From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hannes Reinecke Subject: Re: [PATCH 2/2] Drivers: scsi: storvsc: Force discovery of LUNs that may have been removed. Date: Fri, 29 Aug 2014 10:13:44 +0200 Message-ID: <54003638.5010301@suse.de> References: <1408244954-27417-1-git-send-email-kys@microsoft.com> <1408244988-27456-1-git-send-email-kys@microsoft.com> <1408244988-27456-2-git-send-email-kys@microsoft.com> <20140819175431.GA4617@infradead.org> <53FDEBB9.5070704@suse.de> <53FFE87B.9040802@cs.wisc.edu> <54001B5F.9040506@suse.de> <54002E2E.7030301@acm.org> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1"; Format="flowed" Content-Transfer-Encoding: quoted-printable Return-path: In-Reply-To: <54002E2E.7030301@acm.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: driverdev-devel-bounces@linuxdriverproject.org Sender: driverdev-devel-bounces@linuxdriverproject.org To: Bart Van Assche , Mike Christie , Christoph Hellwig , "K. Y. Srinivasan" Cc: "Martin K. Petersen" , linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, jbottomley@parallels.com, ohering@suse.com, devel@linuxdriverproject.org List-Id: linux-scsi@vger.kernel.org On 08/29/2014 09:39 AM, Bart Van Assche wrote: > On 08/29/14 08:19, Hannes Reinecke wrote: >> On 08/29/2014 04:42 AM, Mike Christie wrote: >>> How are distros handling 0x6/0x3f/0x0e (report luns changed) when it >>> gets passed to userspace? Is everyone kicking off a new full (add and >>> delete) scan to handle this or logging it? Is the driver returning this >>> when the LUNs change? >>> >> Currently it's logged to userspace and ignored. >> Doing an automated rescan has proven to be dangerous, as it >> might disconnect any LUNs which are still in use by applications. >> Especially HA or database setups tends to become very annoyed >> when you do an automated rescan. > > Has it already been considered to add newly discovered LUNs > automatically and to leave it to the user to remove stale LUNs manually > ? That would be similar to what the rescan-scsi-bus.sh script does > without option -r/--remove. > As of now we're still missing an in-kernel infrastructure which = would allow us to react on any sense codes; currently we're relying = on the administrator to setup a udev rule here. Cheers, Hannes -- = Dr. Hannes Reinecke zSeries & Storage hare@suse.de +49 911 74053 688 SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 N=FCrnberg GF: J. Hawn, J. Guild, F. Imend=F6rffer, HRB 16746 (AG N=FCrnberg)