From owner-freebsd-hackers Wed Sep 20 15: 2:39 2000 Delivered-To: freebsd-hackers@freebsd.org Received: from rover.village.org (rover.village.org [204.144.255.49]) by hub.freebsd.org (Postfix) with ESMTP id 4466337B422; Wed, 20 Sep 2000 15:02:31 -0700 (PDT) Received: from harmony.village.org (harmony.village.org [10.0.0.6]) by rover.village.org (8.9.3/8.9.3) with ESMTP id QAA02271; Wed, 20 Sep 2000 16:02:28 -0600 (MDT) (envelope-from imp@harmony.village.org) Received: from harmony.village.org (localhost.village.org [127.0.0.1]) by harmony.village.org (8.9.3/8.8.3) with ESMTP id QAA50356; Wed, 20 Sep 2000 16:02:10 -0600 (MDT) Message-Id: <200009202202.QAA50356@harmony.village.org> To: Edward Elhauge Subject: Re: Frustration with SCSI system Cc: freebsd-hackers@FreeBSD.ORG, freebsd-isp@FreeBSD.ORG In-reply-to: Your message of "Wed, 20 Sep 2000 12:58:27 PDT." <200009201958.MAA45703@ns2.uncanny.net> References: <200009201958.MAA45703@ns2.uncanny.net> Date: Wed, 20 Sep 2000 16:02:10 -0600 From: Warner Losh Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG In message <200009201958.MAA45703@ns2.uncanny.net> Edward Elhauge writes: : to autorecover on bad sectors, but every system that I've had to recover : seems to be in a state where the bad sectors aren't remapping. I've tried I've often wanted to write a bad block remapper. While SCSI is supposed to do this automatically, I've found that a scan on any adaptec controller will remap these blocks (forces the remapping). About 10% of the time that's all a drive with this problem needs to survive indefinitely. The other 90% of the time the disk is about to go tits up in a heap big time way and warrantee replacement is recommended. About 75% of the time a rescan + immmediate dump will save me. I've had 2 disks that seem to have lost their bad block mappings that the adaptec verify function has saved me from sending them back (they were out of warantee anyway). However, on the other 20ish disks I've tried this on have died within days of doing this. Even if we had bad144 support, the drive will need so many bad blocks remapped in a short period of time that it isn't worth while. Finally, I've found that climate controlled and dust free environments help a lot. RAID hardware/software is definitely the right way to deal when you go to the next level. Warner To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message