By default, vxunreloc attempts to move hot-relocated subdisks to their original offsets. However, vxunreloc fails if any subdisks already occupy part or all of the area on the destination disk. In such a case, you have two choices:
Move the existing subdisks somewhere else, and then re-run vxunreloc.
Use the -f option provided by vxunreloc to move the subdisks to the destination disk, but leave it to vxunreloc to find the space on the disk. As long as the destination disk is large enough so that the region of the disk for storing subdisks can accommodate all subdisks, all the hot-relocated subdisks will be unrelocated without using the original offsets.
Assume that mydg01 failed and the subdisks were relocated and that you want to move the hot-relocated subdisks to mydg05 where some subdisks already reside. You can use the force option to move the hot-relocated subdisks to mydg05, but not to the exact offsets:
# vxunreloc -g mydg -f -n mydg05 mydg01