From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Martin K. Petersen" Subject: Re: REQUEST for new 'topology' metrics to be moved out of the 'queue' sysfs directory. Date: Thu, 25 Jun 2009 13:43:23 -0400 Message-ID: References: <19010.62951.886231.96622@notabene.brown> <125b48b7ffc99a496fbdd512f38cada5.squirrel@neil.brown.name> <4A43612F.2000100@anonymous.org.uk> Reply-To: device-mapper development Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: In-Reply-To: <4A43612F.2000100@anonymous.org.uk> (John Robinson's message of "Thu, 25 Jun 2009 12:36:15 +0100") List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com To: John Robinson Cc: linux-raid@vger.kernel.org, "Martin K. Petersen" , Mike Snitzer , linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, linux-ide@vger.kernel.org, device-mapper development , jens.axboe@oracle.com, linux-fsdevel@vger.kernel.org, Linus Torvalds , Alasdair G Kergon List-Id: linux-raid.ids >>>>> "John" == John Robinson writes: John> Even sadder, when a raid 0/4/5/6 is reshaped over more discs (and John> probably other scenarios outwith md), I'm not sure I agree with the whole "sad" sentiment. Just because ext[234] doesn't query devices automatically doesn't mean the technology doesn't exist. I wrote the MD/LVM extraction code for XFS in 2001. John> both stripe-width and stride-size change. Is there any prospect John> this new stacking could give us the opportunity to tell our client John> (LVM, filesystem, whatever) about the change, or that they'll be John> able to take advantage of it? When you resize the fs it would have to compare the new topology to the old one and adjust accordingly. -- Martin K. Petersen Oracle Linux Engineering