System too. I have extlinux installed on my sd card.
...
1
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0answers
70 views
How to put syslinux on an sd card
I would like to know how to put syslinux on my sd card and I have tried using extlinux. However, I keep getting the message Missing Operating System. Please help me.
2
votes
1answer
67 views
How to write isolinux to an ext4 filesystem
How would I write isolinux to an ext4 filesystem on an 1 GB SD card so that it would boot at startup?
1
vote
1answer
71 views
Constant reading using ext4
I had a disk with a full size NTFS partition. I just deleted it and created an EXT4 one.
When it was NTFS, if it wasn't in use (mount but no in use) it was quiet. However now, using EXT4, it is ...
24
votes
6answers
2k views
How do I know if a partition is ext2, ext3, or ext4?
I just formatted stuff. One disk I format as ext2. The other I want to format as ext4. I want to test how they perform.
Now, how do I know the kind of file system in a partition?
2
votes
0answers
159 views
extundelete does not finish its work
I need to restore a file on sda7 so I remounted ro und startet extundelete
manuel@P5KC:~/recovery/RECOVERED_FILES$ sudo extundelete --restore-all /dev/sda7
WARNING: Extended attributes are not ...
4
votes
1answer
144 views
Why could the size of the “dot file” /. exceed 4096?
Today I found an "empty" directory with a size of 4MB.
It had no visible contents, so I tried ls -lah. This showed me some hidden files (not very large). Searching for the reason why the directory ...
2
votes
1answer
109 views
Why is some filesystem space used even though the filesystem is empty? [duplicate]
Possible Duplicate:
ext4: How to account for the filesystem space?
After googleing a little I find that ext4 reserve 5% for root: Reserved space for root on a filesystem - why?, ext2/3/4 ...
1
vote
2answers
5k views
Why ext4 File System is better than NTFS?
For a presentation, I need to show ext4 File System is better than NTFS. I searched and got nice article on both ext4 and NTFS
http://en.wikipedia.org/wiki/Ext4
http://en.wikipedia.org/wiki/NTFS
...
-2
votes
1answer
198 views
Extended partition should have many filesystems
I need some related information on the following lines I found in an answer:
A logical partition is a container for a filesystem (or an LVM volume or some swap space or a BSD partition or other ...
2
votes
1answer
142 views
How do I choose between ext 3 and 4?
I tried looking at the difference, the main ones seem to be 4 supports more subdirectories in a file, supports larger files, has delayed write which I don't prefer as I don't want data loss. I also ...
0
votes
1answer
898 views
Resize non-LVM ext4 root partition
How can I shrink/resize a non-LVM ext4 root partition?
The problem is I can't unmount it and I don't have physical access.
1
vote
3answers
422 views
Why does dd change the filesystem on the external disk?
I took out a 250 GB SATA disk from my netbook, filled it with zeroes with dd and connected it to my laptop via the usb adapter. It's correctly detected by fdisk:
Disk /dev/sdb: 250.1 GB, 250059350016 ...
4
votes
1answer
163 views
What are EXT4 Security Labels?
During Gentoo installation of Gnome keyring, I am told to switch on EXT4 Security Labels, which is described in the kernel documentation by:
Security labels support alternative access control ...
1
vote
1answer
75 views
What is a generic way of finding out whether the kernel has ext4 (or other) bugs?
From /. found this worrisome post by Theodore Ts'o. Turns out ext4 has some journalling problems. How can I quickly find out version numbers of susceptible kernels for this and other bugs?
3
votes
2answers
224 views
Fastest way to get list of all file sizes
I'm trying to create a graph of the distribution of file sizes on my ext4 system. I'm trying to write a script to scrape this information from my computer somehow. I don't care where the files are ...
0
votes
1answer
241 views
how to restore a logical partition to it's original ext4 format
This question is following Unable to mount /home/ partition after reinstalling grub after reinstalling windows 7 where the diagnostic was that installing windows 7 deleted my /home partion, lovingly ...
2
votes
1answer
576 views
Unable to mount /home/ partition after reinstalling grub after reinstalling windows 7
I've reinstall windows 7 on it's asignated partition and, as usually, it override the MBR with it's own stuff and, thus, it was not possible to boot to my ubuntu 12.04 partition.
I followed the step ...
4
votes
1answer
609 views
Birth is empty on ext4
I was just reading up on the Birth section of stat and it appears ext4 should support it, but even a file I just created leaves it empty.
~ % touch test ...
3
votes
3answers
294 views
A lot of errors on ext4, however smart doesn't show any errors
I have a Debian box with additional ( it is not a system disk ) 1.5Tb sata hdd (wd caviar green). There is only one partition on the whole disk.
Disk is used for backups from remote system (with ...
2
votes
1answer
175 views
How to fix a fragmented ext disk - myth or truth?
I just read this article about the virtually non-existent disk fragmentation on *nix filesystems.
It was mentioned that due to the way ext handles writing data to the disks, fragmentation may only ...
3
votes
1answer
168 views
corrupted library after hard shutdown
yesterday night my laptop executes a hard shutdown because my battery was out of charge. After the reboot Xorg hangs and the troubleshooting was pretty hard. A first file system check of my ext4 ...
3
votes
1answer
1k views
recovering ext4 partition after dd'ing over start of HD
I accidentally used dd and wrote over the first 208MB of my external disk. What I wrote over is a partition on its own (Debian nestinstaller) so what I see now is not my old (now damaged) ext4 ...
1
vote
0answers
163 views
Howto configure autofs to work with usbsticks formatted with differend filesystems
I have some USB-sticks using fat32 as filesystem and others using ext4. Now I want to configure autofs to mount the sticks automatically.
To make sure that the user can write to fat32 sticks I use ...
0
votes
0answers
31 views
Recreating EXT4 partition without losing data [duplicate]
Possible Duplicate:
Can't mount EXT4 hard drive after mounting it in windows
I have a 2TB Western External USB harddisk.
I formatted it to EXT4.
one time I plugged it to a windows ...
9
votes
2answers
898 views
Is it possible to change Inode count on an ext4 filesystem? [duplicate]
Possible Duplicate:
How can I increase the number of inodes in an ext4 filesystem?
I have a homemade NAS with Debian Wheezy 64bit. It has three disks - 2x2TB and 1.5TB, pooled together ...
3
votes
0answers
197 views
No access to symlink folder on NTFS partition
I am using an NTFS parition for storing data I like to access both from Ubuntu and Windows 7. On my Ubuntu HOME partition, I like to link the folder Assets in order to access it from an application ...
2
votes
1answer
566 views
Why my partitions don't show the right capacity on a 4096 byte physical block hard drive?
After reading a lot about why newer 4096 byte physical block hard drives should be partitioned taking care of alignment (Linux on 4KB-sector disks: Practical advice, What is partition alignment and ...
0
votes
1answer
949 views
File system jfs/btrfs/xfs/ext4
I was looking into some of the requirement, where huge amount of recursive files are written and deleted and looking forward if any FS (file system) as such gives advantage on others.
I am trying to ...
4
votes
1answer
103 views
ext4 directory lists as a file
I'm working with a large (8TB) EXT4 filesystem in linux. After a power outage, the filesystem wouldn't mount. fsck is taking weeks to complete, but i ran testdisk and i'm able to see my partition ...
2
votes
3answers
1k views
Can't mount EXT4 hard drive after mounting it in windows
I have a 2TB Western external HDD.
Its original filesystem was NTFS but I formatted it to EXT4.
I had no problem in Linux; But today after I mounted it using ext2fsd in a windows box, I cant mount it ...
5
votes
1answer
859 views
largefile feature at creating file-system
Is useful to use -T largefile flag at creating a file-system for a partition with big files like video, and audio in flac format?
I tested the same partition with that flag and without it, and using ...
2
votes
1answer
68 views
To use -c0 -io in file-systems with journal
I've several partitions with EXT4.
Now, I would want if it makes sense to use tune2fs with flags -c0 (max-mount-counts) and -i0 (interval-between-checks) in the partitions with a journal file-system ...
2
votes
0answers
124 views
How to limit ext4 filenames to only those filenames legal in FAT?
The ext4 filesystem allows some characters that FAT does not allow, such as :. This has caused me much grief in the past when trying to move files, especially as KDE will delete such files instead of ...
2
votes
1answer
326 views
Ext4 support in Grub 0.9X (legacy) and Grub 1.9X (Grub2)
I'm about to setup my new USB key with Grub or Grub2. In the old days I used ext2 for the boot partition.
I'm wondering if I could use ext4 for Grub2?
And if use Grub 0.9X, what about support of ...
5
votes
3answers
382 views
ext2/3/4 reserved blocks percentage purpose
I know that this feature dates back 20 years but I still would like to find out
What is the purpose of the reserved blocks in ext2/3/4 filesystems?
1
vote
1answer
2k views
How can I shrink a LUKS partition, what does `cryptsetup resize` do?
I am in progress of resizing a LUKS encrypted partition that contains a single ext4 filesystem (no LVM or something). The cryptsetup FAQ recommends to remove the old partition and recreate it, but ...
2
votes
1answer
2k views
How do I determine the new size for resize2fs?
I want to shrink an ext4 filesystem to make room for a new partition and came across the resize2fs program. The command looks like this:
resize2fs -p /dev/mapper/ExistingExt4 $size
How should I ...
0
votes
2answers
403 views
Keep ext4 journal on another system, how much space would be necessary?
I'm going to move journal to another partition, but I don't know how to correctly caculate the size needed for journal?
I'm running ext4 file system with 15GB capacity.
