Date: Sat, 17 Mar 2001 07:30:55 -0800 From: richard childers <fscked@pacbell.net> To: Chris Smith <chrissmith@mgci.com> Cc: "G. Jason Middleton" <gmiddl1@gl.umbc.edu>, Freebsd Questions <freebsd-questions@FreeBSD.ORG> Subject: Re: hdd mirror Message-ID: <3AB3832F.15B335BE@pacbell.net> References: <Pine.SGI.4.31L.02.0103142230520.359819-100000@irix1.gl.umbc.edu> <007e01c0ad6e$5e2eb120$0c00a8c0@amgroupadmin.com>
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If you are going to back up filesystems do not use dd(1). This will copy bad blocks, and it does not have error detection. I recommend dump(8); I know it works because when I was at AMPEX R&D I created a mirror to preserve the Video Systems Division's server's data by doing exactly this, every morning at 0200, seven days a week. (The system would reboot at 0200, then an entry in /etc/rc.local - this was SunOS 3.x - would do a dump of the entire disk [disk-sized filesystem; the director liked monoliths :-] and pipe it into a restore(8), on the spare drive. We'd evaluated Ciprico controllers - they were brand new, the CEO himself came to meet with us, he was the sole employee at that time - but they were too expensive, for what could be done with a shellscript, once a day, instead.) (This was around 1988; my gig at AMPEX ended with the big earthquake, in 1989.) -- richard Chris Smith wrote: > If the data on your drive doesn't change too often, you might also try > the lazy man's mirror: dd and cron once a day > _________________________________________________________________________ > Chris Smith American Group Administrators > IT Department First National Administrators > > ----- Original Message ----- > From: "G. Jason Middleton" <gmiddl1@gl.umbc.edu> > To: <freebsd-questions@freebsd.org> > Sent: Wednesday, March 14, 2001 7:32 PM > Subject: hdd mirror > > > does anyone on the list mirror their hdd(s) in freebsd? > > > > If so how are you going about it? > > > > Regards, > > > > G. Jason Middleton > > > > > > > ____________________________________________________________________________ > ___ > > > > > > > > > > > > > > Announcement: > > > > The revolution will not be televised. > > > > > > > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > > with "unsubscribe freebsd-questions" in the body of the message > > > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-questions" in the body of the message -- Richard A. Childers Senor UNIX Administrator fscked@pacbell.net (email) 415.664.6291 (voice/msgs) # Providing administrative expertise (not 'damage control') since 1986. # PGP fingerprint: 7EFF 164A E878 7B04 8E9F 32B6 72C2 D8A2 582C 4AFA To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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