From owner-freebsd-questions@FreeBSD.ORG Fri Aug 22 16:55:23 2014 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id B3BC1CE1 for ; Fri, 22 Aug 2014 16:55:23 +0000 (UTC) Received: from mail2.nber.org (mail2.nber.org [198.71.6.79]) by mx1.freebsd.org (Postfix) with ESMTP id 74A2B3A5C for ; Fri, 22 Aug 2014 16:55:23 +0000 (UTC) Received: from nber2.nber.org (nber2.nber.org [198.71.6.72]) by mail2.nber.org (8.14.8/8.14.5) with ESMTP id s7MGfvYK019101 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT); Fri, 22 Aug 2014 12:41:58 -0400 (EDT) (envelope-from feenberg@nber.org) Date: Fri, 22 Aug 2014 12:41:57 -0400 (EDT) From: Daniel Feenberg To: RW Subject: Re: solid state drives? In-Reply-To: <20140822170112.69830ad9@gumby.homeunix.com> Message-ID: References: <53F22E89.3050005@rcn.com> <53F2399D.5050609@hiwaay.net> <20140822170112.69830ad9@gumby.homeunix.com> User-Agent: Alpine 2.11 (LRH 23 2013-08-11) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed X-Anti-Virus: Kaspersky Anti-Virus for Linux Mail Server 5.6.39/RELEASE, bases: 20140401 #7726142, check: 20140822 clean Cc: freebsd-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: Fri, 22 Aug 2014 16:55:23 -0000 On Fri, 22 Aug 2014, RW wrote: > On Mon, 18 Aug 2014 12:36:29 -0500 > William A. Mahaffey III wrote: > > >> None of the SSD's are/will be as durable as spinning drives for >> writes .... That said, the SLC type are more durable than MLC or >> TLC .... Also more $$$$ & usually only available in smaller sizes. >> Good for a root drive, i.e. mostly read-olny operations. Swap & >> everything else on spinning platters .... > > A typical modern 120GB MLC SSD will have a specified write endurance of > around 8TB which is equivalent to 1GB a day for 22 years. They should > be fine for most things where there's nothing doing heavy duty writing. I sort of understand that - but does the SSD have the ability to move unchanged data around to even out the wear? That is, if I fill the drive with 100GB of never changing files, and then write lots of frequently changing files to the last 20GB, does this put all the wear on a small portion of the drive, while most of the drive suffers no wear at all? Maybe I should do a full backup and restore once a year? Daniel Feenberg > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org" >