From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ravi Shankar Subject: Re: mpt2sas: /sysfs sas_address entries do not show individual port sas addresses. Date: Thu, 18 Aug 2011 10:57:51 -0700 Message-ID: <4E4D529F.9090908@oracle.com> References: <4E4B9B04.10302@mpstor.com> <4E4BDFD7.3060109@interlog.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from rcsinet15.oracle.com ([148.87.113.117]:31425 "EHLO rcsinet15.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751306Ab1HRR6C (ORCPT ); Thu, 18 Aug 2011 13:58:02 -0400 Received: from rtcsinet22.oracle.com (rtcsinet22.oracle.com [66.248.204.30]) by rcsinet15.oracle.com (Switch-3.4.4/Switch-3.4.4) with ESMTP id p7IHvxUN019902 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Thu, 18 Aug 2011 17:58:01 GMT Received: from acsmt356.oracle.com (acsmt356.oracle.com [141.146.40.156]) by rtcsinet22.oracle.com (8.14.4+Sun/8.14.4) with ESMTP id p7IHvvSX022311 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Thu, 18 Aug 2011 17:57:58 GMT Received: from abhmt109.oracle.com (abhmt109.oracle.com [141.146.116.61]) by acsmt356.oracle.com (8.12.11.20060308/8.12.11) with ESMTP id p7IHvq0w015316 for ; Thu, 18 Aug 2011 12:57:52 -0500 In-Reply-To: <4E4BDFD7.3060109@interlog.com> Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org Cc: "linux-scsi@vger.kernel.org" > > > Do you know a reason why it is not preferably for every > phy on a SAS HBA to respond with the same SAS address? > > > As a practical matter a SAS HBA needs a single SAS address, > preferably printed on the board or its box. Then if you > manage to wipe its SAS address (e.g. by erasing its flash > to move from IR to IT firmware) then you know which SAS > address to re-instate :-) > HBA SAS phy could have same SAS address when they are directly connected. however when connected to expanders, each logical port/phy need unique SAS address.