From mboxrd@z Thu Jan 1 00:00:00 1970 From: Henrique de Moraes Holschuh Subject: Re: MD/RAID time out writing superblock Date: Mon, 14 Sep 2009 10:11:14 -0300 Message-ID: <20090914131114.GA32253@khazad-dum.debian.net> References: <4A970154.2020507@redhat.com> <4A9B8583.9050601@kernel.org> <4A9BBC4A.6070708@redhat.com> <4A9BC023.10903@kernel.org> <20090907114442.GG18831@arachsys.com> <20090907115927.GU8710@arachsys.com> <20090909120218.GB21829@arachsys.com> <4AADF3C4.5060004@kernel.org> <4AADF471.2020801@suse.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from out1.smtp.messagingengine.com ([66.111.4.25]:37669 "EHLO out1.smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752535AbZINNLO (ORCPT ); Mon, 14 Sep 2009 09:11:14 -0400 Content-Disposition: inline In-Reply-To: <4AADF471.2020801@suse.de> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Tejun Heo Cc: Chris Webb , linux-scsi@vger.kernel.org, Ric Wheeler , Andrei Tanas , NeilBrown , linux-kernel@vger.kernel.org, IDE/ATA development list , Jeff Garzik , Mark Lord On Mon, 14 Sep 2009, Tejun Heo wrote: > Oooh, another possibility is the above continuous IDENTIFY tries. > Doing things like that generally isn't a good idea because vendors > don't expect IDENTIFY to be mixed regularly with normal IOs and IMHO that means the kernel should be special-casing such commands, then (i.e quiesce drive, do command, quiesce driver, start IO again), probably rate-limiting it for good effect. This is the kind of stuff that userspace should NOT have to worry about (because it will get it wrong and cause data corruption eventually). -- "One disk to rule them all, One disk to find them. One disk to bring them all and in the darkness grind them. In the Land of Redmond where the shadows lie." -- The Silicon Valley Tarot Henrique Holschuh