X-Original-To: pgsql-performance-postgresql.org@localhost.postgresql.org Received: from localhost (unknown [200.46.204.144]) by svr1.postgresql.org (Postfix) with ESMTP id 7842152CA1 for ; Tue, 26 Jul 2005 16:27:25 -0300 (ADT) Received: from svr1.postgresql.org ([200.46.204.71]) by localhost (av.hub.org [200.46.204.144]) (amavisd-new, port 10024) with ESMTP id 57959-03 for ; Tue, 26 Jul 2005 19:27:16 +0000 (GMT) Received: from vms042pub.verizon.net (vms042pub.verizon.net [206.46.252.42]) by svr1.postgresql.org (Postfix) with ESMTP id 341B152C87 for ; Tue, 26 Jul 2005 16:27:15 -0300 (ADT) Received: from osgiliath.mathom.us ([70.108.53.154]) by vms042.mailsrvcs.net (Sun Java System Messaging Server 6.2 HotFix 0.04 (built Dec 24 2004)) with ESMTPA id <0IK900KOO21CJ9CH@vms042.mailsrvcs.net> for pgsql-performance@postgresql.org; Tue, 26 Jul 2005 14:27:13 -0500 (CDT) Received: from localhost (localhost [127.0.0.1]) by osgiliath.mathom.us (Postfix) with ESMTP id 292246247A1 for ; Tue, 26 Jul 2005 14:33:43 -0400 (EDT) Received: from osgiliath.mathom.us ([127.0.0.1]) by localhost (osgiliath [127.0.0.1]) (amavisd-new, port 10024) with LMTP id 03245-01-16 for ; Tue, 26 Jul 2005 14:33:43 -0400 (EDT) Received: by osgiliath.mathom.us (Postfix, from userid 1000) id 10D43623284; Tue, 26 Jul 2005 14:33:43 -0400 (EDT) Date: Tue, 26 Jul 2005 14:33:43 -0400 From: Michael Stone Subject: Re: Cheap RAM disk? In-reply-to: To: pgsql-performance@postgresql.org Mail-Followup-To: pgsql-performance@postgresql.org Message-id: <20050726183343.GZ19080@mathom.us> MIME-version: 1.0 Content-type: text/plain; charset=us-ascii; format=flowed Content-disposition: inline X-Pgp-Fingerprint: 53 FF 38 00 E7 DD 0A 9C 84 52 84 C5 EE DF 7C 88 X-Virus-Scanned: by amavisd-new-20030616-p10 (Debian) at mathom.us References: <42E6661D.3060304@arbash-meinel.com> User-Agent: Mutt/1.5.9i X-Virus-Scanned: by amavisd-new at hub.org X-Spam-Status: No, hits=0.008 tagged_above=0 required=5 tests=AWL X-Spam-Level: X-Archive-Number: 200507/401 X-Sequence-Number: 13642 On Tue, Jul 26, 2005 at 11:23:23AM -0700, Luke Lonergan wrote: >Yup - interesting and very niche product - it seems like it's only obvious >application is for the Postgresql WAL problem :-) On the contrary--it's not obvious that it is an ideal fit for a WAL. A ram disk like this is optimized for highly random access applications. The WAL is a single sequential writer. If you're in the kind of market that needs a really high performance WAL you'd be much better served by putting a big NVRAM cache in front of a fast disk array than by buying a toy like this. Mike Stone