From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from relay.sgi.com (relay2.corp.sgi.com [137.38.102.29]) by oss.sgi.com (Postfix) with ESMTP id 9B4F37F3F for ; Thu, 7 Feb 2013 09:42:35 -0600 (CST) Received: from cuda.sgi.com (cuda3.sgi.com [192.48.176.15]) by relay2.corp.sgi.com (Postfix) with ESMTP id 8AF7C304032 for ; Thu, 7 Feb 2013 07:42:32 -0800 (PST) Received: from smtpbg56.qq.com (smtpbg56.qq.com [64.71.138.45]) by cuda.sgi.com with SMTP id U4rS1sDJFuAVOvHa for ; Thu, 07 Feb 2013 07:42:31 -0800 (PST) Received: from [192.168.1.2] (unknown [60.30.217.59]) by esmtp4.qq.com (ESMTP) with SMTP id 0 for ; Thu, 07 Feb 2013 23:42:26 +0800 (CST) Message-ID: <5113CB5D.40007@Tydus.org> Date: Thu, 07 Feb 2013 23:42:21 +0800 From: Tydus Ken MIME-Version: 1.0 Subject: XFS on RAID5+LVM with scheduled capacity grow List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: xfs-bounces@oss.sgi.com Sender: xfs-bounces@oss.sgi.com To: xfs@oss.sgi.com Hi list, I'm new here, and also new to RAID. I just bought a LSI RAID card and 3 new 2TB HDDs (together with 2 old ones), and trying to build a RAID5 volume. Because I don't have spare drives, I'm doing like this: use the 3 new ones to build RAID5, then create a LVM VG on it as partition table, make an XFS (as well as a BTRFS for profile and personal data) on it. Then grow it to 5 drives use MegaCLi, do a vgextend, then xfs_growfs. Now the question is, I cannot deside sw of XFS (https://raid.wiki.kernel.org/index.php/RAID_setup#XFS). I think I should use 4(5-1), but it has poor performance (~140MB/s while raw disk write is ~250M). Is this all right? Or should I specify sunit and swidth in the mount options? I don't really know the mechanic of XFS on this, does this have effect on read? Additionally, I want to know if this is the optimal method for me or just use GPT? Maybe I will grow the array to more disks later. Any help is appreciated. Tydus Ken _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs