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

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Message-ID: <54002E2E.7030301@acm.org>
Date:	Fri, 29 Aug 2014 09:39:26 +0200
From:	Bart Van Assche <bvanassche@....org>
To:	Hannes Reinecke <hare@...e.de>,
	Mike Christie <michaelc@...wisc.edu>,
	Christoph Hellwig <hch@...radead.org>,
	"K. Y. Srinivasan" <kys@...rosoft.com>
CC:	linux-kernel@...r.kernel.org, devel@...uxdriverproject.org,
	ohering@...e.com, jbottomley@...allels.com,
	linux-scsi@...r.kernel.org,
	"Martin K. Petersen" <martin.petersen@...cle.com>
Subject: Re: [PATCH 2/2] Drivers: scsi: storvsc: Force discovery of LUNs that
 may have been removed.

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.

Bart.

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