From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hannes Reinecke Subject: Re: [PATCH RFC 0/9] [SCSI] Enhanced sense and Unit Attention handling Date: Mon, 28 Jan 2013 16:48:48 +0100 Message-ID: <51069DE0.4010006@suse.de> References: <1358526434-1173-1-git-send-email-emilne@redhat.com> <51011D2E.305@suse.de> <5106939E.1010301@tributary.com> <51069CC8.3000103@acm.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from cantor2.suse.de ([195.135.220.15]:42324 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751882Ab3A1Psu (ORCPT ); Mon, 28 Jan 2013 10:48:50 -0500 In-Reply-To: <51069CC8.3000103@acm.org> Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: Bart Van Assche Cc: Jeremy Linton , "Ewan D. Milne" , "linux-scsi@vger.kernel.org" On 01/28/2013 04:44 PM, Bart Van Assche wrote: > On 01/28/13 16:05, Jeremy Linton wrote: >> What I think your looking for is RSCN (Registered State Change >> notification). >> Hook that, and then check the name server. This will tell you when >> ports get >> added/removed. You can then report luns against lun 0 of all the >> known target >> ports. This allows you to transparently detect changes. >> >> Otherwise, you run the risk of trapping UA's in the lower level >> portions of >> the stack that _REALLY_ need to be propagated to the controlling >> driver or >> application. > > Thanks for the feedback. Unfortunately sending an RSCN is only > possible when using Fibre Channel as transport layer. I'm looking > for a solution that also works with other SCSI transports, e.g. > iSCSI and SRP. > And we're already doing that. Rather, the FC HBAs do exactly this. So the proposal would be to export a 'virtual' LUN0 if none is=20 present, so that we always have a device to talk to, right? Shouldn't be too hard; we already create a 'virtual' LUN0 during=20 scanning, only we delete it if no LUNs are found. So we're already doing this, only we don't tell :-) Cheers, Hannes --=20 Dr. Hannes Reinecke zSeries & Storage hare@suse.de +49 911 74053 688 SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 N=FCrnberg GF: J. Hawn, J. Guild, F. Imend=F6rffer, HRB 16746 (AG N=FCrnberg) -- 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