From: Hannes Reinecke <hare@suse.de>
To: Dan Williams <dan.j.williams@intel.com>
Cc: linux-scsi@vger.kernel.org, Dave Jiang <dave.jiang@intel.com>,
dmilburn@redhat.com, jack_wang@usish.com,
Jeff Skirvin <jeffrey.d.skirvin@intel.com>,
yuxiangl@marvell.com, hch@lst.de
Subject: Re: [RFC PATCH] isci: filter broadcast change notifications during SMP phy resets
Date: Mon, 27 Jun 2011 16:34:20 +0200 [thread overview]
Message-ID: <4E0894EC.2010509@suse.de> (raw)
In-Reply-To: <20110624194109.26706.58553.stgit@localhost6.localdomain6>
On 06/24/2011 09:48 PM, Dan Williams wrote:
> From: Jeff Skirvin<jeffrey.d.skirvin@intel.com>
>
> When resetting a sata device in the domain we have seen occasions where
> libsas prematurely marks a device gone in the time it takes for the
> device to re-establish the link. This plays badly with software raid
> arrays. Other libsas drivers have non-uniform delays in their reset
> handlers to try to cover this condition, but not sufficient to close the
> hole. Given that a sata device can take many seconds to recover we
> filter bcns and poll for the device reattach state before notifying
> libsas that the port needs the domain to be rediscovered. Once this has
> been proven out at the lldd level we can think about uplevelling this
> feature to a common implementation in libsas.
>
That's the second time something like this have come up now.
Wouldn't it makes sense to implement something like the dev_loss_tmo
mechanism with have for FC? That should cover this situation nicely ...
Cheers,
Hannes
--
Dr. Hannes Reinecke zSeries & Storage
hare@suse.de +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: J. Hawn, J. Guild, F. Imendörffer, HRB 16746 (AG Nürnberg)
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next prev parent reply other threads:[~2011-06-27 14:34 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-24 19:48 [RFC PATCH] isci: filter broadcast change notifications during SMP phy resets Dan Williams
2011-06-27 14:34 ` Hannes Reinecke [this message]
2011-06-27 14:49 ` Brian King
2011-06-27 15:59 ` Douglas Gilbert
2011-06-27 16:27 ` Dan Williams
2011-06-27 16:02 ` James Bottomley
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