From owner-freebsd-scsi@FreeBSD.ORG Wed May 14 16:16:47 2003 Return-Path: Delivered-To: freebsd-scsi@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 800BE37B401 for ; Wed, 14 May 2003 16:16:47 -0700 (PDT) Received: from rootlabs.com (root.org [67.118.192.226]) by mx1.FreeBSD.org (Postfix) with SMTP id 0AB9E43FA3 for ; Wed, 14 May 2003 16:16:47 -0700 (PDT) (envelope-from nate@rootlabs.com) Received: (qmail 79475 invoked by uid 1000); 14 May 2003 23:16:48 -0000 Date: Wed, 14 May 2003 16:16:48 -0700 (PDT) From: Nate Lawson To: Scott Long In-Reply-To: <3EC2CBD0.3020102@btc.adaptec.com> Message-ID: <20030514161256.N79399@root.org> References: <20030514151752.B79363@root.org> <3EC2CBD0.3020102@btc.adaptec.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII cc: scsi@freebsd.org Subject: Re: SCSI geometry calculation? X-BeenThere: freebsd-scsi@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: SCSI subsystem List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 14 May 2003 23:16:47 -0000 On Wed, 14 May 2003, Scott Long wrote: > > Most drivers use >1G: 255/63, else 64/32. Exceptions are: > > * aac - >=2G: 255/63, >=1G 128/32, else 64/32 > > * aha - same > > * bt - same as aha Why are aha and bt using an extra 2G step instead of the normal 1G step? They're not RAID controllers. Did you use that geometry for aac intentionally or was it just a cut/paste? > I'm really not sure what to say > about the boundary cases other than if they are buggy, few people > notice. Would it be ok to move them all to > and not use >=? -Nate