From owner-freebsd-current@FreeBSD.ORG Thu Jan 19 00:14:33 2006 Return-Path: X-Original-To: freebsd-current@freebsd.org Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 35C4916A41F for ; Thu, 19 Jan 2006 00:14:33 +0000 (GMT) (envelope-from dworkin@village.org) Received: from green-dome.village.org (green-dome.village.org [168.103.84.186]) by mx1.FreeBSD.org (Postfix) with ESMTP id 8C10B43D49 for ; Thu, 19 Jan 2006 00:14:32 +0000 (GMT) (envelope-from dworkin@village.org) Received: from green-dome.village.org (localhost.village.org [127.0.0.1]) by green-dome.village.org (8.11.0/8.11.0) with ESMTP id k0J0EUB27323 for ; Wed, 18 Jan 2006 17:14:30 -0700 (MST) Message-Id: <200601190014.k0J0EUB27323@green-dome.village.org> To: freebsd-current@freebsd.org From: dlm-fb@weaselfish.com In-reply-to: Your message of Wed, 18 Jan 2006 08:28:04 GMT Date: Wed, 18 Jan 2006 17:14:29 -0700 Subject: Re: [PATCH] Support for large number of md(4) disks X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 19 Jan 2006 00:14:33 -0000 "Wojciech A. Koszek" wrote: : [1] cases in which total device number will change are as probable as : using more than 100 md(4) disks ;-) This is why I decided to use simple : request for a size and to do a request for md(4) list. FWIW, to address the implicit ``no one would ever ....'' My employer is currently planning on using several hundred (or more) md disks at a time in an upcoming project. We don't need to have all of the md devices immediately available at boot, so fsck'ing the relatively-small filesystems on them on demand would be much more attractive than doing a single multi-terabyte check up front would be. For various reasons, soft updates aren't a viable option for us right now, so background fsck doesn't help. Dworkin