From owner-freebsd-fs@FreeBSD.ORG Thu Feb 20 14:19:26 2014 Return-Path: Delivered-To: fs@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 E9AB27C5 for ; Thu, 20 Feb 2014 14:19:26 +0000 (UTC) Received: from mail-lb0-x234.google.com (mail-lb0-x234.google.com [IPv6:2a00:1450:4010:c04::234]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id 6B89315CB for ; Thu, 20 Feb 2014 14:19:26 +0000 (UTC) Received: by mail-lb0-f180.google.com with SMTP id n15so1377881lbi.11 for ; Thu, 20 Feb 2014 06:19:24 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlemail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; bh=kcuLvim5AwM0/FLuw+RYwpKLFPUV6L/2Ehv33GZYGak=; b=FTM1VZ7rko5Ojp61asaq8XbOJY9Bzgrb5quxg9j01mlJM85y0kpT4w8QFwA8Gf4pCa 73HtEnV9nw3PYHbPah+jhhMvYgLkBk+cYUwqX8MYyUczJLWGv0gcTfebmvWBNkX6R1eK XFIkeUEADGT+3hR1VOzCRfSgR95w6WH7w0sCrB0HqUtBXaEYl0F0yXL45DdlXF7oBEOM 1f4GVdCoqQYwKstbMbsu2q0RXfomU3sQSnwUinyzLpqsYUrGAxX1iabKDFnM2b+nRCnr pt8TRWk6VQcyq1cvOgO6vCngdERRaokgpBrQDn2Snl22dwuXRZlXUf8XVU6/oD42LYhV AwxQ== MIME-Version: 1.0 X-Received: by 10.152.36.70 with SMTP id o6mr1291878laj.7.1392905964227; Thu, 20 Feb 2014 06:19:24 -0800 (PST) Received: by 10.112.35.167 with HTTP; Thu, 20 Feb 2014 06:19:24 -0800 (PST) In-Reply-To: <53060C89.8040500@digiware.nl> References: <5305F8B0.1060308@digiware.nl> <783388CA2911497B98479F1187F49915@multiplay.co.uk> <53060C89.8040500@digiware.nl> Date: Thu, 20 Feb 2014 14:19:24 +0000 Message-ID: Subject: Re: What types of SSDs to use..... From: Tom Evans To: Willem Jan Withagen Content-Type: text/plain; charset=UTF-8 Cc: fs@freebsd.org X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 20 Feb 2014 14:19:27 -0000 On Thu, Feb 20, 2014 at 2:09 PM, Willem Jan Withagen wrote: > On 20-2-2014 14:06, Steven Hartland wrote: >> The "disconnect" issue is generally related to Sandforce based devices. >> >> Its a lot better on later devices / firmware and does depend on the >> controller / MB they are connected to. > > Any easy way to detect these? Or is it just a matter of reading the > specsheets? Hoping that the controller chipset is mentioned. > You can tell the old (SF-2000) chipset devices from their advertised read and write speeds - read will be 500+MBs, write will be 200-300MBs. This is because the "read speed" assumes you will be reading compressible data. I would avoid SF based drives if you can, I have had horrific experiences with OCZ Vertex 4 SSDs where they basically lock up if you do non-sequential access. Having said that, there are two parts to it, the controller and the firmware running on the controller; Intel SSDs using SF controllers, like the Intel 530, don't have such a bad reputation. Looking on wikipedia or tech review sites for a specific SSD should let you know what controller it uses, if it is not listed in the tech specs. I replaced my OCZ drives with Crucial M4, which use a Marvell controller. Cheers Tom