Received: from localhost (maia-4.hub.org [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 8E0F69FA1A7 for ; Wed, 6 Dec 2006 13:40:37 -0400 (AST) Received: from postgresql.org ([200.46.204.71]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-new, port 10024) with ESMTP id 62318-06 for ; Wed, 6 Dec 2006 13:40:36 -0400 (AST) X-Greylist: from auto-whitelisted by SQLgrey-1.7.4 Received: from exprod6og53.obsmtp.com (exprod6og53.obsmtp.com [64.18.1.187]) by postgresql.org (Postfix) with SMTP id 757579F9F0E for ; Wed, 6 Dec 2006 13:40:35 -0400 (AST) Received: from source ([63.240.6.47]) by exprod6ob53.postini.com ([64.18.5.12]) with SMTP; Wed, 06 Dec 2006 09:40:33 PST Received: from 172.16.1.114 by mail.Mi8.com with ESMTP (- Welcome to Mi8 Corporation www.Mi8.com (D1)); Wed, 06 Dec 2006 12:40:28 -0500 X-Server-Uuid: 241911D6-425B-44B9-A073-E3FE0F8FC774 Received: from MI8NYCMAIL08.Mi8.com ([172.16.1.164]) by d01smtp07.Mi8.com with Microsoft SMTPSVC(6.0.3790.1830); Wed, 6 Dec 2006 12:40:27 -0500 Received: from 69.181.100.71 ([69.181.100.71]) by MI8NYCMAIL08.Mi8.com ( [172.16.1.190]) via Exchange Front-End Server mi8owa.mi8.com ( [172.16.1.106]) with Microsoft Exchange Server HTTP-DAV ; Wed, 6 Dec 2006 17:40:27 +0000 User-Agent: Microsoft-Entourage/11.2.5.060620 Date: Wed, 06 Dec 2006 09:40:25 -0800 Subject: Re: File Systems Compared From: "Luke Lonergan" To: "Brian Hurt" cc: pgsql-performance@postgresql.org Message-ID: Thread-Topic: [PERFORM] File Systems Compared Thread-Index: AccZXZxn2yHt+IVQEdus3QAWy4o9DA== In-Reply-To: <4576F266.9040205@janestcapital.com> MIME-Version: 1.0 X-OriginalArrivalTime: 06 Dec 2006 17:40:27.0530 (UTC) FILETIME=[9DE916A0:01C7195D] X-WSS-ID: 6969DF064NO911794-01-01 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Virus-Scanned: Maia Mailguard 1.0.1 X-Archive-Number: 200612/131 X-Sequence-Number: 22187 Brian, On 12/6/06 8:40 AM, "Brian Hurt" wrote: > But actually looking things up, I see that PCI-Express has a theoretical 8 > Gbit/sec, or about 800Mbyte/sec. It's PCI-X that's 533 MByte/sec. So there's > still some headroom available there. See here for the official specifications of both: http://www.pcisig.com/specifications/pcix_20/ Note that PCI-X version 1.0 at 133MHz runs at 1GB/s. It's a parallel bus, 64 bits wide (8 bytes) and runs at 133MHz, so 8 x 133 ~= 1 gigabyte/second. PCI Express with 16 lanes (PCIe x16) can transfer data at 4GB/s. The Arecas use (PCIe x8, see here: http://www.areca.com.tw/products/html/pcie-sata.htm), so they can do 2GB/s. - Luke