Martinv at 12:38, 16 December 2025

2025-12-16T12:38:14Z

← Older revision		Revision as of 12:38, 16 December 2025
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			[[Category:Volume Management]]

Darya.zelenina: Created page with "'''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..."

2019-03-31T10:00:29Z

Created page with "'''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..."

New page

'''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}}

ODS-2 - Revision history

Martinv at 12:38, 16 December 2025

Darya.zelenina: Created page with "'''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..."