From owner-freebsd-hackers Fri Oct 1 10:39:21 1999 Delivered-To: freebsd-hackers@freebsd.org Received: from haldjas.folklore.ee (Haldjas.folklore.ee [193.40.6.121]) by hub.freebsd.org (Postfix) with ESMTP id E781715A2E for ; Fri, 1 Oct 1999 10:39:10 -0700 (PDT) (envelope-from narvi@haldjas.folklore.ee) Received: from localhost (narvi@localhost) by haldjas.folklore.ee (8.9.3/8.9.3) with SMTP id UAA20464; Fri, 1 Oct 1999 20:38:48 +0300 (EEST) (envelope-from narvi@haldjas.folklore.ee) Date: Fri, 1 Oct 1999 20:38:48 +0300 (EEST) From: Narvi To: jin@george.lbl.gov Cc: hackers@FreeBSD.ORG Subject: Re: SCSI disk naming problem In-Reply-To: <199910011710.KAA18313@george.lbl.gov> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG See LINT on details of how to wire down scsi devices... Your proposal doesn't take adding a second scsi card into account. On Fri, 1 Oct 1999 jin@george.lbl.gov wrote: > Current FreeBSD SCSi disk naming mechanism is problem for using more than > one disks in the chain during the disk failure. > > The problem is that the name is not fixed with is SCSI ID. e.g., > if one disk is presented in the chain, regardless its SCSI ID, it is > always named "da0"; > > if two disks are installed, the one with lower ID is named da0 and the > other will be named as da1. When the lower ID one is crashed, then the > other disk will be named as da0 (from da1) after reboot, and it is not > mountable due to the name changing. > > If a system has a UW SCSI controller with 15 disks in the chain, > when the first disk (ID = 0) crashed, all rest 14 disks will be > useless until either fstab modified or another disk is added with > SCSI ID = 0. > > Why not we use a fixed name corresponding the SCSI ID. That is, > disk with ID 0 will be always named as da0, and disk with ID 1 > will be always named da1, etc.? > > Is there problem with fixed disk naming mechanism? > > -Jin > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-hackers" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message