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.\" From: @(#)nfsiod.8 8.2 (Berkeley) 2/22/94 29.\" 30.Dd December 26, 2009 31.Dt NFSIOD 8 32.Os 33.Sh NAME 34.Nm nfsiod 35.Nd local 36.Tn NFS 37asynchronous I/O server 38.Sh SYNOPSIS 39.Nm 40.Op Fl n Ar num_servers 41.Sh DESCRIPTION 42The 43.Nm 44utility controls the maximum number of 45.Nm 46kernel processes which run on an 47.Tn NFS 48client machine to service asynchronous I/O requests to its server. 49Having 50.Nm 51kernel processes 52improves performance but is not required for correct operation. 53.Pp 54The option is as follows: 55.Bl -tag -width indent 56.It Fl n 57Specify how many processes are permitted to be started. 58.El 59.Pp 60Without an option, 61.Nm 62displays the current settings. 63A client should allow enough number of processes to handle its maximum 64level of concurrency, typically four to six. 65.Pp 66If 67.Nm 68detects that the running kernel does not include 69.Tn NFS 70support, it will attempt to load a kernel module containing 71.Tn NFS 72code, using 73.Xr kldload 2 . 74If this fails, or no 75.Tn NFS 76module was available, 77.Nm 78exits with an error. 79.Sh EXIT STATUS 80.Ex -std 81.Sh SEE ALSO 82.Xr nfsstat 1 , 83.Xr kldload 2 , 84.Xr nfssvc 2 , 85.Xr mountd 8 , 86.Xr nfsd 8 , 87.Xr rpcbind 8 88.Sh HISTORY 89The 90.Nm 91utility first appeared in 92.Bx 4.4 . 93.Pp 94Starting with 95.Fx 5.0 , 96the utility no longer starts daemons, but only serves as a vfs 97loader and 98.Xr sysctl 3 99wrapper. 100