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.Dd February 17, 2018
.Dt NFS 5
.Os
.Sh NAME
.Nm nfs
.Nd nfs network filesystem
.Sh DESCRIPTION
The
.Nm
implements the mount protocol as per in RFC 1094, Appendix A and
.%T "NFS: Network File System Version 3 Protocol Specification" ,
Appendix I.
.Sh SYSCTL VARIABLES
The following
.Xr sysctl 8
MIBs are defined for use with
.Nm :
.Bl -tag -width "xxxxxx"
.It Va vfs.nfs.access_cache_timeout
.Nm
access cache timeout.
.It Va vfs.nfs.async
Enables unstable and fast writes.
.It Va vfs.nfs.commit_blks
Number of committed blocks.
.It Va vfs.nfs.commit_miss
Number of nfs blocks committed from dirty buffers.
.It vfs.nfs.diskless_rootpath
Prints the host name for mount point.
.It Va vfs.nfs.diskless_swappath
Prints the host name for mount point to swap.
.It Va vfs.nfs.diskless_valid
Prints if diskless params were obtained.
.It Va vfs.nfs.flush_on_hlink
Controls fvp flushing prior to hard link.
.It Va vfs.nfs.flush_on_rename
Controls fvp flushing prior to rename.
.It Va vfs.nfs.gatherdelay
Enables NFS request procrastination.
.It Va vfs.nfs.gatherdelay_v3
Enables NFSv3 request procrastination.
.It Va vfs.nfs.maxasyncbio
Controls maximum number of asynchronous bio's.
.It Va vfs.nfs.neg_cache_timeout
.Nm
negative namecache timeout.
.It Va vfs.nfs.nfs_io_size
Controls the
.Nm
optimal I/O unit size.
.It Va vfs.nfs.nfs_ip_paranoia
Enables no-connection mode for protocols that support no-connection mode.
.It Va vfs.nfs.nfs_privport
Enables privileged source port checks.
.It Va vfs.nfs.nfsv3_commit_on_close
If set, write and commit on close.
If not set, only write on close.
.It Va vfs.nfs.pos_cache_timeout
.Nm
positive namecache timeout.
.It Va vfs.nfs.realign_count
Number of realignments for badly aligned mbuf data.
.It Va vfs.nfs.realign_test
Number of times mbufs have been tested for bad alignment.
.It Va vfs.nfs.showrexmit
Enables retransmits debug prints.
.It Va vfs.nfs.showrtt
Enables round trip time output debug printing.
.It Va vfs.nfs.soreserve
Controls minimum
.Nm
socket buffer size reservation.
.El
.Sh SEE ALSO
.Xr vfs 7 ,
.Xr mountd 8 ,
.Xr mount_nfs 8
.Sh HISTORY
The
.Nm
manual first appeared in
.Dx 5.1 .