Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!cs.utexas.edu!uunet!comp.vuw.ac.nz!actrix!paul
From: paul@actrix.gen.nz (Paul Gillingwater)
Newsgroups: comp.unix.internals
Subject: Re: holes in files
Message-ID: <1990Dec28.231158.17497@actrix.gen.nz>
Date: 28 Dec 90 23:11:58 GMT
References: <11749@alice.att.com> <1990Dec26.190535.25820@Think.COM> <11753@alice.att.com>
Organization: Actrix Information Exchange
Lines: 16
Comment-To: andrew@alice.att.com

In article <11753@alice.att.com> andrew@alice.att.com (Andrew Hume) writes:
> 	i am on the ansi committee working on worm fs standards and
> the problem of reserving space on worms is understood and provided for.
> It is a little moot how you can do it with vanilla unix but at the file
> system driver level, you can allocate arbitrary (well, limited by 2^64 bytes
> and the world's production of media) extents for future use. presumably
> clever vendors will add ioctl's or fcntl's to do such.

For a very good discussion on these matters, go along to your local
HP office, and ask for a copy of the HP Journal.  The latest edition
goes into great detail about their new Optical R/W auto-changer
(juke box) and has an excellent discussion on how they implemented
things under a UNIX (HP-UX McKusick) file system.

-- 
Paul Gillingwater, paul@actrix.gen.nz