From owner-freebsd-questions@FreeBSD.ORG Thu Jan 29 12:50:31 2004 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 7734216A4CE for ; Thu, 29 Jan 2004 12:50:31 -0800 (PST) Received: from main.gmane.org (main.gmane.org [80.91.224.249]) by mx1.FreeBSD.org (Postfix) with ESMTP id 5020B43D1F for ; Thu, 29 Jan 2004 12:50:29 -0800 (PST) (envelope-from freebsd-questions@m.gmane.org) Received: from root by main.gmane.org with local (Exim 3.35 #1 (Debian)) id 1AmJ7L-0006XM-00 for ; Thu, 29 Jan 2004 21:50:27 +0100 Received: from makrothumia.wingnet.net ([206.30.215.5]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu Jan 29 20:50:27 2004 Received: from jesse by makrothumia.wingnet.net with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu Jan 29 20:50:27 2004 X-Injected-Via-Gmane: http://gmane.org/ To: freebsd-questions@freebsd.org From: Jesse Guardiani Date: Sun, 25 Jan 2004 01:56:14 -0500 Organization: WingNET Lines: 62 Message-ID: References: <20040123150648.64dbb023.clists@gotbrains.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7Bit X-Complaints-To: usenet@sea.gmane.org Gmane-NNTP-Posting-Host: makrothumia.wingnet.net User-Agent: KNode/0.7.2 X-Mail-Copies-To: never Sender: news Subject: Re: Hot Swap hardware on FreeBSD? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list Reply-To: jesse@wingnet.net List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Jan 2004 20:50:31 -0000 Stephen P. Cravey wrote: > I'm trying to locate a good resource for creating hot swap capable servers > with FreeBSD and Vinum. > > Specifically, I'm trying to find out several things: > > Are there resources somewhere that document this type of thing? Please? > > Do I need controllers for SATA/SCSI that will handle the > plugging/unplugging of drives, or do I just need to do a bus rescan (or > the like) after the change and notify vinum? I'm not sure that you can do hot-swapping with vinum. Please let me know if you get it to work. Typically you'll need one of the following: 1.) Firewire external drives 2.) SCA SCSI drives. If you go with #2, you'll probably be getting a hardware RAID card with the deal and IT will manage your volume if a drive goes bad. In that case you shouldn't have to do anything under FreeBSD (assuming you're actually running one of the redundant RAID levels, and not just striping). I'm also not sure that you can use SATA for hot swapping. If you CAN, then you'd either need a hardware RAID card as with SCSI above, or you'd need to unmount the drive and issue an `atacontrol detach` command before removing the drive. > i.e. do i need something like > an adaptec 2200S or will a 39320 work? > > Is there anything in particular I should look for when buying hot swap > chassis? Other than SCA for SCSI? SCA works well on my machines at work. Other than that, you can find multi- drive firewire cases online. [...] > Where can I find (recent) performance numbers for raid 0,1,5 comparisons? That's a very broad question. How fast are your drives? What's your interface (i.e. Firewire? SCSI-160? SCSI-320? ATA?) Will you be using vinum or a hardware RAID controller? Which hardware RAID controller (they're DEFINATELY not all created equal!)? In general, you'll probably get optimum speed with vinum. However, it'll chew up your CPU and it might not be as reliable as a hardware solution. -- Jesse Guardiani, Systems Administrator WingNET Internet Services, P.O. Box 2605 // Cleveland, TN 37320-2605 423-559-LINK (v) 423-559-5145 (f) http://www.wingnet.net >From aaa@aaa Mon Jan 01 00:00:00 1997