From owner-freebsd-questions Mon Apr 21 17:34:10 1997 Return-Path: Received: (from root@localhost) by freefall.freebsd.org (8.8.5/8.8.5) id RAA01159 for questions-outgoing; Mon, 21 Apr 1997 17:34:10 -0700 (PDT) Received: from tok.qiv.com ([204.214.141.211]) by freefall.freebsd.org (8.8.5/8.8.5) with ESMTP id RAA01152 for ; Mon, 21 Apr 1997 17:34:04 -0700 (PDT) Received: (from uucp@localhost) by tok.qiv.com (8.8.5/8.8.5) with UUCP id TAA01579 for freebsd-questions@freebsd.org; Mon, 21 Apr 1997 19:34:01 -0500 (CDT) Received: from localhost (jdn@localhost) by acp.qiv.com (8.8.5/8.8.5) with SMTP id TAA00659 for ; Mon, 21 Apr 1997 19:33:09 -0500 (CDT) X-Authentication-Warning: acp.qiv.com: jdn owned process doing -bs Date: Mon, 21 Apr 1997 19:33:09 -0500 (CDT) From: "Jay D. Nelson" To: freebsd-questions@freebsd.org Subject: Need help with disk tuning. Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-questions@freebsd.org X-Loop: FreeBSD.org Precedence: bulk I'm about to add a new Hawk to my system and would like to optimize all of my drives. Maybe I haven't R'ed enough of TFM. If so, please point me in the right direction. The default disklabel defines a disk at 3600 RPM with an interleave of 1. Are these numbers _actually_ used? Can performance be boosted by defining rotational speed as 5400 (or whatever the drive is rated) with an interleave of 0? If I do this, I suspect I'm pushing the envelope (Tekram SCSI card on an ISA bus). Would I gain anything by increasing block and fragment size? Say 16k block and 2k fragment? Or -- what about a block size of a full cylinder with a fragment of 1/8th cylinder? Thanks. -- Jay