From mboxrd@z Thu Jan 1 00:00:00 1970 From: Douglas Gilbert Subject: Re: Can LSISAS1068E chip be configured as a x8 wide port? Date: Sat, 27 Jun 2009 14:23:24 -0400 Message-ID: <4A46639C.2070404@interlog.com> References: <200906271859275463726@gmail.com> Reply-To: dgilbert@interlog.com Mime-Version: 1.0 Content-Type: text/plain; charset=gb2312 Content-Transfer-Encoding: 7bit Return-path: Received: from firefly.infotech.no ([82.134.31.146]:54872 "EHLO elrond.bb.infotech.no" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1750821AbZF0SX2 (ORCPT ); Sat, 27 Jun 2009 14:23:28 -0400 In-Reply-To: <200906271859275463726@gmail.com> Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: "wenshuang.ma" Cc: Eric , linux-scsi wenshuang.ma wrote: > Hi, > > LSISAS1068E is a 2 ports(total 8 PHY) SAS controller with per port can be > configured as a 4 PHY SAS wide port,with the usage of arbitrary one > port LSISAS1068E can control a SAS expander through a MiniSASx4 to > SASx4 cable,we get 4 connections simultaneously.Is it possible for > LSISAS1068E to control one SAS expander through two MiniSASx4 to SASx4 > cables so we can have 8 connections simultaneously(more bandwidth) > if not,why? During my experiments I tried something like that and couldn't get a wide port wider than 4 phys. I think the reason was that each group of 4 phys has a different initiator port identifier (SAS address) seen from the expander. You could check that with smp_discover (in my smp_utils package). Or perhaps there was another reason (e.g. perhaps the expander didn't support it). It didn't work anyway. Can LSI's SAS-2 chips do 8 (phy) wide ports? Note: What SCSI/SAS calls a "port" and LSI's usage of that term is a bit different. For example you want two "LSI" ports to act as one SCSI port. Doug Gilbert