Date: Wed, 15 Sep 1999 06:13:05 -0700 From: Graeme Tait <graeme@echidna.com> To: Woody Carey <carey@roguewave.com>, questions@freebsd.org, andriss@andriss.com Cc: info@boatbooks.com Subject: Re: SCSI drive mirroring question Message-ID: <37DF9B61.22D7@echidna.com> References: <EB55BCC162CAD111BD0A00A0C9979E3201944F1E@cvo1.cvo.roguewave.com>
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I've used dd successfully to replicate a drive to an identical drive, and it may well be much faster than file-by-file methods, depending on what is on the drive to be copied (in particular, how full the drive is). BTW, I believe this also copies any boot record, etc. But this was with the source drive mounted read-only. What would happen if dd was used to copy a live filesystem, and when the system wrote a given file, data was written both before and after the current read point for dd? Woody Carey wrote: > > I was under the impression that 'dd' could be used for bit-by-bit copy. > Can anyone second this? > > - Woody > > > > > What I want is a true bit by bit mirror of the entire first drive... > > > > Can anyone suggest something that would do it? > > > > Andriss -- Graeme Tait - Echidna To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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