![]() ![]() when some applications or users should have read-only access) an alternate path (so it’s like a shortcut) ![]() You could use a Name File System to set up a directory with: With a NameFS you can create a second path and you don't have to change permissions, copy, move, rename or even touch the original file system. The file is organized into stanza names that are file system names and contents that are attribute-value pairs specifying characteristics of the file system.Ī NameFS is a pseudo-file system that lets you access a directory through two different path names. Most of the file system maintenance commands take their defaults from this file. proc /proc (pseudo fs kept in memory to support threads)Īll of the information about the file system is centralized in the /etc/filesystems file. Hd9var /var (variable spool and log files) Hd4 / (critical files for system operations, programs that complete the boot process) Hd2 /usr (operating system commands, libraries and application programs) Logical Volume File System or Description Each of these file systems is always associated Standard file systems in AIX Versions 5 and higher are /, /home, /usr, NFS Network File System accessed across a networkĪHAFS Autonomic Health Advisor File System SMBFS Server Message Block Filesystem (cifs_fs, samba share) UDF Universal Disk Format (DVD ROM media) JFS2 Enhanced Journaled File System which exists within a Logical Volume on diskĬDRFS CD-ROM File System on a Compact Disc JFS Journaled File System which exists within a Logical Volume on disk You can access both local and remote file systems using the mount command. When a file system is mounted, the logical volume and its contents are connected to a directory in the hierarchical tree structure. For example, you can back up, move, or secure an entire file system.įile systems are associated with devices (logical volumes) represented by special files in /dev. Some tasks are performed more efficiently on a file system than on each directory within the file system. As long as these layers all support the common service calls, any format of media and content on that media will be allowed by the OS.A file system is a hierarchical tree structure of files and directories. All you need is a media driver for the specific physical device and a file system manager for the physical format of the contents of the media. e.g.: each read more than requested in anticipation of another read.īy having multiple layers like this, you can have any (physical) file system and/or media device you wish and the OS would be none the wiser. Please note that any or all could have a working cache manager which means calls are processed and returned without calling lower layers. When a call to read a file is made, the app (1) calls the OS File manager (2), which in turn-due to the opening of the file-calls the correct OS File System Manager (3), which then calls the Specific File System Driver (4), which then calls the Media Device Driver (5) for the actual access. OS File System Manager (allowing multiple file systems).Here is a (simple) list of layers that might be used from top down. With this in mind, there are at least two layers, usually more, of management between the file being viewed and the file on the physical media. Therefore, an OS can be completely independent of how the file was stored on the media. At the same time, a media device must contain a specific type of storage format to contain files and folders, and at the same time be Operating System independent.įor example, an OS should be able to handle any file locally, allowing the actual transfer of these files from physical media to the OS (and visa-versa) to be managed by the file system manager. i.e.: It should not matter what type of storage format a given media device contains. A modern Operating System, to be portable, must be file system independent. ![]()
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