From owner-freebsd-questions@FreeBSD.ORG Mon Aug 18 17:53:20 2014 Return-Path: Delivered-To: questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 53C1B632 for ; Mon, 18 Aug 2014 17:53:20 +0000 (UTC) Received: from wonkity.com (wonkity.com [67.158.26.137]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "wonkity.com", Issuer "wonkity.com" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 022A831EA for ; Mon, 18 Aug 2014 17:53:19 +0000 (UTC) Received: from wonkity.com (localhost [127.0.0.1]) by wonkity.com (8.14.9/8.14.9) with ESMTP id s7IHrH21087522 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Mon, 18 Aug 2014 11:53:17 -0600 (MDT) (envelope-from wblock@wonkity.com) Received: from localhost (wblock@localhost) by wonkity.com (8.14.9/8.14.9/Submit) with ESMTP id s7IHrHYY087519; Mon, 18 Aug 2014 11:53:17 -0600 (MDT) (envelope-from wblock@wonkity.com) Date: Mon, 18 Aug 2014 11:53:17 -0600 (MDT) From: Warren Block To: Robert Huff Subject: Re: solid state drives? In-Reply-To: <53F22E89.3050005@rcn.com> Message-ID: References: <53F22E89.3050005@rcn.com> User-Agent: Alpine 2.11 (BSF 23 2013-08-11) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.4.3 (wonkity.com [127.0.0.1]); Mon, 18 Aug 2014 11:53:17 -0600 (MDT) Cc: questions@freebsd.org X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 18 Aug 2014 17:53:20 -0000 On Mon, 18 Aug 2014, Robert Huff wrote: > I have been tasked with converting several systems - some unix > (incl. FreeBSD), some Windows, to SSDs. Are these desktops or servers? > What I know about SSDs will fit on the head of a pin. > Can someone recommend a good primer and a trustworthy source for > information on product specs and reliability? Off-hand, I can't think of one. I can offer my article on setting up SSDs for FreeBSD: http://www.wonkity.com/~wblock/docs/html/ssd.html Enable TRIM. Enable AHCI if available. Don't image drives with tools that copy every block, like dd, because the SSD will think every block that has been written is in use. Some people like to leave unpartitioned space or an empty partition to add to the drive's built-in overprovisioning. Internally, SSDs are RAID0, so a 256G drive can sometimes give faster writes than a 128G drive. Don't get hung up on the maximum rated speed, which is mostly a pretend number you will never see. Instead, realize that it's the essentially zero access times that make SSDs fast, and concentrate on reliable drives. I've stuck mostly with Marvell controllers in SSDs from Plextor, Samsung, and Toshiba. Other brands, including Intel, use Sandforce controllers.