Date: Sat, 17 Mar 2001 11:52:43 -0500 From: "Dave VanAuken" <dave@hawk-systems.com> To: "Freebsd Questions" <freebsd-questions@FreeBSD.ORG> Subject: RE: hdd mirror Message-ID: <DBEIKNMKGOBGNDHAAKGNIENBEEAA.dave@hawk-systems.com> In-Reply-To: <3AB3832F.15B335BE@pacbell.net>
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especially wise use of dump's features... we do a dump level 0 weekly, and incremential dump level 1's nightly (or more often for critical partitions). This allows us to use the disk bandwidth wisely durig the day, and use low usage hours of the morning to perform the "imaging" tasks. Helps if you have large HDD (or vinum two smaller ones together) as the backup location (we mount as /backup) that wil give you space to dump 0 he whoel system ,and maintain several dump 1 updates without running into storage problems. In short, yes, look at dump :) Dave -----Original Message----- From: owner-freebsd-questions@FreeBSD.ORG [mailto:owner-freebsd-questions@FreeBSD.ORG]On Behalf Of richard childers Sent: Saturday, March 17, 2001 10:31 AM To: Chris Smith Cc: G. Jason Middleton; Freebsd Questions Subject: Re: hdd mirror 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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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