Re: scsi_dh_alua: add missing transitioning state support

[Mike Snitzer <snitzer@redhat.com>]

On Thu, Sep 23 2010 at  3:15am -0400,
Hannes Reinecke <hare@suse.de> wrote:

> The device_handler will keep retrying any path in 'transitioning'.
> After ALUA_FAILOVER_TIMEOUT the device handler will either have
> updated the port state to something other than 'transitioning' or
> returned with 'SCSI_DH_RETRY'.
> But yes, you are right; we should be setting the port to something
> else than 'transitioning' then. Probably 'standby' is a good choice
> here.
> New patch attached.
> 
> Thanks for the review.
> 
> Cheers,
> 
> Hannes
> -- 
> Dr. Hannes Reinecke		      zSeries & Storage
> hare@suse.de			      +49 911 74053 688
> SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
> GF: Markus Rex, HRB 16746 (AG Nürnberg)

> From db02ba3c33a4a1dbfcdc4de1b73e378f7b3d8925 Mon Sep 17 00:00:00 2001
> From: Hannes Reinecke <hare@suse.de>
> Date: Wed, 22 Sep 2010 12:09:07 +0200
> Subject: [PATCH] scsi_dh_alua: Handle all states correctly
> 
> For ALUA we should be handling all states, independent of whether
> is explicit or implicit. For 'Transitioning' we should be retry
> for a certain amount of time; after that we're setting the port
> to 'Standby' and return SCSI_DH_RETRY to signal upper layers
> a retry is in order here.
> 
> Signed-off-by: Hannes Reinecke <hare@suse.de>

Acked-by: Mike Snitzer <snitzer@redhat.com>

Thanks.
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