From mboxrd@z Thu Jan 1 00:00:00 1970 From: Douglas Gilbert Subject: Re: [PATCH 2/8] fusion - mptsas, increase discovery timout to 300 seconds Date: Tue, 17 Jan 2006 13:45:11 +1000 Message-ID: <43CC6847.8050708@torque.net> References: Reply-To: dougg@torque.net Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Received: from zorg.st.net.au ([203.16.233.9]:4556 "EHLO borg.st.net.au") by vger.kernel.org with ESMTP id S1751342AbWAQDoo (ORCPT ); Mon, 16 Jan 2006 22:44:44 -0500 In-Reply-To: Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: "Moore, Eric" Cc: linux-scsi@vger.kernel.org Moore, Eric wrote: > Increase the port enable timeout only for SAS from 30 to 300 seconds. > A customer request for the handling large topologies. Eric, I have seen various reports concerning SAS HBAs taking "forever" to initialize/discover (various HBA manufacturers, various OSes). Perhaps you could enlighten me why these timeouts need to be so large. Also if a SAS domain does not contain a fanout expander, doesn't that limit the domain to around 128 or 256 SCSI devices (sum of scsi initiator and target ports)? If so, perhaps the timeout could be one of two values, a larger value if a fanout expander was found in the most recent discover process. Doug Gilbert