Date: Wed, 09 May 2001 15:59:44 -0700 From: Drew Tomlinson <drewt@writeme.com> To: 'Walter Betancourt' <walt@betan.com>, PC Doc <pc-doc@worldnet.att.net> Cc: freebsd-questions@freebsd.org Subject: RE: Use DD to make image copy of dual boot drive? Message-ID: <BA5D0CE1CBB2D411B6AA00A0CC3F02390AF9CB@ldcmsx01.lc.ca.gov> In-Reply-To: <4.2.2.20010509170845.00bbec70@pop3.palace.net>
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What is the preferred method of doing this with non-identical disks? For example, I plan to move my system from it's current box to a different box. I want to take the existing IDE drives and install them in the new box. Then I want to create an exact duplicate of my current file system on a larger SCSI drive that will be in the new box. Then I hope to remove the IDE drives and run from the cloned SCSI drive. Is dd still the best method? Thanks, Drew > -----Original Message----- > From: Walter Betancourt [mailto:walt@betan.com] > Sent: Wednesday, May 09, 2001 2:14 PM > To: PC Doc > Cc: freebsd-questions@freebsd.org > Subject: Re: Use DD to make image copy of dual boot drive? > > > Having been told that dd can make a bootable identical copy > if both drives have > > the same geometry, > > I did sucessfully dd if=/dev/ad0 of=/dev/fd1 with 2 WD > 10.2 GB drives > (same model) > > setup as master and slave. > > 12 hours later I had an identical system running with the > cloned hard drive. > > > > At 01:54 PM 5/9/01 -0700, you wrote: > >Hi, > > > >I have what's probably a dumb question, so please forgive my > ignorance. > > > >I have a FreeBSD system (2.2.8, yes, I know it's old, it's > getting rebuilt > >as soon as 4.3 seems to settle down) that is dual booted > with Windows 98 on > >the first partition and FreeBSD 2.2.8 on the second. > > > >I have two seemly identical 6.4 GB drives. One is WD and the > other is a > >Quantum. Both show exactly the same number of cylinders, > heads, SPT, and > >total number of sectors. I'd like to make a complete image > copy (roughly) of > >the primary drive (wd0) to the second drive (wd1), which > would include both > >the 98 and the FreeBSD partition. > > > >Can I do this using DD? Assuming I could boot into an > "emergency" shell, is > >that a "memory" file system for root? Meaning both of the > two file systems / > >and /usr would be synced and closed. > > > >I've tried Drivecopy 4, disabling the smart sector copy so > it should copy > >everything, but it gets an error part of the way into the > FreeBSD partition, > >and I've had the system reboot when I get to a certain point > in a tape > >backup. Something's probably wrong either with the disk or > the file system, > >but I see any errors in the log (that I can recognize as errors) > > > >Is copying the whole disk, sector by sector doable with DD? > What would the > >command be? I think the 'c' partition refers to the whole > disk so I would > >guess something like: > > > >dd if=/dev/rwd0c of=/dev/rw1c bs=??? > > > >I'm not sure about the devices and what would be a good > block size. Do I > >need to use 512 bytes? The disks say: 32-bit mult-block-16 > so that that mean > >an "efficient" block size would be 16x512? Or would a track > (63x512) be > >better? > > > >Any clues for the clueless would be greatly appreciated. > I'll get the hang > >of this yet! > > > >Thanks, > >Mark > > > > > > > >To Unsubscribe: send mail to majordomo@FreeBSD.org > >with "unsubscribe freebsd-questions" in the body of the message > > Walt > > > 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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