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Date:      Thu, 8 Apr 1999 00:09:55 +0200
From:      Ollivier Robert <roberto@keltia.freenix.fr>
To:        FreeBSD Hackers <hackers@FreeBSD.ORG>
Subject:   Re: Separate boot partition?
Message-ID:  <19990408000955.D8314@keltia.freenix.fr>
In-Reply-To: <19990407155835.M2142@lemis.com>; from Greg Lehey on Wed, Apr 07, 1999 at 03:58:35PM %2B0930
References:  <19990407085435.M2142@lemis.com> <19990407080113.A4122@keltia.freenix.fr> <19990407155835.M2142@lemis.com>

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According to Greg Lehey:
> Right, most System Vs I know with this method call it /stand.  But
> that name is taken :-)  On Tandem, the boot file system is (wait for
> it) bfs.  It's the most stupid file system I've seen yet, but it makes
> it easier for the bootstrap to find the kernel.

On SVR4 (at least some of the older 4.0 ones) used bfs as the filesystem
used for /stand. It is much simplier than UFS (contiguous allocation and
all that) and fits in the boot blocks.
 
> Well, you *could* tell me which parts are cool and why.  Then you'd
> have at least a hope of getting it.

It is something that for some parts is akind to vinum (mirror, raid and
all) with resizing of partitions (both VxfS and HFS). The LVM module from
AIX is even better because you don't need to unmount the filesystem before
(HP does it with an extra package called OnlineJFS).

You have Physical Volumes, grouped into Volume Groups, each Volume Group
is divided into Logical Volumes and a LV can contain a filesystem. A given
filesystem is extendable within a LV and you can enlarge a LV.

Probably near what Veritas' stuff does.
-- 
Ollivier ROBERT -=- FreeBSD: The Power to Serve! -=- roberto@keltia.freenix.fr
FreeBSD keltia.freenix.fr 4.0-CURRENT #70: Sat Feb 27 09:43:08 CET 1999



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