From owner-freebsd-questions@FreeBSD.ORG Sat Feb 12 01:14:39 2011 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 31E54106566C for ; Sat, 12 Feb 2011 01:14:39 +0000 (UTC) (envelope-from amvandemore@gmail.com) Received: from mail-fx0-f54.google.com (mail-fx0-f54.google.com [209.85.161.54]) by mx1.freebsd.org (Postfix) with ESMTP id B75958FC08 for ; Sat, 12 Feb 2011 01:14:38 +0000 (UTC) Received: by fxm16 with SMTP id 16so3597093fxm.13 for ; Fri, 11 Feb 2011 17:14:37 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:in-reply-to:references:date :message-id:subject:from:to:content-type; bh=pOUF5rmc4yHCsnlSZ5o7pIIbRFdntlYBwlK4keCOLFw=; b=GhD97wDDO2dr8SBdPi7yNABqkobFmKFy9URWnj/g9hTiz4f8BS0f/DEnlJYKPLzxU5 GDHFapAGFTNHDDEhZnlVqW+mwXVY4LEHGsKJJ5QYN5hd8B2cUi3DFOVdfece/w1KGqm6 OcmqxIxVYCHTtNIkBP/61s8fhBgzMm+a76yy4= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=vjycInmb9kg/c+VrsIHiLmGg90Ku1eV59smHtEobWVpuomkZVrAWYj5VQzP9Gw8mK8 6bCMnsCreb2IOIzA/MIL3fpbWkzw7b5bKQUIubg+gtrJsKGBNHTmws180hTCt8zdNr2W K3bOtttl8jKB5cIVEdEqC2BbwKikJHTOVjyG4= MIME-Version: 1.0 Received: by 10.223.71.197 with SMTP id i5mr963336faj.127.1297452787562; Fri, 11 Feb 2011 11:33:07 -0800 (PST) Received: by 10.223.114.4 with HTTP; Fri, 11 Feb 2011 11:33:07 -0800 (PST) In-Reply-To: <20110211185738.GB45708@guilt.hydra> References: <4D550415.8060105@ifdnrg.com> <20110211185738.GB45708@guilt.hydra> Date: Fri, 11 Feb 2011 13:33:07 -0600 Message-ID: From: Adam Vande More To: FreeBSD Mailing List Content-Type: text/plain; charset=ISO-8859-1 X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Subject: Re: FreeBSD and SSD drives X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 12 Feb 2011 01:14:39 -0000 On Fri, Feb 11, 2011 at 12:57 PM, Chad Perrin wrote: > Ignoring the TRIM issue for a moment . . . > > You're probably best off saving SSD storage for cases where you have lots > of reads and little to no write activity, unless you enjoy buying new > SSDs a lot. Actually, let's not ignore TRIM; the work-around for lack of > TRIM support on some drives is a "garbage collection" routine that > exacerbates the problem of having to replace your SSDs more often if you > do a lot of writes. > > I guess I would only use SSDs on servers in the same cases where I would > let myself be talked into using MySQL -- cases where you just treat it > pretty much like a read-only data store, and do not have to (safely) add > or change data stored there most of the time. > Modern SSD's can do a *lot* of writes, wear-leveling and other tecniques allow SSD's to be implemented for nearly any workload. There's a great deal of literature and facts on this topic if someone was motivated enough to research it. Some legends are better off fading away. http://www.storagesearch.com/ssdmyths-endurance.html Same thing is sort of true with TRIM, on most modern drives lack of OS TRIM support isn't the performance hit it used to be although still desirable. -- Adam Vande More