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System Administration Guide: Devices and File Systems

Cloning a Disk with an EFI Label

In previous Solaris releases, slice 2 (s2) was used to represent the whole disk. You could use the dd command to clone or copy disks by using syntax similar to the following:


dd if=/dev/rdsk/c0t0d0s2 of=/dev/rdsk/c0t2d0s2 bs=128k

Now, you must use a slightly different procedure to clone or copy disks larger than 1 terabyte so that the UUID of cloned disks are unique. For example:

  1. Use the dd command to clone the disk with an EFI label:


    # dd if=/dev/rdsk/c0t0d0 of=/dev/rdsk/c0t2d0 bs=128k

  2. Pipe the prtvtoc output of the disk to be copied to the fmthard command to create a new label for the cloned disk.


    # prtvtoc /dev/rdsk/c0t0d0 | fmthard -s - /dev/rdsk/c0t2d0
Caution – Caution –

If you do not create a new label for the cloned disk, other software products might corrupt data on EFI-labeled disks if they encounter duplicate UUIDs.