View source for ODS-2

'''ODS-2''', or '''On-Disk Structure-2''', is a [[Files-11]] file system. This is the most widely used file system on OpenVMS; system disks can only be ODS-2. The most notable feature of this system as compared to the other most widely used one, [[ODS-5]], is that it is not case-sensitive or case-preserving, and that it does not support hard links.

ODS-2 is used to share data between [[VAX]] and [[Alpha]] with full compatibility.

Here is what an ODS-2 disk looks like:

 <nowiki>
$ sh dev dka0: /full

Disk SMAN01$DKA0:, device type RZ73, is online, mounted, file-oriented device,
    shareable, available to cluster, error logging is enabled.

    Error count                    0    Operations completed               8514
    Owner process                 ""    Owner UIC                      [SYSTEM]
    Owner process ID        00000000    Dev Prot            S:RWPL,O:RWPL,G:R,W
    Reference count               94    Default buffer size                 512
    Total blocks             3907911    Sectors per track                     7
<...>

  Volume Status:  ODS-2, subject to mount verification, protected subsystems
      enabled, file high-water marking, write-through XFC caching enabled,
      write-through XQP caching enabled.
 </nowiki>

=File Name Restrictions=
ODS-2 supports the following character set:
* A-Z
* 9-0
* hyphen (-)
* dollar sign ($)
* underscore (_)

The maximum length of file names and extensions is 39 characters.

=See also=
* {{Template:Fap}}
* {{Template:SysmanI}}