The Vinum Volume Manager
     The Vinum Volume Manager is a block device driver which implements virtual disk drives. It isolates disk hardware from the block device interface and maps data in ways which result in an increase in flexibility, performance and reliability compared to the traditional slice view of disk storage. Vinum implements the RAID-0, RAID-1 and RAID-5 models, both individually and in combination. Vinum is part of the base distribution of the FreeBSD operating system. Versions exist for NetBSD and OpenBSD.

This site contains the following information about Vinum:

Known bugs in Vinum
What to do with Problems in Vinum
How to Replace a Failed Drive
Performance Issues
Increased Resilience
Some Examples
The Big Picture

Brief introduction to Vinum
Full Introduction
Object Naming
Three Problems
Driver Structure
Vinum feature wish list
Current Implementations
Future Directions

FreeBSD and NetBSD source trees. This site contains the RCS versions of the
super-source which includes code for both hidden behind #ifdefs. It uses some very flaky code in a Makefile to trim it to the code in the individual trees. This would be the best code to use to start a new port. If anybody wants to tidy up the Makefile for stripping the #ifdefs, please do so.

I also have some
notes on the structure of the driver. Don't count on these being up to date, but they might help.


Vinum is documented in the man pages vinum(4) (the driver) and vinum(8) (the control program). These man pages are being continually updated, so the version you have will probably not be as up-to-date as the ones below. Beware, however: these man pages refer to the development version of Vinum in the -CURRENT version of FreeBSD, which may not correspond to the version you are running. In particular, FreeBSD 4.0 removes block devices, which has changed some aspects of the way Vinum works.

Man page vinum(4) in readable format
Man page vinum(8) in readable format
Man page vinum(4) in PostScript, for printing.
Man page vinum(8) in PostScript, for printing.
Introduction to Vinum in Postscript form.
Bootstrapping Vinum, by Bob Van Valzah
Vinum chapter from the fourth edition of
The Complete FreeBSD in PDF and text form.

For Microsoft users

The best choice of format is PostScript, since many printers process it directly. Microsoft does not support PostScript, however. If you have the misfortune to have to use Microsoft, you can download the following PDF files. You'll need Acrobat software to process it.

Man page
vinum(4) in PDF, for Microsoft.
Man page
vinum(8) in PDF, for Microsoft.

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For legal purposes this site is to be taken as is and is not responsible for anything regarding vinum volume manager or any other volume manager or any computer related software/hardware.