From mboxrd@z Thu Jan 1 00:00:00 1970 From: Patrick Mansfield Subject: Re: Fwd: 32bit dev_t Date: Wed, 22 Jan 2003 09:18:15 -0800 Sender: linux-scsi-owner@vger.kernel.org Message-ID: <20030122091815.A32098@beaverton.ibm.com> References: <3E2DC21D.9010204@torque.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <3E2DC21D.9010204@torque.net>; from dougg@torque.net on Wed, Jan 22, 2003 at 08:56:45AM +1100 List-Id: linux-scsi@vger.kernel.org To: Douglas Gilbert Cc: linux-scsi@vger.kernel.org, sdake@mvista.com, Joel.Becker@oracle.com On Wed, Jan 22, 2003 at 08:56:45AM +1100, Douglas Gilbert wrote: > This post appeared recently on the linux kernel list. > What is the maximum number of disks that can be attached > in lk 2.5? Is it 256 (double the number of SCSI disk majors) > or larger. I remember Richard Gooch's "sd-many" patch > was rejected for 2.5 because it was said there was a > better mechanism around the corner. > > BTW when I tested 129 (1 real + 128 dummies) disks with > scsi_debug there was a problem the last one. Has anyone > tested > 128 disks in lk 2.5? > > Doug Gilbert It should be 16 sd majors * 16 disks per major = 256. What was the problem with scsi_debug? I thought you got it past 128 LUNs at some point. There are no longer kmalloc (or vmalloc) issues with sd.c. -- Patrick Mansfield