From owner-freebsd-hackers Wed Apr 7 2:56: 6 1999 Delivered-To: freebsd-hackers@freebsd.org Received: from peach.ocn.ne.jp (peach.ocn.ne.jp [210.145.254.87]) by hub.freebsd.org (Postfix) with ESMTP id C67A614D12 for ; Wed, 7 Apr 1999 02:56:04 -0700 (PDT) (envelope-from dcs@newsguy.com) Received: from newsguy.com by peach.ocn.ne.jp (8.9.1a/OCN) id SAA23410; Wed, 7 Apr 1999 18:53:31 +0900 (JST) Message-ID: <370B2A1B.BA8877D6@newsguy.com> Date: Wed, 07 Apr 1999 18:49:15 +0900 From: "Daniel C. Sobral" X-Mailer: Mozilla 4.51 [en] (Win98; I) X-Accept-Language: pt-BR,ja MIME-Version: 1.0 To: Greg Lehey Cc: Ollivier Robert , FreeBSD Hackers Subject: Re: Separate boot partition? References: <19990407085435.M2142@lemis.com> <19990407080113.A4122@keltia.freenix.fr> <19990407155835.M2142@lemis.com> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Content-Transfer-Encoding: 7bit Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Greg Lehey wrote: > > > Speaking of HP, their LVM system is cool. Now, that would be a nice > > addition to vinum (please don't look at me, I'm not a FS expert). > > Well, you *could* tell me which parts are cool and why. Then you'd > have at least a hope of getting it. It's like AIX LVM... I sent you a message describing AIX LVM once. There are three features really worth in them. First, the Logical Volume is a set of Physical Volumes (VINUM does that). Second, you allocate partitions in the logical volumes through bitmaps of LPs (sectors/clusters/blocks/whatever you want to call it) instead of ranges. Third, you can increase logical volumes or partitions at any time. Then, there is the volume group stuff, which is a minor point. The problem is that the underlying filesystem would need to support dynamic size increase. BTW, I recall that you need to unmount the fs in HP-UX, while AIX supports increasing the logical volume (and underlying filesystem) without unmounting it. Anyway, if you can't increase the size of a filesystem, even having to unmount it, the other benefits of a LVM over Vinum are greatly diminished. I have worked with both, and AIX one is much superior. -- Daniel C. Sobral (8-DCS) dcs@newsguy.com dcs@freebsd.org "nothing better than the ability to perform cunning linguistics" To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message