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

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16k views

How do I remove a Read-only file system from a usb drive

During an ill-fated attempt to get tinycore linux to boot from a USB drive I managed to create a bunch of files that I now cannot remove. fortino@rebel:/media/working/boot/isolinux$ rm *.* rm: ...
3
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2answers
1k views

How many files can be saved in one directory on Linux? [duplicate]

Possible Duplicate: Number of files per directory I need to save 1 milion static html files in one directory as there is not possible to group the files into the directories (all files must ...
0
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2answers
128 views

where on the filesystem do user-generated system scripts go?

I have a couple command line php scripts and also php pages that call the same class file. Instead of having mutiple copies of it floating around, I want to put class.myApi.php in one central location ...
3
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1answer
986 views

Where can I see the last mount time?

E.g: I need to know when was the last time a pendrive was mounted. Where could I see that? The pendrive has e.g.: FAT32, EXT3 filesystem.
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5answers
5k views

Do journaling filesystems guarantee against corruption after a power failure?

I am asking this question on behalf of another user who raised the issue in the Ubuntu chat room. Do journaling filesystems guarantee that no corruption will occur if a power failure occurs? If this ...
26
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1answer
2k views

Why does “ls *” take so much longer than “ls”?

I have a couple of files in a directory: $ ls | wc -l 9376 Can anybody explain why there is such a huge time difference in using ls * and ls? $ time ls > /dev/null real 0m0.118s user ...
11
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3answers
9k views

How to change partition UUID (2 same UUID)?

I have a fedora guest OS in VMware. I want to expand /boot partition, so I add another virtual disk to this VM, and try to clone the disk. After dd if=/dev/sda1 of=/dev/sdb1, blkid report that ...
4
votes
1answer
2k views

What options are there for tuning Linux file system caching?

What various types of caching are possible in the ext3 file system and how can their values be changed using system calls or other methods? I don't want to use commands or tools.
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2answers
9k views

What mount points exist on a typical Linux system?

I have 2 questions. During Linux installation we specify memory space for 2 mount points - root and swap. Are there any other mount points created without the users notice? Is this statement ...
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vote
2answers
1k views

How can I fix linux disk without unmount it?

I had large file 200GB in my ext2 disk, then I deleted it(three are no files in Trash). And I haven't gained any free space. I don't want to use fsck as it requres me to unmount disk. I were windows ...
13
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3answers
2k views

How can I de-fragment a drive using Ubuntu?

Is it necessary to defrag drives in Ubuntu? If so, how do I do it and how often should it be done?
6
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1answer
845 views

How are extended attributes stored and preserved?

I have a small question about extended file attributes. Assume I label my files with metadata in extended attributes (e.g. to account for the integrity - but this does not matter for my question). The ...
4
votes
2answers
2k views

Determine file system timestamp accuracy

File timestamps accuracy is limited to one second for EXT3, one microsecond for UFS, and one nanosecond for EXT4 (at least according to experience). Is there any way to determine this based only on ...
21
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6answers
6k views

What's the most “correct” mount point for a permanent NTFS partition?

I have an NTFS partition (containing a Windows installation from which I dual boot) that I would like to permanently mount from my Linux installation. Problem is, I can't figure out what the ...
4
votes
2answers
522 views

How to synchronize a networked drive and an external drive (Ubuntu & OS X)?

In light of a recent hardware failure, I've decided that it's time to be a little less lax regarding back-ups. What I have: An Ubuntu 10.10 'server/NAS' A MacBook 5,2 A WD external HDD The server ...
41
votes
1answer
32k views

How do I find on which physical device a folder is located?

Specifically: I did sudo mkdir /work, and would like to verify it indeed sits on my harddrive and not mapped to some other drive. How do I check where this folder is physically located?
4
votes
3answers
980 views

When networkmanager is used, OpenSuSe gets stuck during boot for 10 minutes

I have this problem on all machines that I every installed (different configurations, different geographical locations, even different OpenSuSe versions) and it's extremely irritating. When I turn on ...
1
vote
2answers
194 views

about UFS allocation on FreeBSD

I am wondering what allocation method does UFS use? I know there are several options: contiguous, linked allocation and indexed allocation. Which one is for UFS?
3
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3answers
2k views

How much disk space should be allocated for FreeBSD?

I have a Samsung N150 netbook with 160 GB hard disk. I want to install FreeBSD OS. There will be no other OSs, no dual booting or like that, just FreeBSD. So the manual says to have a separate ...
4
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1answer
1k views

How can we customize linux file systems like ext2/3?

Actually IOzone is a filesystem benchmark tool. The benchmark generates and measures a variety of file operations like sequential reading/writing, random reading/writing. So I want to customize my own ...
5
votes
1answer
382 views

Problem on Linux NAND Root Filesystem

I'm have a JFFS2 root filesystem running on a large NAND device. Every once in a while, when I restart the computer, I get error messages about invalid ELF headers when /sbin/init or /bin/login try ...
3
votes
3answers
2k views

Really strange FAT32 file listing problem

I'm mounting a FAT32 drive on my NAS (which has a USB port), and hitting a strange issue when I use the ls command on the drive root: ls: cannot access ???²é?u.g: Input/output error ls: cannot ...
4
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3answers
2k views

How many bits is the access flags of a file?

How many bits on a linux file system is taken up for the permissions of a file?
3
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1answer
119 views

Is it safe to leave a enc folder mounted?

I was looking at this and ecryptfs seems cool. I'd like to use it on my server to encrypt git pushes. I dont want to ssh in everytime to mount/unmount the encrypted folder. However once in a while ...
9
votes
2answers
845 views

How to manage huge amount of files in shell?

$ ls ./dir_with_huge_amount_of_files/errors/ Suppose a directory is full of pictures with unix timestamps, I mean a lot measured in many GBs or even more. Shell-commands like ls will get ...
6
votes
2answers
959 views

Change file creation time on a FAT filesystem

I need a way to change the creation time of a file on a mounted FAT32 volume. I have to do that because my MP3 player will only read files sorted by this creation time. If I can find a way to set the ...
10
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2answers
4k views

Why is deleting files by name painfully slow and also exceptionally fast?

Faux pas: The "fast" method I mention below, is not 60 times faster than the slow one. It is 30 times faster. I'll blame the mistake on the hour (3AM is not my best time of day for clear thinking :).. ...
3
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1answer
158 views

Filesystem and journal layout

Is there any tools or some way in linux which can be used to view internals of filesystems ? How to view the inode related structures and journal ? and cached pages of files (pagecache).
18
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7answers
7k views

Linux equivalent to ReadyBoost?

Is there a kernel module or some other patch or something similar to Windows' ReadyBoost? Basically I'm looking for something that allows disk reads to be cached on a Flash drive.
39
votes
5answers
15k views

How can I create a /dev/null-like “blackhole” directory?

I would like to create a "/dev/null" directory (or a "blackhole" directory) such that any files written to it are not really written, but just disappear. I have an application that writes out large ...
6
votes
1answer
5k views

Modifying a squashfs,

Obviously I don't want to actually modify a squashfs. What I would like to do though is take an existing squashfs, a set of files and create a new squashfs which is identical to the old one except ...
3
votes
1answer
211 views

EXT3 file system pre digest material

I am looking for understanding EXT3 filesystem source code. I think I need a little pre-digestion to fully understand the code. Can anyone please suggest some material(blog etc.) where I can get some ...
152
votes
4answers
27k views

/usr/bin vs /usr/local/bin on Linux

Why are there so many places to put a binary in Linux? There are atleast these five: /bin/ /sbin/ /usr/bin/ /usr/local/bin/ /usr/local/sbin/ And on my office box, I do not have write permissions ...
3
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2answers
610 views

How to test file system correction done by fsck

How to make sure that fsck is correcting corruptions while keeping the integrity of file system? Suppose clients are writing lots of files through NFS to server, and there happens something that ...
12
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5answers
7k views

How to cache or otherwise speed up `du` summaries?

We have a large file system on which a full du (disk usage) summary takes over two minutes. I'd like to find a way to speed up a disk usage summary for arbitrary directories on that file system. For ...
7
votes
4answers
6k views

Is it possible in bash, to start reading a file from an arbitary byte count offset?

I want to locate a date which is somewhere in an 8 GB log (text). Can I somewhat bypass a full sequential read, and first do binary splits of the file (size), or somehow navigating the filesystem ...
6
votes
2answers
288 views

Allowing user to read only parts of NTFS filesystem

After installing ntfs-3g I have an option in nautilus to mount a Windows directory but I need to give root password. While I have no objection to giving root password I would prefer to be restricted ...
48
votes
4answers
38k views

Reserved space for root on a filesystem - why?

I understand that by default, newly created filesystems will be created with 5% of the space allocated for root. I also know you can change the defined space with: tune2fs -m 1 /dev/sdXY What I'm ...
2
votes
2answers
537 views

How many entries are created when you make a new directory in *nix?

As per the question, I am thinking mkdir ~/a is either two or three: 1 entry for the dir it sits in (~/a) 1 entry for itself (cd a && ls .) and/or 1 entry for itself again (cd a && ...
5
votes
2answers
323 views

Choosing the file system to use with LVM

Since I found out about LVM I have been giving more thought to the process for choosing the file system for my future installs. Usually I'd always choose whatever default option the distro would ...
11
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3answers
3k views

What file systems on Linux store the creation time?

Are there any (good known, reliable) file systems on Linux that store the creation time of files and directories in the i-node table? If there are, is the "changed" time replaced by the creation ...
5
votes
3answers
130 views

Network Filesystem + Local Access

I need to set up a network fs, so that I can mount a directory from Box A on to Box B and Box C. However, I need those files to not be transferred from Box A upon every access request; basically, I ...
1
vote
2answers
421 views

Swap root at runtime

I am developing an embedded Linux system. The system is usually installed by creating a ISO file which is written to a USB stick the board can boot from. To make the installation possible to do ...
0
votes
1answer
1k views

How to copy files nested in directories that match a pattern?

I'm looking to copy files from subdirectories that match this pattern vendor/plugin/*/tasks/*.rake into a folder lib/tasks I think that this could be done several ways, but wanted to see if a ...
1
vote
1answer
5k views

Where are the mount points defined in CentOS?

There is a mount point at /mnt/mountname and it goes to a large SAN with lots of storage but it's mounted as a read-only filesystem. I want to add a mount point with a different name that's ...
4
votes
3answers
401 views

What would be a good choice for an elastic file system (for adding storage at a later date)?

I'm currently running a Debian 6.0 server with EXT3, but I'd like to move over to Arch. It's being used as a file server right now with a 1TB drive in it (of which 650GB in it is used). What I'd like ...
2
votes
2answers
869 views

How to run e2image to backup a remote CentOS server?

Our server is hosted out of the country, I just have SSH access. I want to take an image backup of my server. I found the e2image utility to take an online backup of that server, but when I run ...
5
votes
1answer
296 views

Why do I need ntfs-3g when I have already enabled NTFS support in the kernel?

When configuring the kernel I see an option to add read-write support for NTFS. Then when mounting my NTFS partition I still have to install ntfs-3g and pass ntfs-3g as the type. I thought if I add ...
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2answers
338 views

How are directories managed in the filesystem?

On behalf of this particular question I would like to know how directories are managed in the file system. What does the author of the above question mean by telling each directory has n+2 ...
55
votes
3answers
2k views

Why does '/' have an '..' entry?

This just baffles me. Why does the root directory contain a reference to a parent directory? bob@bob:/$ ls -a . build home lib32 mnt .rpmdb sys vmlinuz .. cdrom ...