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Date:      Wed, 7 Apr 1999 08:14:48 -0400
From:      Keith Stevenson <k.stevenson@louisville.edu>
To:        freebsd-hackers@freebsd.org
Subject:   Re: Separate boot partition?
Message-ID:  <19990407081448.A28786@homer.louisville.edu>
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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On Wed, Apr 07, 1999 at 03:58:35PM +0930, Greg Lehey wrote:
> On Wednesday,  7 April 1999 at  8:01:13 +0200, Ollivier Robert wrote:
> >
> > HP-UX uses a similar scheme with /stand/vmunix (and /stand/system for tuned
> > parameters). /stand is always an HFS (aka UFS) whereas all the other FS can
> > be VxFS.
> 
> 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.

With LVM on AIX, the boot "device" isn't even mounted at run time.  If you do
anything with the root LVM configuration, you have to update the system boot
blocks, but otherwise you'd never know that the boot device even exists.
In the case of an extended vinum, would it even be necessary for the boot 
device to be mounted after the system is running?

As for the various commercial LVMs, I've used LVM under both HPUX and AIX.  In
my opinion, AIX's implementation is far superior.  The ability to increase the
size of a mounted filesystem is extremely powerful.  AIX's LVM also seems more
robust than HPUX's.

Regards,
--Keith Stevenson--

-- 
Keith Stevenson
System Programmer - Data Center Services - University of Louisville
k.stevenson@louisville.edu
PGP key fingerprint =  4B 29 A8 95 A8 82 EA A2  29 CE 68 DE FC EE B6 A0


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