From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ian Pilcher Subject: Re: Multiple SSDs - RAID-1, -10, or stacked? TRIM? Date: Wed, 09 Oct 2013 09:46:43 -0500 Message-ID: References: <20131009123135.GT1779@bitfolk.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20131009123135.GT1779@bitfolk.com> Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids On 10/09/2013 07:31 AM, Andy Smith wrote: > Any insights appreciated. Consider the probable failure mode of an SSD. An SSD is more likely than an HDD to (1) die with absolutely no warning and (2) die due to the pattern of data written to it over its lifetime (and the way those writes interact with the SSD's controller/firmware). #2 in particular means that there is potentially a much higher correlation between the failures of SSDs in an array than there is of HDDs. (And #1 means that the consequences will be more catastrophic.) I would recommend using SSDs with two different types on controllers. -- ======================================================================== Ian Pilcher arequipeno@gmail.com Sometimes there's nothing left to do but crash and burn...or die trying. ========================================================================