Received: from localhost (unknown [200.46.204.183]) by developer.postgresql.org (Postfix) with ESMTP id B1AB62E0038 for ; Mon, 7 Apr 2008 17:50:06 -0300 (ADT) Received: from developer.postgresql.org ([200.46.204.71]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 06071-07 for ; Mon, 7 Apr 2008 17:50:03 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.5 Received: from mx00.pub.collaborativefusion.com (mx00.pub.collaborativefusion.com [206.210.89.199]) by developer.postgresql.org (Postfix) with ESMTP id 3733D2E003A for ; Mon, 7 Apr 2008 17:50:03 -0300 (ADT) Received: from vanquish.ws.pitbpa0.priv.collaborativefusion.com (vanquish.ws.pitbpa0.priv.collaborativefusion.com [192.168.2.162]) (SSL: TLSv1/SSLv3,256bits,AES256-SHA) by wingspan with esmtp; Mon, 07 Apr 2008 16:50:37 -0400 id 00056454.47FA891D.0000EC3E Date: Mon, 7 Apr 2008 16:49:54 -0400 From: Bill Moran To: Greg Smith Cc: pgsql-performance@postgresql.org Subject: Re: Looking for bottleneck during load test Message-Id: <20080407164954.844a197b.wmoran@collaborativefusion.com> In-Reply-To: References: <20080407162008.c70fbb38.wmoran@collaborativefusion.com> Organization: Collaborative Fusion X-Mailer: Sylpheed 2.4.8 (GTK+ 2.12.8; i386-portbld-freebsd6.3) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Virus-Scanned: Maia Mailguard 1.0.1 X-Archive-Number: 200804/76 X-Sequence-Number: 29569 In response to Greg Smith : > On Mon, 7 Apr 2008, Bill Moran wrote: > > > You know, with all the performance problems people have been bringing up > > with regard to SANs, I'm putting SAN in the same category as RAID-5 ... > > Not really fair, because unlike RAID5 it's at least *possible* to get good > write performance out of a SAN. Just harder than most people think it is. *shrug* "in theory" it's possible to get good write performance out of RAID-5 as well, with fast enough disks and enough cache ... -- Bill Moran Collaborative Fusion Inc. http://people.collaborativefusion.com/~wmoran/ wmoran@collaborativefusion.com Phone: 412-422-3463x4023