From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from relay.sgi.com (relay3.corp.sgi.com [198.149.34.15]) by oss.sgi.com (Postfix) with ESMTP id 2364F7F4E for ; Sat, 13 Jul 2013 19:11:47 -0500 (CDT) Received: from cuda.sgi.com (cuda2.sgi.com [192.48.176.25]) by relay3.corp.sgi.com (Postfix) with ESMTP id 935EEAC002 for ; Sat, 13 Jul 2013 17:11:43 -0700 (PDT) Received: from mail-ob0-f177.google.com (mail-ob0-f177.google.com [209.85.214.177]) by cuda.sgi.com with ESMTP id Xt9eZnzKzegs3MFj (version=TLSv1 cipher=RC4-SHA bits=128 verify=NO) for ; Sat, 13 Jul 2013 17:11:42 -0700 (PDT) Received: by mail-ob0-f177.google.com with SMTP id ta17so12576758obb.22 for ; Sat, 13 Jul 2013 17:11:42 -0700 (PDT) Received: from [192.168.1.74] (75-63-29-182.lightspeed.irvnca.sbcglobal.net. [75.63.29.182]) by mx.google.com with ESMTPSA id rs4sm61584743obc.10.2013.07.13.17.11.39 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Sat, 13 Jul 2013 17:11:40 -0700 (PDT) From: aurfalien Subject: specify agsize? Date: Sat, 13 Jul 2013 17:11:38 -0700 Message-Id: <6A14EB72-A699-47AF-937D-D6DA1CF12ACB@gmail.com> Mime-Version: 1.0 (Apple Message framework v1085) 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 Hello again, I have a Raid 6 x16 disk array with 128k stripe size and a 512 byte block size. So I do; mkfs.xfs -f -l size=512m -d su=128k,sw=14 /dev/mapper/vg_doofus_data-lv_data And I get; meta-data=/dev/mapper/vg_doofus_data-lv_data isize=256 agcount=32, agsize=209428640 blks = sectsz=512 attr=2, projid32bit=0 data = bsize=4096 blocks=6701716480, imaxpct=5 = sunit=32 swidth=448 blks naming =version 2 bsize=4096 ascii-ci=0 log =internal log bsize=4096 blocks=131072, version=2 = sectsz=512 sunit=32 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0 All is fine but I was recently made aware of tweaking agsize. So I would like to mess around and iozone any diffs between the above agcount of 32 and whatever agcount changes I may do. I didn't see any mention of agsize/agcount on the XFS FAQ and would like to know, based on the above, why does XFS think I have 32 allocation groups with the corresponding size? And are these optimal numbers? Thanks in advance, - aurf _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs