A filesystem is a way to organize and store computer files with their data.

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What does the CONFIG_NLS_UTF8 kernel option do?

The kernel configuration contains an NLS_UTF8 option. It can be found under File systems → Native language support. What does it do? Its description maintains that it is needed for using a FAT or ...
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5k views

On the Fly Compression for a Directory

I have a directory that is always going to be storing text files that are rarely (think weekly) used. Naturally this is a great place to use compression. However, rather than having to use tar ever ...
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91 views

'tie' [nonexisting] files to programs

Recently, I just had an idea which turned out to be pretty useful under certain circumstances. But first some simple explanation: In Perl, you have the option to tie variables to some functions ...
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Must the filesystem be unmounted while extending an LVM logical volume?

I have seen some tutorials on extending an LVM2 logical volume. None of them instruct you to unmount the filesystem. They claim that you can extend an LVM volume while it is in use. Is this right?
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zfs one pool error

I have zpool with name zroot and zroot has 4 pool when electricity down system reboots and than i saw some error with 1 pool: Solaris: Warning: can`t open object for zroot/var/crash log_sysevent: ...
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Removing files that do not exist

I apologize for the possibly misleading title, but it is the best way I could think of to describe the problem, which is: I have several files that I can cat, but when I try to rm them I get a "No ...
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1answer
463 views

Can I read and write to alternate HFS+ file forks or NTFS data streams from Linux?

It's possible to mount both Apple HFS+ and Microsoft NTFS filesystems under Linux. Both filesystems support multiple content streams per file, though this is not widely used. Apple uses the term ...
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1answer
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Trigger action each time a file is modified [duplicate]

Possible Duplicate: Can a bash script be hooked to a file? Is it possible to mount a mechanism to a file to perform an action (e.g. mark the change in some log file and such) each time the ...
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1answer
476 views

File permission mechanism in Unix like systems

Can some one please explain with a an example the file permission mechanism in Linux and other Unix like systems ? What are the nine bits for ? Why do we have a group id for a user as well as for a ...
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1answer
2k views

convert /dev/md0 to /dev/sda1

I used a Software-RAID I and want to access the data without RAID now. After mdadm --fail /dev/md0 /dev/sda1 mdadm --remove /dev/md0 /dev/sda1 I tried mount -t ext4 /dev/sda1 /mnt but dmesg ...
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Sphinx Search shutting down after `FATAL: accept() failed: Too many open files`

I'm running Sphinx Search Server V2.06 ( the latest stable release ) on an Amazon EC2 with Linux CentOS. In general it is running fine, but the searchd.log is showing this error over and over with ...
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616 views

Any command to view the file system internal fragmentation size under a directory?

If the block size of a file system is 4KB, then for a 1KB file, 3KB space(which is internal fragmentation) is wasted. So, under a directory, is there any command to summarize how much disk space is ...
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What causes /dev/disk/by-label to be populated?

I've noticed that Linux distributions typically have a /dev/disk/by-label directory, but this isn't always the case (For example, the CirrOS Linux test image doesn't have one). What's required on a ...
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1k 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 ...
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1answer
599 views

Read/write access on raw NTFS image

I backed up an entire 32GB NTFS partition to a raw image with with dd. The file-system on the partition in accessible under Debian after mounting with: $ sudo mount -o ro,loop ...
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1answer
235 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 ...
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607 views

Negative hdd usage. Available is larger than fullsize

Having issues with space accounting of lvm volume. 23G is available. But the full size of the partition is 20G. (So, it shows "-4.1G used" 0_O) > df -h Filesystem Size Used Avail Use% ...
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365 views

What filesystems preferentially reuse blocks from deleted files?

Related to this earlier question I asked, I'd like to know what filesystems will preferentially reuse blocks that are freed when files are deleted (if any exist)? I am only interested in stable, ...
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2answers
2k views

Is there an excellent tutorial on how to resize a rootfs partition (and shrink another) on a drive that is 100% allocated?

I'm experiencing the all-too-common "root partition full" situation. 100% of my hard drive is allocated. My home (ext4) partition has plenty of space to give up for my full root partition (rootfs). ...
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1answer
211 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 ...
47
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1answer
103k views

How to determine the filesystem of an unmounted device? [duplicate]

Possible Duplicate: Find filesystem of a partition from a script How to show the filesystem type via the terminal? I'm looking for a command that yields the filesystem type as mount would ...
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1answer
287 views

Unix and Linux without a file system?

I was reading Eric Raymond's the Art of Unix Programming, (Amazon and online) and at the very beginning of the book where he analyses what Unix does wrong he says: Having a file system at all may ...
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How to show the filesystem type via the terminal? [duplicate]

Possible Duplicate: How to tell what type of filesystem you’re on? Find filesystem of an unmounted partition from a script How can I quickly check the filesystem of the partition? Can I ...
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3answers
983 views

Disk size management

I am using Fedora 16. My /dev/sda2, mounted on / (root) with something like 50G got filled 100%: [foampile@~ 13:13:39]> df Filesystem 1K-blocks Used Available Use% Mounted on rootfs ...
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467 views

About sector and blocks, and a little confusion in /proc/diskstats

I've been studying about diskstats lately, and I get that the amount of hdd read comes in sectors. But in most places I've noticed that there exists a slight misunderstanding about sectors and blocks. ...
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1answer
4k views

cannot 'ls' /mnt directory

I have a CentOS-6 machine that I'm working on that is running a live database. It's having a problem with the /mnt directory. I cannot ls the directory for some reason. stat is working and shows ...
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303 views

Unable to access Linux share from a Windows machine with NT_STATUS_BAD_NETWORK_NAME error

On the Linux machine I changed the smb.conf like this: [john] path = /root/john/downloads available = yes valid users = john read only = no browsable = yes public = yes writable = yes The path ...
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1answer
129 views

Filesystem writes seemingly lost

I've been experimenting with tcpdump, and I've found some very bizarre filesystem behavior. It doesn't look to be a tcpdump problem as I'll explain in a second. The following command produces no ...
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1answer
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Does using lvextend destroy data already on the volume?

Does resizing a logical volume with lvextend and e2resize destroy data already on the volume? See also this related unanswered question and some examples of the process: Can I resize the root ...
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Difference between “chmod 775” and “chmod 2755”

What is the difference between "chmod 775" and "chmod 2755"?
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256 views

du command show a slash after directories?

How to use du command show a slash after directories? For example: du -ab /root/test/php-5.4.8/ Result: 1781 /root/test/php-5.4.8/main/internal_functions.c.in 973596 ...
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3answers
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What logs would be written if file system is full in UNIX?

I am working on a unix server and I guess during some time in past the file system had been full. However, I need some solid data to prove it. Will there be any OS logs or something of that sort to ...
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Automatically change file permission upon write to a folder

How can I create directories so: /data /data/user1 /data/user2 and make sure that whenever root writes inside them, depending on which directory it writes to, different owners are set. Example: ...
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1answer
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How to unlock read-only filesystem on OpenWRT router linux distribution?

I have installed minimal OpenWRT firmware on Linksys router. When I try to modify some of the files withing /etc/ directory for example firewall.user file by using command vi firewall.user it opens ...
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2answers
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Filesystem type on Solaris 5.10

How can I get the file system type for each device on Solaris 5.10? I tried mount with no args but that only listed each mount point, similar to df. Also, how can I find where a specific directory ...
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What happens when you delete a hard link?

If you do rm myFile where myFile is a hard link, what happens?
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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 ...
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993 views

How to create low-overhead file system

I have usb keychain with size of 7.5GB and I need to copy file on it with size 7.4GB. But I can't because superblocks consume 0.5GB of space.
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Effectivity of shred on different file systems

man shred warns that the command is not useful on file systems that don't overwrite in-place. I don't have much knowledge about the current and upcoming file systems, but I would suspect that many of ...
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1answer
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/ permissions on a linux filesystem

Does the / have permissions attached to it? If so what are they and what command do you run to find out? The reason why I ask this is to know weather a NFS mount reflect this if your export is set to ...
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600 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 ...
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2answers
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Are there widespread filesystems which represent directories with structures optimized for fast lookup?

In "The Art of Unix Programming", on the topic of The Terminfo Database I read: If you look in the terminfo directory, you'll see subdirectories named by single printable characters. Under each ...
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2answers
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Cannot access disk, partition table broken

I was so dumb, to turn of the power on my Readynas Ultra 4 when it was installing the disk (3TB WD Green), I had no time to wait for it as I was going to return it (It was to damn noisy) The disk ...
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1answer
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What is Linux doing differently that allows me to remove/replace files where Windows would complain the file is currently in use?

The example I have is Minecraft. When running Bukkit on Linux I can remove or update the .jar files in the /plugins folder and simply run the 'reload' command. In Windows, I have to take the whole ...
2
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1answer
499 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 ...
5
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1answer
1k views

Automount not equivelent to mount?

I'm struggling to get automount to work as desired. If I run the following: sudo mount -t nfs server:/path/to/share /path/to/mount_point I get the mount appearing fine. However, if I add the ...
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Does the filesystem influence flash drive speed?

I'm currently filling up an empty 16GB flash drive which gives me a lot of time for imponderables. It's formatted as fat32 or whatever it came with (and I'll probably leave it that way for ease of ...
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Why do I get 3048 MB from a 64 MB flash memory?

I have a Linux based STB (set-top-box) and it features a 64 MB flash memory and 256 MB of RAM. I wanted to take a backup of some of my settings before I flash it with another image, but I wasn't sure ...
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I want to modify root files while also being able to create non-root files in a single text editor session.

Catch 22: If I open my text editor without using sudo, I don't have permission to save any changes. If I open it with root privileges, any files I create are owned by root. I want to be able to ...
2
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1answer
877 views

remove unallocated space from a partition image

I have just created an image of an sd card using dd and the image is compressing down less than expected. I suspect this is because the card had not been zeroed out before I started to make the image. ...