DFSMS/VM and SFS File Management
DFSMS/VM is an optionally-installed facility of z/VM that can help automate storage management tasks for SFS files. Files can be assigned attributes that tell DFSMS/VM how long to maintain the file. Files can be automatically deleted or moved to DFSMS/VM-owned storage automatically, to more efficiently use the available storage.
You may want to ask your SFS administrator if DFSMS/VM has been installed on your system and is being used to manage SFS files, because this can affect the behavior of files in an SFS file pool. (See z/VM: DFSMS/VM Planning Guide for an explanation of how this product is used.)