From owner-freebsd-questions Mon Dec 9 10:54:32 1996 Return-Path: Received: (from root@localhost) by freefall.freebsd.org (8.8.4/8.8.4) id KAA21436 for questions-outgoing; Mon, 9 Dec 1996 10:54:32 -0800 (PST) Received: from hda.hda.com (ip93-max1-fitch.ziplink.net [199.232.245.93]) by freefall.freebsd.org (8.8.4/8.8.4) with SMTP id KAA21431 for ; Mon, 9 Dec 1996 10:54:26 -0800 (PST) Received: (from dufault@localhost) by hda.hda.com (8.6.12/8.6.12) id BAA00222; Sun, 8 Dec 1996 01:25:03 -0500 From: Peter Dufault Message-Id: <199612080625.BAA00222@hda.hda.com> Subject: Re: Marking Bad Blocks In-Reply-To: from Cliff Addy at "Dec 7, 96 08:04:01 am" To: fbsdlist@revelstone.jvm.com (Cliff Addy) Date: Sun, 8 Dec 1996 01:25:03 -0500 (EST) Cc: nc@ai.net, questions@FreeBSD.ORG X-Mailer: ELM [version 2.4ME+ PL25 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-questions@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk > On Fri, 6 Dec 1996, Network Coordinator wrote: > > > We are seeing errors like this on one of our lab systems: > > > > sd0(ahc0:0:0): MEDIUM ERROR info:396e24 asc:11,0 Unrecovered read error > > We had the same problem, repeatedly, with an Adaptec 2940W and several > Micropolis drives. Never found a solution. The same question you just > asked never got a reply in any forum. Finally just tossed both in favor > of a 2940UW and a Quantum drive (yesterday). Now we'll see if it was the > equipment or if it's an inherent flaw in fbsd. This is a FAQ. I went through the trouble of starting to modify the HTML FAQ to answer this and netscape-gold hung up so I quit. The short answer is that unrecovered read errors aren't reallocated by the disk drive firmware by the SCSI spec, and the OS can't do it since it doesn't know what to put there (remember - it can't read that block). Check the drive's mode page 1 (this part is in the FAQ) to make sure AWRE and ARRE are on to enable reallocation, and then restore the partition. -- Peter Dufault Real-Time Machine Control and Simulation HD Associates, Inc. Voice: 508 433 6936 dufault@hda.com Fax: 508 433 5267