From: Mike Snitzer Subject: Re: I/O topology fixes for big physical block size Date: Mon, 27 Sep 2010 19:15:52 -0400 Message-ID: <20100927231551.GA15653@redhat.com> References: <1285605664-27027-1-git-send-email-martin.petersen@oracle.com> <4CA0CC38.5010804@fusionio.com> <4CA118FF.1080100@fusionio.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Jens Axboe , "James.Bottomley@hansenpartnership.com" , "linux-scsi@vger.kernel.org" , linux-ext4@vger.kernel.org To: "Martin K. Petersen" Return-path: Received: from mx1.redhat.com ([209.132.183.28]:14621 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756413Ab0I0XP5 (ORCPT ); Mon, 27 Sep 2010 19:15:57 -0400 Content-Disposition: inline In-Reply-To: Sender: linux-ext4-owner@vger.kernel.org List-ID: On Mon, Sep 27 2010 at 6:36pm -0400, Martin K. Petersen wrote: > >>>>> "Jens" == Jens Axboe writes: > Jens> Does mkfs do the right thing? > > Depends on which mkfs it is. Mike has tested things and can chip in > here... I haven't test all mkfs.* but... mkfs.xfs just works with 1M physical_block_size. mkfs.ext4 won't by default but -F "fixes" that: # mkfs.ext4 -b 4096 -F /dev/mapper/20017380023360006 mke2fs 1.41.12 (17-May-2010) Warning: specified blocksize 4096 is less than device physical sectorsize 1048576, forced to continue ... I'll check fdisk and parted tomorrow (I know lvm2 doesn't look at physical_block_size).