The z/OS NFS server does not support updating or extending a PDS or PDSE member directly. To update or extend a PDS or PDSE member, a client program must follow these steps.

1. Copy the file to the client machine
2. Update or extend the copied version on the local system
3. Truncate the original MVS file to zero size by sending a SETATTR request with zero file size
4. Copy the updated version on the local host to MVS by writing request

Some client editors follow these steps, for example, the AIX and UNIX vi editor. Other editors do not follow these steps, for example, the z/OS UNIX OEDIT editor. In the latter case the user must save the updated version into a new file.