Force the disk group to be imported by running command:
# vxdg -f import diskgroup
The -f option forces an import if one or more disks are currently unusable or inaccessible. When you use the -f option to force the import of an incomplete disk group, it counts as a successful import. The next time this disk group is imported, the -f option is no longer required. The import completes successfully as long as all the disks in this disk group are accessible.
Warning: Be careful when you use the -f option. It can cause the same disk group to be imported twice from different sets of disks. Consequently, the disk group configuration may become inconsistent.