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A disk quota is a limit set by a system administrator that restricts certain aspects of file system usage on modern operating systems. The term system administrator, abbreviated sysadmin, designates an employment position of those people responsible for running technically advanced information systems or some aspect of them. ...
In computing, a file system is a method for storing and organizing computer files and the data they contain to make it easy to find and access them. ...
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Types of quotas
There are two basic types of disk quotas. The first, known as a usage quota or block quota, limits the amount of disk space that can be used. The second, known as a file quota or inode quota, limits the number of files and directories that can be created.
In addition, administrators usually define a warning level, or soft quota, at which users are informed they are nearing their limit, that is less than the effective limit, or hard quota. There may also be a small grace interval, which allows users to temporarily violate their quotas by certain amounts if necessary.
Quota specification Disk quotas are typically implemented on a per-user or per-group basis. That is, a system administrator defines a usage or file quota specific to a certain user or group. The term system administrator, abbreviated sysadmin, designates an employment position of those people responsible for running technically advanced information systems or some aspect of them. ...
In doing so, an administrator can prevent one user from consuming an entire file system's resources, or create a system of tiered access, whereby users can have different levels of restriction. This is used, for example, by web hosting companies to provide different levels of service based upon the needs and means of individual clients. Web hosting is a service that provides individuals, organizations and users with online systems for storing information, images, video, or any content accessible via the Web. ...
In most cases, quotas are also specific to individual file systems. Should an administrator want to limit the usage of a specific user on all file systems, a separate quota would have to be specified on each.
Quota violation When a soft quota is violated, the system normally sends the user (and sometimes the administrator as well) some sort of message. No further action is typically taken.
Some systems prevent disk write operations that would result in hard quota violations from completing successfully, while others wait until the quota has been physically violated before denying write requests. The user is typically notified through the failed write operation error messages generated by the violating applications, while the administrator is almost always sent a notification as well.
Administering quotas
 Quota Management on Windows 2000 Disk quotas are supported by most modern operating systems, including Unix-like systems (AIX, Linux), Microsoft Windows starting with Windows 2000, Novell NetWare, VMS, and others. The method of administration for disk quotas varies between each of these operating systems. Unix-like systems typically provide a quota command for both administration and monitoring; graphical front-ends to the command may also be used. Windows 2000 and newer versions use the "Quota" tab of the disk properties dialog. Other systems provide their own quota management utilities. A screenshot of the Windows NT Quota Management properties page. ...
A screenshot of the Windows NT Quota Management properties page. ...
A Unix-like operating system is one that behaves in a manner similar to a Unix system, while not necessarily conforming to or being certified to any version of the Single UNIX Specification. ...
AIX or Aix may be: Aix, a genus of two species of dabbling ducks, the Wood Duck (Aix sponsa) and the Mandarin Duck (Aix galericulata) AIX operating system Athens Internet Exchange, (AIX) a European IXP a place name: Aix-la-Chapelle, or Aachen, a city in Germany in France: Aix...
Linux (also known as GNU/Linux) is a Unix-like computer operating system. ...
Microsoft Windows is a family of operating systems by Microsoft. ...
Windows 2000 (also referred to as Win2K) is a preemptible, interruptible, graphical and business-oriented operating system that is designed to work with either uniprocessor or symmetric multi-processor 32-bit Intel x86 computers. ...
NetWare is a network operating system developed by Novell, Inc. ...
OpenVMS (Open Virtual Memory System or just VMS) is the name of a high-end computer server operating system that runs on the VAX and Alpha family of computers developed by Digital Equipment Corporation of Maynard, Massachusetts (now owned by Hewlett-Packard), and more recently on Hewlett-Packard systems built...
See also In computing, a file system is a method for storing and organizing computer files and the data they contain to make it easy to find and access them. ...
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