Re: OT: Mirroring via disk image file

From: Hugo Vanwoerkom (hvw59601_at_care2.com)
Date: 10/30/05

  • Next message: Andrew M.A. Cater: "Re: Best way to restrict users to "one" application" 
    To: debian-user@lists.debian.org
Date:  Sun, 30 Oct 2005 15:01:22 -0600

    Roberto C. Sanchez wrote:
    > On Sun, Oct 30, 2005 at 03:15:56PM -0500, Marty wrote:
    >
    >>I plan to mirror then replace a hard drive, using an identical model drive.
    >>
    >>Instead of a device-device copy e.g. "cp /dev/hda /dev/hdb" I hope to do
    >>"cp <old drive> image" followed by cp image <new drive>" where "image" is
    >>a disk image file of the original drive.
    >>
    >>Will the physical sector arrangment be preserved using the intermediate image
    >>file, or is that only possible with the device-device copy? I'm asking here
    >>because don't have the identical drives available to test my theory beforehand.
    >
    >
    > [Assumption, current hard drive is hda, CD-ROM is hdc]
    >
    > If the drives are *exactly* identical,

    *exactly*, can that mean both e.g. 80GB drives?

    you can move your old drive to be
    > the slave on the secondary ide channel, which makes it hdd. Then place
    > the new drive on hda. Boot Knoppix, or another suitable live CD distro,
    > and then do this:
    >
    > dd if=/dev/hdd of=/dev/hda
    >
    > Make absolutely 100% sure that hdd contains the old drive and hda the
    > new drive, or you will obliterate your data with garbage. Also, make
    > sure that you specify `if' and `of' correctly, since `i' and `o' are
    > next to each other on a qwerty keyboard.
    >
    > If you would like to this reasonably quickly, I would recommend enabling
    > DMA on the drives after booting. I believe that Knoppix leaves it off
    > by default since it can cause problems in some rare cases.
    >
    > -Roberto
    > 

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