Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 1B6EA64FC02 for ; Sat, 20 Sep 2008 00:23:40 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 17003-04 for ; Sat, 20 Sep 2008 00:23:37 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from westnet.com (westnet.com [216.187.52.2]) by postgresql.org (Postfix) with ESMTP id DB61E64FC00 for ; Sat, 20 Sep 2008 00:23:35 -0300 (ADT) Received: from westnet.com (localhost [127.0.0.1]) by westnet.com (8.14.0/8.14.0) with ESMTP id m8K3NWRW019948; Fri, 19 Sep 2008 23:23:32 -0400 (EDT) Received: from localhost (gsmith@localhost) by westnet.com (8.14.0/8.13.2/Submit) with ESMTP id m8K3NW7f019944; Fri, 19 Sep 2008 23:23:32 -0400 (EDT) X-Authentication-Warning: westnet.com: gsmith owned process doing -bs Date: Fri, 19 Sep 2008 23:23:32 -0400 (EDT) From: Greg Smith X-X-Sender: gsmith@westnet.com To: Merlin Moncure cc: pgsql-performance@postgresql.org Subject: Re: Intel's X25-M SSD In-Reply-To: Message-ID: References: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/195 X-Sequence-Number: 31508 On Mon, 8 Sep 2008, Merlin Moncure wrote: > What's interesting about the X25 is that they managed to pull the > numbers they got out of a MLC flash product. They managed this with a > DRAM buffer and the custom controller. I finally found a good analysis of what's wrong with most of the cheap MLC drives: http://www.anandtech.com/cpuchipsets/intel/showdoc.aspx?i=3403&p=7 240ms random write latency...wow, no wonder I keep hearing so many reports of cheap SSD just performing miserably. JMicron is one of those companies I really avoid, never seen a design from them that wasn't cheap junk. Shame their awful part is in so many of the MLC flash products. -- * Greg Smith gsmith@gregsmith.com http://www.gregsmith.com Baltimore, MD