QuickSpecs

Enables cloning – enable the application to remain online during backup by creating a read-only copy (clone) of an
active fileset.
Performance tuning, such as striping files across multiple volumes to improve read/write performance, balancing the
domain to even out the percentage of free space among the volumes of a multivolume file domain, and migration to
optimize disk usage.
Enables creating a trashcan directory to store files that are deleted.
Full support for hardware-initiated cloning and snapshot based 3
rd
party backup solutions.
Takes advantage of physical storage volume growth.
See the LAYERED PRODUCTS section of these QuickSpecs for more information on AdvFS Utilities.
UNIX File System (UFS)
UFS is based on the UNIX Fast File System (FFS) and is compatible with the Berkeley 4.3 Tahoe release.
Network File System (NFS)
Tru64 UNIX NFS V2 allows transparent file access over TCP/IP networks. The Network Information System (NIS) is
provided for centralized system management of files. The automount service automatically mounts and unmounts NFS file
systems. AutoFS provides the same services as the automount daemon but provides greater scalability and improved
performance. The NFS locking service allows advisory and record locks to be used with remotely mounted files. Automount
will be retired in a future release of the operating system. Instructions for migrating from automount to autofs have been
provided in the Network Administration: Services Guide. Additional instructions for migrating from automount to autofs in a
cluster can be found in the TruCluster Server Release Notes.
Tru64 UNIX provides an NFS V3 server and client protocol implementation in addition to V2. NFS V3 includes 64-bit support
for file access, exclusive create semantics, negotiable transfer sizes, safe asynchronous writes, added support for access
checking, and other changes designed to increase efficiency and performance. NFS file systems can use either the UDP or
TCP transport protocols.
Network Lock Manager (NLM) V4 includes support for files larger than 2 GB. Support for additional over-the-wire error code
is also provided. NLM V3 is supported for NFS V2 compatibility.
V2 PC-NFS server support is provided to enable connectivity from PC-NFS 5.1B, V5.1A, 5.1, 4.0, and 3.5 clients.
Memory File System (MFS)
The Tru64 UNIX MFS is a memory-based UFS. The MFS has the same file system structure as the UFS, but resides in
virtual memory. No permanent file structures or data are written to disk, so the contents of an MFS file system are lost as the
result of a reboot, an unmount, or a power failure. MFS is useful for temporary files or for read-only files that are copied in
after the MFS has been created.
QuickSpecs
HP Tru64 UNIX Operating System Version V5.1B
File Systems
DA - 11939 U.S. QuickSpecs — Version 1 — 4/8/2004 Page 9