From owner-freebsd-questions@FreeBSD.ORG Wed Nov 21 02:50:13 2012 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 16BA5B3F for ; Wed, 21 Nov 2012 02:50:13 +0000 (UTC) (envelope-from FreeBSD@shaneware.biz) Received: from ipmail07.adl2.internode.on.net (ipmail07.adl2.internode.on.net [IPv6:2001:44b8:8060:ff02:300:1:2:7]) by mx1.freebsd.org (Postfix) with ESMTP id 48FAD8FC13 for ; Wed, 21 Nov 2012 02:50:11 +0000 (UTC) X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AsgEAEdArFDLevdH/2dsb2JhbABEvwaDZXOCHgEBBAE4QQULCxgJEwMPCQMCAQIBRQYNAQcBAYgDBb9CjDQCEoROA6Y/gwKBSA Received: from ppp247-71.static.internode.on.net (HELO leader.local) ([203.122.247.71]) by ipmail07.adl2.internode.on.net with ESMTP; 21 Nov 2012 13:20:10 +1030 Message-ID: <50AC3F64.8060709@ShaneWare.Biz> Date: Wed, 21 Nov 2012 13:11:40 +1030 From: Shane Ambler User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:16.0) Gecko/20121030 Thunderbird/16.0.2 MIME-Version: 1.0 To: bsd Subject: Re: SSD for FreeBSD NAS device References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Liste FreeBSD X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 21 Nov 2012 02:50:13 -0000 On 20/11/2012 20:54, bsd wrote: > Hello, > > I have just acquired an Intel R2312GZ4GC4 which I have equipped with > a Adaptec RAID 51245 and 6 WD red disks of 3To - It'll come with > 32Gb of Kingston ECC RAM. > > I am planing to use It as a backup device on a second hosting > facility to backup couple of critical servers of mine. > Do you think I should go for a redundant SSD drives (RAID 1) or does > this offers limited interest in such config ? The advantage of SSD drives is their speed, in a ZFS config they can help most in two ways, as cache devices to speed up disk access or as log devices to increase reliability. Personally for a backup server I would use the two SSD drives as a mirrored log device for the ZFS pool. Reliability over performance. Having said that if you haven't got them I wouldn't get them. For a busy fileserver in the office you want the extra performance. As an offsite backup server the time saved in performance is only going to impact a few times a day and will be outweighed by the network speed. The cost of the SSD drives could add more drives to increase space or redundancy - RAIDZ3 ?