From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hannes Reinecke Subject: Re: [RFC PATCH] isci: filter broadcast change notifications during SMP phy resets Date: Mon, 27 Jun 2011 16:34:20 +0200 Message-ID: <4E0894EC.2010509@suse.de> References: <20110624194109.26706.58553.stgit@localhost6.localdomain6> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from cantor2.suse.de ([195.135.220.15]:48779 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750979Ab1F0OeY (ORCPT ); Mon, 27 Jun 2011 10:34:24 -0400 In-Reply-To: <20110624194109.26706.58553.stgit@localhost6.localdomain6> Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: Dan Williams Cc: linux-scsi@vger.kernel.org, Dave Jiang , dmilburn@redhat.com, jack_wang@usish.com, Jeff Skirvin , yuxiangl@marvell.com, hch@lst.de On 06/24/2011 09:48 PM, Dan Williams wrote: > From: Jeff Skirvin > > When resetting a sata device in the domain we have seen occasions whe= re > 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=20 mechanism with have for FC? That should cover this situation nicely ... Cheers, Hannes --=20 Dr. Hannes Reinecke zSeries & Storage hare@suse.de +49 911 74053 688 SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 N=C3=BCrnberg GF: J. Hawn, J. Guild, F. Imend=C3=B6rffer, HRB 16746 (AG N=C3=BCrnberg= ) -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html