Obtaining support for multiple mksysb operations in NIM

During the allocation of NIM mksysb images, only the file is exported to the NFS clients. However, during mksysb creation, the parent directory is also exported. If you use that filesystem to create a mksysb image of a system while another system is restoring a mksysb image from that filesystem, you will get NFS errors.

To avoid this problem, use the environment variable NIM_MKSYSB_SUBDIRS on the NIM master. When this variable is set to yes, subdirectories are used to separate mksysb images. The subdirectories are transparent to the user, but they provide separate child locations for NFS exporting.