10 articles tagged "linux filesystem"

How To Measure Linux Filesystem I/O Performance With iozone
IOzone is a filesystem benchmark tool. The benchmark generates and measures a variety of file operations. Iozone has been ported to many systems and runs under many operating systems including Windows, UNIX, Linux and BSD. This article gives you a jumpstart on performing benchmark on filesystem using iozone a free Filesystem Benchmark utility under Linux.
Mount a Linux filesystem on a SAN from multiple nodes at the same time
If you try to mount an ext3 Linux filesystem on a SAN from multiple nodes at the same time you will be in serious deep trouble.
SAN based storage allows multiple nodes to connect to same devices at the same time. Ext3/2 are not cluster aware file system. They can lead to a disaster such as [...]
Why isn’t it possible to create hard links across file system boundaries?
A single inode number use to represent file in each file system. All hard links based upon inode number.
So linking across file system will lead into confusing references for UNIX or Linux. For example, consider following scenario
* File system: /home
* Directory: /home/vivek
* Hard link: /home/vivek/file2
* Original file: /home/vivek/file1
Now you create a hard link as [...]
Understanding UNIX / Linux symbolic (soft) and hard links
Inodes are associated with precisely one directory entry at a time. However, with hard links it is possible to associate multiple directory entries with a single inode. To create a hard link use ln command:
# ln /root/file1 /root/file2
# ls -l
Above commands create a link to file1.
Hard link vs. Soft link in Linux or UNIX

Hard [...]
How to: Linux / UNIX Delete or Remove Files With Inode Number
An inode identifies the file and its attributes such as file size, owner, and so on. A unique inode number within the file system identifies each inode. But, why to delete file by an inode number? Sure, you can use rm command to delete file. Sometime accidentally you creates filename with control characters or characters [...]
How Do I Make Linux / UNIX Filesystem Backup With dd?

Explains how to make a backup (track by track) using dd command under UNIX / Linux operating system.
Understanding UNIX / Linux filesystem directories
You use DNS (domain name system) to translate between domain names and IP addresses.
Similarly files are referred by file name, not by inode number. So what is the purpose of a directory? You can groups the files according to your usage. For example all configuration files are stored under /etc directory. So the purpose [...]
Understanding UNIX / Linux filesystem Inodes

An inode is a data structure on a traditional Unix-style file system such as UFS or ext3. An inode stores basic information about a regular file, directory, or other file system object.
Understanding UNIX / Linux filesystem Superblock
This is second part of “Understanding UNIX/Linux file system”, part I is here. Let us take an example of 20 GB hard disk. The entire disk space subdivided into multiple file system blocks. And blocks used for what?
Unix / Linux filesystem blocks
The blocks used for two different purpose:

Most blocks stores user data aka files [...]
Understanding UNIX / Linux file system
A conceptual understanding of file system, especially data structure and related terms will help you become a successful system administrator. I have seen many new Linux system administrator w/o any clue about file system. The conceptual knowledge can be applied to restore file system in an emergency situation.
What is a File?
File are collection of data [...]