X-Original-To: pgsql-performance-postgresql.org@postgresql.org Received: from localhost (mx1.hub.org [200.46.208.251]) by postgresql.org (Postfix) with ESMTP id 32C679FB2B9 for ; Tue, 1 Aug 2006 19:19:55 -0300 (ADT) Received: from postgresql.org ([200.46.204.71]) by localhost (mx1.hub.org [200.46.208.251]) (amavisd-new, port 10024) with ESMTP id 50954-03 for ; Tue, 1 Aug 2006 19:19:49 -0300 (ADT) X-Greylist: domain auto-whitelisted by SQLgrey- Received: from mail.gmx.net (mail.gmx.net [213.165.64.21]) by postgresql.org (Postfix) with SMTP id 10EB69FB1D4 for ; Tue, 1 Aug 2006 19:19:48 -0300 (ADT) Received: (qmail invoked by alias); 01 Aug 2006 22:19:46 -0000 Received: from dslb-084-057-006-224.pools.arcor-ip.net (EHLO ltmku) [84.57.6.224] by mail.gmx.net (mp010) with SMTP; 02 Aug 2006 00:19:46 +0200 X-Authenticated: #23352258 From: "Milen Kulev" To: Subject: FW: XFS filessystem for Datawarehousing -2 Date: Wed, 2 Aug 2006 00:19:46 +0200 Message-ID: <014401c6b5b8$98926a20$0a00a8c0@trivadis.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1441 X-Y-GMX-Trusted: 0 X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0.067 tagged_above=0 required=5 tests=AWL, SPF_PASS X-Spam-Level: X-Archive-Number: 200608/14 X-Sequence-Number: 20199 Sorry, forgot to ask: What is the recommended/best PG block size for DWH database? 16k, 32k, 64k ? What hsould be the relation between XFS/RAID stripe size and PG block size ? Best Regards. Milen Kulev -----Original Message----- From: pgsql-performance-owner@postgresql.org [mailto:pgsql-performance-owner@postgresql.org] On Behalf Of Milen Kulev Sent: Tuesday, August 01, 2006 11:50 PM To: pgsql-performance@postgresql.org Subject: [PERFORM] XFS filessystem for Datawarehousing I intend to test Postgres/Bizgres for DWH use. I want to use XFS filesystem to get the best possible performance at FS level(correct me if I am wrong !). Is anyone using XFS for storing/retrieving relatively large amount of data (~ 200GB)? If yes, what about the performance and stability of XFS. I am especially interested in recommendations about XFS mount options and mkfs.xfs options. My setup will be roughly this: 1) 4 SCSI HDD , 128GB each, 2) RAID 0 on the four SCSI HDD disks using LVM (software RAID) There are two other SATA HDD in the server. Server has 2 physical CPUs (XEON at 3 GHz), 4 Logical CPUs, 8 GB RAM, OS = SLES9 SP3 My questions: 1) Should I place external XFS journal on separate device ? 2) What should be the journal buffer size (logbsize) ? 3) How many journal buffers (logbufs) should I configure ? 4) How many allocations groups (for mkfs.xfs) should I configure 5) Is it wortj settion noatime ? 6) What I/O scheduler(elevators) should I use (massive sequencial reads) 7) What is the ideal stripe unit and width (for a RAID device) ? I will appreciate any options, suggestions, pointers. Best Regards. Milen Kulev ---------------------------(end of broadcast)--------------------------- TIP 4: Have you searched our list archives? http://archives.postgresql.org