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

Hannes Reinecke
2014-08-29T08:13:44Z

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
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