NFS Services Administrator Guide (5900-3045, March 2013)

users@domain
Or
group@domain
Where:
users
specifies the string representation of the user
group
specifies the string representation of the group
domain
specifies a registered DNS domain or a sub-domain of a registered domain
However, UNIX systems use integers to represent users and groups in the underlying filesystems
stored on the disk. As a result, using string identifiers requires mapping of string names to
integers and back.
The nfsmapid daemon is used to map the owner and owner_group identification attributes
with the local user identification (UID) and group identification (GID) numbers, which are used
by both the NFSv4 server and the NFSv4 client.
On the NFS client, the nfsmapid daemon maps a numeric UID or a numeric GID to a string
representation. On the NFS server, it maps a string representation to a numeric UID or a
numeric GID.
For example, user casey with UID 121212 on an NFSv4 client whose fully qualified name
is system.anydomain.com is mapped to [e-mail]. The NFS client sends
the string representation, [e-mail], to the NFS server. The NFS server maps
the string representation, [e-mail], to the unique ID 121212.
The nfsmapid daemon uses the user and group entries in the /etc/nsswitch.conf file,
to determine which name service to use while converting strings and numerical values and
back.
For information on how to configure the nfsmapid daemon, see nfsmapid(1M).
• File Locking
File locking support is integrated with the NFSv4 protocol. NFSv4 introduces leases for lock
management.
When a server grants a lock to control the access of a file for a specific period of time, it is
called a lease. During the lease period, the server cannot grant conflicting access to another
client.
The lock lease interval can accept values higher than the cache consistency leases. As a result,
the client requires only a smaller number of refreshes. The lease ensures that the client does
not lose the locking state.
If a client refreshes a lock, all locks held by the client with that server are validated. This
reduces the number of lease refreshes by the client from one per lock to one per client for a
specific lease.
For information on configuring NFSv4 for the server, see “Configuring the NFSv4 Server Protocol
Version ” (page 20). For information on configuring NFSv4 for the client, see “Configuring the
NFSv4 Client Protocol Version” (page 34).
Sharing and Unsharing Directories
In HP-UX 11i v3, NFS replaces the exportfs command with the share command. The share
command is used on the server to share directories and files with clients. You can use the unshare
command to disable the sharing of directories with other systems.
New Features in NFS 13