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– File system quota (maximum fi le system size). With
zFS the fi le system quota can be increased with a
simple administrative command.
– Can improve failure recovery. zFS performs asynchro-
nous writes to disk and does not wait for a synch inter-
val to begin writes.
zFS or zFS-related administration, system management,
performance, confi guration support, and scalability have
been further enhanced in z/OS 1.4:
• Dynamic reconfi guration for fi le system confi guration
options
• Dynamic use of secondary allocation for a zFS aggre-
gate (data set) or fi le system
• Improvements in the UNIX System Services automount
support for zFS
• Addition of ISHELL support for zFS
• Ability to perform I/O operations in parallel for a zFS
aggregate that spans multiple DASD volumes. This is
designed to provide improved performance when using
multi-DASD volume aggregates.
• Support for 64-bit user virtual buffer addresses
The Hierarchical File System (HFS) functionality has been
stabilized. HFS is expected to continue shipping as part of
the operating system and will be supported in accordance
with the terms of a customer’s applicable support agree-
ment. IBM intends to continue enhancing zFS functional-
ity, including RAS and performance capabilities, in future
z/OS releases. All requirements for UNIX fi le services are
expected to be addressed in the context of zFS only.
Distributed File Services (DFS) Server Message Block
(SMB)
Microsoft Windows networking compatible fi le and print
serving is available in z/OS with Native SMB File and Print
Serving for Windows Clients. SMB fi le serving enables
z/OS to share HFS, zFS, Sequential fi les and Record Files
Systems (RFS) such as PDS, PDS/E or VSAM data sets
with Windows workstations. SMB can automatically handle
the conversion between ASCII and EBCDIC making full
use of USS fi le tagging Access Control Lists (ACLs) sup-
port. This enhances the ability to develop applications on
Windows and deploy on z/OS. z/OS also supports printing
of SMB fi les without requiring that code be installed on the
clients and without requiring unique printer setup on the
workstations.
SMB Support has been further enhanced in z/OS 1.4 by:
• Simplifi ed user administration with Windows Domain ID
mapping
• Performance improvements with RFS and large PDS or
PDS/E fi le systems
• Exploitation of zFS performance
• Network File System (NFS) acts as a fi le server to work-
stations, personal computers, or other authorized sys-
tems in a TCP/IP network. It also provides a z/OS client.
The remote data sets or fi les are mounted from the
mainframe (z/OS) to appear as local directories and fi les
on the client system. NFS also provides access to the
Hierarchical File System (HFS) and zSeries File System
(zFS).
Internet Services
z/OS Version 1 Release 6 base elements
IBM HTTP Server
z/OS Version 1 Release 6 optional no-charge features
IBM HTTP Server North America Secure