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nfs.conf(5)                 BSD File Formats Manual                nfs.conf(5)


NAME

     nfs.conf -- The configuration file for NFS


SYNOPSIS

     nfs.conf


DESCRIPTION

     The nfs.conf file contains options used to specify NFS server and client
     configuration and tuning.

     Each line contains an option field and a value field, separated by an
     equals character '='.  For example:

           some.nfs.option = value

     Each line specifies a single option/value pair.  Whitespace can be used
     freely before and after fields.  A hash character '#' begins a comment
     that extends to the end of the line.  Lines containing only whitespace or
     comments are ignored.  The file format is intended to be easily read
     using functions like fparseln(3).

     Values are typically integers.  For options that enable/disable function-
     ality the value zero (0) indicates the option is off/disabled and the
     value one (1) (or any other non-zero value) indicates the option is
     on/enabled.

     The options are:

     nfs.client.access_cache_timeout
              How long (in seconds) that access(2) information is cached.  The
              default is 60 seconds.

     nfs.client.access_for_getattr
              This option specifies if access(2) information should be oppor-
              tunistically fetched every time attributes are fetched.  A
              GETATTR request will only return attributes, but since ACCESS
              requests usually also return current attributes, a single ACCESS
              request may be used to fetch both access(2) information and
              attributes.  Enabling this may improve performance, but only if
              the ACCESS check on the server is inexpensive.  This may not be
              the case with many modern operating systems.  The default is 0
              (off).

     nfs.client.allow_async
              Allow the use of the -o async mount option.  This option must be
              enabled in order for the async mount option to be honored
              because (accidental) use of the async mount option may result in
              data loss if the server crashes.  The default is 0 (off).

     nfs.client.callback_port
              This option can be used to specify a port that the NFSv4 call-
              back RPC service should be available on.  The default value is
              unspecified, which means that any available port will be used.

     nfs.client.initialdowndelay
              When an NFS server is not responding, this option specifies how
              long to wait (in seconds) before the initial notification is
              posted.  The default is 12 seconds.

     nfs.client.iosize
              This option specifies what size (in bytes) the NFS client
              reports for the recommended I/O request size returned in stat(2)
              and statfs(2) calls.  The default value is 1048576 bytes.

     nfs.client.mount.options
              Mount options to be used for NFS file systems mounted via
              mount(8) / mount_nfs(8).  The value is in the same format as the
              argument for the -o mount option (a comma-separated string of
              options like: option1,option2=val,option3).  The default value
              is empty.  These options are processed by mount_nfs(8) prior to
              processing any other command-line options.  Therefore, mount
              options set in the NFS configuration file may be added to or
              overriden by additional command-line options.

     nfs.client.nextdowndelay
              When an NFS server is not responding, this option specifies how
              long to wait (in seconds) between notifications.  The default is
              30 seconds.

     nfs.client.nfsiod_thread_max
              The maximum number of NFS client asynchronous I/O (nfsiod)
              threads to use.  The default is 16.

     nfs.client.statfs_rate_limit
              The maximum number of times per second that an NFS client will
              send a "statfs" RPC request to an NFS server to retrieve up-to-
              date file system information.  Requests for this information
              that occur faster than this rate will receive cached values.
              The default value is 10 times per second.  A value of zero means
              no limit.

     nfs.client.is_mobile
              This option specifies if an NFS client is on a mobile machine.
              On a mobile machine, hard mounted file systems can be automati-
              cally forcibly unmounted if the following is met:
              o   The mount was automounted.
              o   The server is not responding.
              o   No files are open for writing.
              o   No files are memory mapped.
              o   There are no dirty pages associated with the mount.
              The default for this option is to let the system detect this. A
              non-zero value for this option treats this machine as a laptop
              with respect to NFS behavior and allows automatic forcible
              unmounting of unresponsive volumes described above. Conversely,
              a zero value treats the machine as a desktop for traditional NFS
              behavior, where hard mounts never time out. Setting a zero value
              is useful for laptops that are being used as desktops.

     nfs.lockd.grace_period
              This option specifies the grace period (in seconds) during which
              lockd will only accept requests from hosts which are reclaiming
              locks which existed before the restart.  The default value is 45
              seconds.

     nfs.lockd.host_monitor_cache_timeout
              This option tells rpc.lockd how long (in seconds) to cache state
              records for monitored hosts.  Setting it to zero will disable
              the cache which will make lock and unlock requests from a single
              client more expensive because of additional interaction with the
              client's statd.  The default value is 60 seconds.

     nfs.lockd.port
              This option can be used to specify a port that the NFS LOCK ser-
              vice (lockd) should be available on.  The default value is
              unspecified, which means that any available port will be used.

     nfs.lockd.send_using_tcp
              This option tells lockd to use TCP sockets when contacting other
              hosts.  The default value is 0, which means lockd will use UDP.

     nfs.lockd.send_using_mnt_transport
              This option tells lockd to use the socket type of the corre-
              sponding nfs mount. Locking a file on a udp mount will use udp
              and locking a file on a nfs mount mounted with tcp will use tcp.
              Note that nfs.lockd.send_using_tcp will override this option.
              The default value is 0, which means lockd will use UDP provided
              nfs.lockd.send_using_tcp is not set or set to 0.

     nfs.lockd.shutdown_delay_client
              This option species how long (in seconds) the lockd daemon
              should remain running after the unmounting of the last NFS file
              system for which it may need to perform file locking requests.
              The default value is 180 seconds.  (Note: lockd may also remain
              running if it is needed by the NFS server.)

     nfs.lockd.shutdown_delay_server
              This option species how long (in seconds) the lockd daemon
              should remain running after the NFS server daemon, nfsd(8), is
              stopped.  The default value is 180 seconds.  (Note: lockd may
              also remain running if it is needed by any NFS file system
              mounts.)

     nfs.lockd.tcp
              This option specifies whether the LOCK server should support
              connections using TCP.  The default value is 1 (enabled).

     nfs.lockd.udp
              This option specifies whether the LOCK server should support
              connections using UDP.  The default value is 1 (enabled).

     nfs.lockd.verbose
              This option controls how much logging lockd performs.  It cur-
              rently maps directly to the rpc.lockd(8) -d debug_level option.
              The default value is 0.

     nfs.server.async
              This option specifies that the NFS server should report unstable
              writes as stable writes.  The default is 0 (off).  While
              enabling this option can improve write performance, it will also
              put data integrity at risk because the NFS client will be told
              that data is on stable storage before it actually is.  The data
              may be lost if the NFS server crashes.

     nfs.server.bonjour
              This option controls whether the NFS service is advertised via
              Bonjour.  The default value is 1 (on).

     nfs.server.bonjour.local_domain_only
              This option controls whether the NFS service's Bonjour adver-
              tisement is restricted to the local domain only.  The default
              value is 0 (off).

     nfs.server.export_hash_size
              This option specifies the size of the NFS server export hash ta-
              ble.  The default value is 64.

     nfs.server.fsevents
              This option controls whether the NFS server will generate fsev-
              ents for operations performed on an exported file system.  The
              default value is 1 (enabled).

     nfs.server.mount.port
              This option can be used to specify a port that the MOUNT service
              (mountd) should be available on.  The default value is unspeci-
              fied, which means that any available port will be used.

     nfs.server.mount.regular_files
              This option controls whether MOUNT requests for non-directory
              objects will be allowed.  The default value is 0 (off).

     nfs.server.mount.require_resv_port
              This option controls whether MOUNT requests are required to
              originate from a reserved port (port < 1024).  The default value
              is 1 (yes).  Many NFS server implementations require this
              because of the false belief that this requirement increases
              security.

     nfs.server.nfsd_threads
              This option controls how many NFS server (nfsd) threads are made
              available to service NFS requests.  The default value is 8.

     nfs.server.port
              This option can be used to specify a port that the NFS service
              (nfsd) should be available on.  The default value is 2049.

     nfs.server.reqcache_size
              This option specifies the size of the NFS server request cache.
              The default value is 64.

     nfs.server.request_queue_length
              This option specifies the maximum number of NFS requests that
              the NFS server can queue up internally on the NFS server's UDP
              socket.  The default value is 128.  Note: using a large value
              risks getting all the mbufs in the system placed on that queue
              which can cause all networking to hang.

     nfs.server.require_resv_port
              This option controls whether NFS requests are required to origi-
              nate from a reserved port (port < 1024).  The default value is 0
              (no).  Many NFS server implementations require this because of
              the false belief that this requirement increases security.

     nfs.server.rquota.port
              This option can be used to specify a port that the RQUOTA ser-
              vice (rquotad) should be available on.  The default value is
              unspecified, which means that any available port will be used.

     nfs.server.rquota.tcp
              This option specifies whether the RQUOTA server should support
              connections using TCP.  The default value is 1 (enabled).

     nfs.server.rquota.udp
              This option specifies whether the RQUOTA server should support
              connections using UDP.  The default value is 1 (enabled).

     nfs.server.tcp
              This option specifies whether the NFS server should support con-
              nections using TCP.  The default value is 1 (enabled).

     nfs.server.udp
              This option specifies whether the NFS server should support con-
              nections using UDP.  The default value is 1 (enabled).

     nfs.server.user_stats
              This option controls whether the NFS server maintains active
              user statistics.  The default value is 1 (enabled).

     nfs.server.verbose
              This option controls how much logging nfsd performs.  The
              default value is 0 - where only messages up to priority
              LOG_WARNING are logged.  Setting the verbose level to 1 will add
              LOG_NOTICE messages which includes logging failed mount
              attempts.  A verbose level of 2 will increase the log level to
              LOG_INFO which includes logging successful mount attempts.  A
              log level of 3 or more will add LOG_DEBUG messages and cause
              increasing amounts of debug information to be logged.  nfsd's
              verbose level can also be adjusted temporarily using the com-
              mand: nfsd verbose.  Note: the syslog(8) configuration may need
              to be adjusted in order to see the increased verbosity.

     nfs.server.wg_delay
              This option controls how long (in microseconds) NFSv2 writes
              will be gathered up before being processed.  The default value
              is 1000.  Setting this option to 0 will disable write gathering
              for NFSv2.

     nfs.server.wg_delay_v3
              This option controls how long (in microseconds) NFSv3 writes
              will be gathered up before being processed.  The default value
              is 0 (disabled).  NFSv3's support of unstable writes effectively
              eliminates the need for doing write gathering to increase per-
              formance.

     nfs.statd.port
              This option can be used to specify a port that the STATUS ser-
              vice (statd) should be available on.  The default value is
              unspecified, which means that any available port will be used.

     nfs.statd.send_using_tcp
              This option tells statd to use TCP sockets when contacting other
              hosts.  The default value is 0, which means statd will use UDP.

     nfs.statd.simu_crash_allowed
              This option controls whether statd allows SM_SIMU_CRASH
              requests.  The default value is 0 (not allowed).

     nfs.statd.tcp
              This option specifies whether the STATUS server should support
              connections using TCP.  The default value is 1 (enabled).

     nfs.statd.udp
              This option specifies whether the STATUS server should support
              connections using UDP.  The default value is 1 (enabled).

     nfs.statd.verbose
              This option controls how much logging statd performs.  The
              default value is 0.


FILES

     /etc/nfs.conf  The NFS configuration file.


SEE ALSO

     nfsd(8), rpc.lockd(8), rpc.rquotad(8), rpc.statd(8), mount_nfs(8)

BSD                              July 21, 2009                             BSD

Mac OS X 10.8 - Generated Sat Sep 1 09:33:17 CDT 2012
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