From owner-freebsd-questions Sat May 2 20:06:41 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id UAA11752 for freebsd-questions-outgoing; Sat, 2 May 1998 20:06:41 -0700 (PDT) (envelope-from owner-freebsd-questions@FreeBSD.ORG) Received: from gdi.uoregon.edu (gdi.uoregon.edu [128.223.170.30]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id UAA11726 for ; Sat, 2 May 1998 20:06:29 -0700 (PDT) (envelope-from dwhite@gdi.uoregon.edu) Received: from localhost (dwhite@localhost) by gdi.uoregon.edu (8.8.7/8.8.8) with SMTP id UAA21517; Sat, 2 May 1998 20:06:29 -0700 (PDT) (envelope-from dwhite@gdi.uoregon.edu) Date: Sat, 2 May 1998 20:06:29 -0700 (PDT) From: Doug White Reply-To: Doug White To: Steve Sims cc: questions@FreeBSD.ORG Subject: RE: Monitoring disk access In-Reply-To: <000001bd7457$5b51b4a0$64468094@Elvis.RatsNest.VaBeach.Va.Us> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Thu, 30 Apr 1998, Steve Sims wrote: > Doug - Do I interpret you correctly: If APM is enabled in the kernel, it > explicitly prohibits the drive(s) from spinning down? I think so, yes. > If I'm reading you correctly, the Power Management stuff *should* (not to > infer that somebody ought to make it so) allow the drives to idle down and > extend the "interrupt timeout" that you mention. Actually no -- FreeBSD has a cow about it. Some people (probably committers) complained about it spinning down and thus stuck the option in. I think there is an override option that doesn't disable spindown, you'll have to check the wdc.c code in the kernel. > A couple of years back, I was playing with one of the first "green machines" > I'd ever seen (and it did let the drives spin down). When the disk was hit, > it would (often) bark about timeouts, but it was innocuous - the FS > integrity was maintained. I hacked (mumble, mumble.... wdc-"something") > that extended the timeouts and it seemed to work pretty good for the few > days that I was farting around. IIRC, this was, like, a 1.1.5 system. I think some computers would take so long to come back that the system would assume a failure condition and return errors, or worse. Doug White | University of Oregon Internet: dwhite@resnet.uoregon.edu | Residence Networking Assistant http://gladstone.uoregon.edu/~dwhite | Computer Science Major To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message