linux-kernel - Re: [PATCH 2/2] Drivers: scsi: storvsc: Force discovery of LUNs that may have been removed.

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Date:	Fri, 29 Aug 2014 13:53:42 +0000
From:	James Bottomley <jbottomley@...allels.com>
To:	"hare@...e.de" <hare@...e.de>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"hch@...radead.org" <hch@...radead.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"michaelc@...wisc.edu" <michaelc@...wisc.edu>,
	"kys@...rosoft.com" <kys@...rosoft.com>,
	"martin.petersen@...cle.com" <martin.petersen@...cle.com>,
	"bvanassche@....org" <bvanassche@....org>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	"ohering@...e.com" <ohering@...e.com>
Subject: Re: [PATCH 2/2] Drivers: scsi: storvsc: Force discovery of LUNs
 that may have been removed.

On Fri, 2014-08-29 at 10:13 +0200, Hannes Reinecke wrote:
> 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.

Um, I thought this was supposed to solve that problem:

commit 279afdfe78a020b4b1a68bffd0009b961b12982e
Author: Ewan D. Milne <emilne@...hat.com>
Date:   Thu Aug 8 15:07:48 2013 -0400

    [SCSI] Generate uevents on certain unit attention codes

The idea was supposed to be that, as you say, log scrubbers are hard to
configure and break every time someone fixes a spelling error, so we
could now listen for a report luns data change uevent instead.

James