VxVM vxdisk - Device is in use as a EFI disk

Problem

# /etc/vx/bin/vxdisksetup -i c12t0d1
VxVM vxdisk ERROR V-5-1-3422 Device c12t0d1 is in use as a EFI disk.

Solution

The disk header can removed by "dd":

# dd if=/dev/zero of=/dev/rdsk/c12t0d1 bs=512k count=4096
4096+0 records in
4096+0 records out