From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter Rabbitson Subject: Re: XFS sunit/swidth for raid10 Date: Thu, 22 Mar 2007 13:05:08 +0100 Message-ID: <460270F4.1080604@rabbit.us> References: <4601BE85.8050005@rabbit.us> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids dean gaudet wrote: > On Thu, 22 Mar 2007, Peter Rabbitson wrote: > >> Hi, >> How does one determine the XFS sunit and swidth sizes for a software raid10 >> with 3 copies? > > mkfs.xfs uses the GET_ARRAY_INFO ioctl to get the data it needs from > software raid and select an appropriate sunit/swidth... > > although i'm not sure i agree entirely with its choice for raid10: So do I, especially as it makes no checks for the amount of copies (3 in my case, not 2). >it probably doesn't matter. This was essentially my question. For an array -pf3 -c1024 I get swidth = 4 * sunit = 4MiB. Is it about right and does it matter at all?