1.\" Copyright (c) 1989, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.Dd December 26, 2009 29.Dt NFSIOD 8 30.Os 31.Sh NAME 32.Nm nfsiod 33.Nd local 34.Tn NFS 35asynchronous I/O server 36.Sh SYNOPSIS 37.Nm 38.Op Fl n Ar num_servers 39.Sh DESCRIPTION 40The 41.Nm 42utility controls the maximum number of 43.Nm 44kernel processes which run on an 45.Tn NFS 46client machine to service asynchronous I/O requests to its server. 47Having 48.Nm 49kernel processes 50improves performance but is not required for correct operation. 51.Pp 52The option is as follows: 53.Bl -tag -width indent 54.It Fl n 55Specify how many processes are permitted to be started. 56.El 57.Pp 58Without an option, 59.Nm 60displays the current settings. 61A client should allow enough number of processes to handle its maximum 62level of concurrency, typically four to six. 63.Pp 64If 65.Nm 66detects that the running kernel does not include 67.Tn NFS 68support, it will attempt to load a kernel module containing 69.Tn NFS 70code, using 71.Xr kldload 2 . 72If this fails, or no 73.Tn NFS 74module was available, 75.Nm 76exits with an error. 77.Sh EXIT STATUS 78.Ex -std 79.Sh SEE ALSO 80.Xr nfsstat 1 , 81.Xr kldload 2 , 82.Xr nfssvc 2 , 83.Xr mountd 8 , 84.Xr nfsd 8 , 85.Xr rpcbind 8 86.Sh HISTORY 87The 88.Nm 89utility first appeared in 90.Bx 4.4 . 91.Pp 92Starting with 93.Fx 5.0 , 94the utility no longer starts daemons, but only serves as a vfs 95loader and 96.Xr sysctl 3 97wrapper. 98