Date: Sat, 1 Dec 2007 23:25:56 -0500 From: Jerry McAllister <jerrymc@msu.edu> To: Steve Franks <stevefranks@ieee.org> Cc: User Questions <freebsd-questions@freebsd.org> Subject: Re: using dd to duplicate disks/partitions of slightly different sizes - works? Message-ID: <20071202042556.GB99512@gizmo.acns.msu.edu> In-Reply-To: <539c60b90712010929m7fef7020v806eb3c1eb24d066@mail.gmail.com> References: <539c60b90712010929m7fef7020v806eb3c1eb24d066@mail.gmail.com>
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On Sat, Dec 01, 2007 at 10:29:15AM -0700, Steve Franks wrote: > I've got two 160GB disks. Different manufacturers, so different # > bytes. One is FreeBSD, the other blank. I'd like to backup my system > for the fastest possible recovery after a crash - move the plug and > power up. I have gmirrored before, but I just wanted to do a quick > dd, since I don't want to abuse my cheapo powersupply (has 4 disks > already on it). > > Two questions: > > (1) If I dd from the smaller to the larger, will it work? What > happens to the extra, say 5MB of unused space - will my partition info > be messed up? > > (2) If I dd from the larger to the smaller (df reports only 50% used > anyway) is there a way to make sure there is no info in the 5MB at the > end that will overflow the smaller, and again, will my partitions be > ok? > > The other option is just to fdisk & label the other disk, then rsync > everything to it. Is that the wiser choice? Either rsync or dump/restore. skip the dd. It is not a good use of dd. ////jerry > > Thanks, > Steve > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org"
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