From owner-freebsd-hackers Fri Jan 5 11:45:18 1996 Return-Path: owner-hackers Received: (from root@localhost) by freefall.freebsd.org (8.7.3/8.7.3) id LAA26843 for hackers-outgoing; Fri, 5 Jan 1996 11:45:18 -0800 (PST) Received: from localhost.cdrom.com (localhost.cdrom.com [127.0.0.1]) by freefall.freebsd.org (8.7.3/8.7.3) with SMTP id LAA26831 Fri, 5 Jan 1996 11:45:13 -0800 (PST) Message-Id: <199601051945.LAA26831@freefall.freebsd.org> X-Authentication-Warning: freefall.freebsd.org: Host localhost.cdrom.com [127.0.0.1] didn't use HELO protocol To: Jaye Mathisen cc: hackers@freebsd.org Subject: Re: LUN support. In-reply-to: Your message of "Fri, 05 Jan 1996 11:40:04 PST." Date: Fri, 05 Jan 1996 11:45:12 -0800 From: "Justin T. Gibbs" Sender: owner-hackers@freebsd.org Precedence: bulk > >I have a RAID box that can support multiple LUN's to appear as multiple >RAID'd disks to the host. Ie, with 10GB of disk after parity, I can make >1 LUN look like a 5GB disk, and 5 more LUN's of 1GB each. Look in sys/scsi to see how to create an entry for your device. It should work. >I'm on a 2940 with FreeBSD 2.1-stable. The 2940 fully supports multiple LUNs. You will see a large performance increate if you use tagged queuing since in the non-tagged case, the driver will only queue one transaction per target (locking out transactions based on the target-lun nexus was too constly down in the sequencer). Upgrade to the latest -stable code and define the AHC_TAGENABLE option in your kernel config file. -- Justin T. Gibbs =========================================== FreeBSD: Turning PCs into workstations ===========================================