Date: Mon, 15 Mar 1999 10:52:35 -0800 From: Julian Elischer <julian@whistle.com> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: Steve Passe <smp@csn.net>, hackers@FreeBSD.ORG Subject: Re: power-off without halt Message-ID: <36ED56F3.5656AEC7@whistle.com> References: <199903151655.JAA28147@Ilsa.StevesCafe.com> <199903151844.KAA01410@apollo.backplane.com>
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Matthew Dillon wrote: > > :Hi, > : > : We are looking at using FreeBSD as an "embedded OS" inside a line > :of instruments we are building. I think I have a handle on all the > :issues except how to cleanly handle shutdown where there is no > :console, and thus no way to send a 'halt' command. The requirement > :is that the user can merely turn off the power, nothing more required. > : > : I can modify the disk setup, kernel/util code as needed, I just need some > :idea for a workable solution. Has anyone delt with this problem before? > : > :-- > :Steve Passe | powered by > :smp@csn.net | Symmetric MultiProcessor FreeBSD > > Well, physically speaking you can't power off a machine that may > be writing to its disk. If it is in the middle of a write, you > *will* lose sectors to hard errors. > > So, typically, the best way to deal with this sort of situation is > to mount the disk read-only and never write to it. Or to not have a > disk at all. Or to use a pcmcia type flash disk. > > -Matt > Matthew Dillon > <dillon@backplane.com> > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-hackers" in the body of the message look at : http://www.whistle.com/ I can guide you on a lot of the issues as we've had to handle them.... julian To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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