HFS directories under MPE groups can be located on
non-system volume sets. But, HFS directories under the root
and accounts must reside on the system volume.
High-availability products, such as Mirrored Disk,
Autorestart, and SPU Switchover, are restricted to non-
system volume sets; therefore, they cannot support HFS
directories under the root or accounts. These products only
support HFS directories as descendants of MPE groups.
As a workaround, symbolic links can be used to "redirect"
directories from under root or an account to a group that is
located on a user volume set.
