From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thomas Meller Subject: finding out about QLogic features Date: Mon, 23 Aug 2004 13:10:04 +0200 Sender: linux-scsi-owner@vger.kernel.org Message-ID: <4129D08C.CF43CF96@gmx.net> Reply-To: thomas.meller@gmx.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Return-path: Received: from sbbmail1.sbb.ch ([193.192.251.19]:39113 "EHLO sbbmail1.sbb.ch") by vger.kernel.org with ESMTP id S263640AbUHWLLI (ORCPT ); Mon, 23 Aug 2004 07:11:08 -0400 Received: from intmail1.sbb.ch (intmail1.sbb.ch [10.104.27.189]) by sbbmail1.sbb.ch (Switch-3.1.6/Switch-3.1.0) with ESMTP id i7NBB1TP024957 (version=TLSv1/SSLv3 cipher=EDH-RSA-DES-CBC3-SHA bits=168 verify=FAIL) for ; Mon, 23 Aug 2004 13:11:01 +0200 Received: from gmx.net (i34390.sbb.ch [147.78.17.245]) by intmail1.sbb.ch (Switch-3.1.6/Switch-3.1.6) with ESMTP id i7NBAx0R017133 for ; Mon, 23 Aug 2004 13:11:00 +0200 List-Id: linux-scsi@vger.kernel.org To: linux-scsi@vger.kernel.org My colleagues are going to hang me if my system produces further path failovers. I use a QLogic 2312-based HBA (FastT FC2-133) in failover mode on a LinuX HA-cluster. Everything works fine, but the driver causes several failovers per day without an urgent reason. We're using a FastT 700 via McData fabric switches. Driver version 6.06-fo, Firmware 1.25, Kernel 2.4.18. Maybe I need to tune the driver's parameters to extend some timeouts. Maybe it's as simple as an upgrade. I found out that a FastT requires more retries than are set by default. QLogic support has given me some hints what to cause the scsi subsystem to do. In short: I have to set a bigger retry count when a device proclaims a not-ready condition. >>From my experience it is best to understand first how it works before setting weird parameters. Especially due to the use within a failover cluster it could cause timing problems. Are there any docs around to make a non-programmer understand the HBA-sd_mod interaction technique and it's implications? Is this the right mailing list for me? Thanks in advance -- Thomas Meller mailto: thomas.meller@t-systems.ch mailto: thomas.meller@gmx.net ---- ...Our continuing mission: To seek out knowledge of C, to explore strange UNIX commands, and to boldly code where no man page has ever been seen