From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joel Becker Subject: Re: [patch for playing] Patch to support 4000 disks and maintain Date: Fri, 11 Apr 2003 11:35:43 -0700 Sender: linux-scsi-owner@vger.kernel.org Message-ID: <20030411183543.GA31739@ca-server1.us.oracle.com> References: <200304101339.49895.pbadari@us.ibm.com> <20030411154450.GW31739@ca-server1.us.oracle.com> <200304110928.32978.pbadari@us.ibm.com> <20030411175736.GY31739@ca-server1.us.oracle.com> <20030411111232.A7756@beaverton.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from inet-mail1.oracle.com ([148.87.2.201]:5791 "EHLO inet-mail1.oracle.com") by vger.kernel.org with ESMTP id S261528AbTDKTGT (for ); Fri, 11 Apr 2003 15:06:19 -0400 Content-Disposition: inline In-Reply-To: <20030411111232.A7756@beaverton.ibm.com> List-Id: linux-scsi@vger.kernel.org To: Patrick Mansfield Cc: Badari Pulavarty , Giuliano Pochini , linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, Mike Anderson On Fri, Apr 11, 2003 at 11:12:32AM -0700, Patrick Mansfield wrote: > I'm trying to pull the current multi-path patch up to 2.5.66 (ouch). I wasn't aware of this work. This is very interesting. Two questions: 1) When does it failover? Meaning, if I I/O to a disk, but someone yanks the fibrechannel plug. Does your multipath wait for a SCSI timeout to redirect the I/O? 2) If so, have you considered trapping loop up/down events to handle such a case? Real users of multipath tech do not want to wait 90s for failover. Joel -- "Win95 file and print sharing are for relatively friendly nets." - Paul Leach, Microsoft Joel Becker Senior Member of Technical Staff Oracle Corporation E-mail: joel.becker@oracle.com Phone: (650) 506-8127