From mboxrd@z Thu Jan 1 00:00:00 1970 From: Phillip Susi Subject: Re: HPA unlock during partition scan of RAID components Date: Fri, 04 Nov 2011 11:42:20 -0400 Message-ID: <4EB407DC.8070307@cfl.rr.com> References: <74AAB12B538EC94087A0D16AFDFC24F4045674@IRSMSX102.ger.corp.intel.com> <20111103153835.GF4417@google.com> <4EB2E4B7.7000103@cfl.rr.com> Reply-To: device-mapper development Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com To: Tejun Heo Cc: device-mapper development , Bartlomiej Zolnierkiewicz , "Hawrylewicz Czarnowski, Przemyslaw" List-Id: dm-devel.ids On 11/4/2011 10:48 AM, Tejun Heo wrote: > I frankly don't care about BIOSen locking up afterwards and I don't > think they are more common than the issues from not unlocking (e.g. > moving harddrive to another machine, hot-plugging - partition - > reboot). There will be a kernel param to disable unlocking behavior Could you clarify what issues you refer to? Moving a drive to another machine? > and that would be it. On top of that if bios is that screwed it's > probably a good idea to not use bios raid which is a silly thing to > begin with. Currently the problem is that the kernel doesn't unlock > by default and the heuristics can't be turned off, so we have unhappy > customers on both sides. Anyways, if md/dm people are on board, I'm > gonna push for that but otherwise there isn't much point. It isn't only a problem for bios raid, it also affects mdadm raid. Being able to defeat the heuristic would help, but I still don't see why the heuristic should be implemented in the kernel instead of user space?