nfsd(1M)                                                           nfsd(1M)




 NAME    [Toc]    [Back]
      nfsd, biod - NFS daemons

 SYNOPSIS    [Toc]    [Back]
      /usr/sbin/nfsd [ -a ] [ -p protocol ] [ -t device ] [num_nfsd]

      /usr/sbin/biod [num_nfsiod]

 DESCRIPTION    [Toc]    [Back]
      nfsd starts the NFS server daemons that handle client file system
      requests (see nfs(7)).  num_nfsd is the suggested number of file
      system request daemons that will start.  One daemon will be started to
      support the kernel threads servicing TCP requests, and multiple
      additional daemons will be started to service UDP requests.  At system
      boot time, num_nfsd is defined by the NUM_NFSD variable in the
      /etc/rc.config.d/nfsconf file.  When the UDP nfsds are launched, the
      kernel will automatically round up num_nfsd to be a multiple of the
      number of active CPU's in the system.

      A previously invoked nfsd daemon started with or without options must
      be stopped before invoking another nfsd command.

      biod starts num_nfsiod asynchronous block I/O daemons.  These daemons
      are used on the NFS client to improve I/O performance by caching
      asynchronous read-ahead and write-behind requests.  At system boot
      time, num_nfsiod is defined by the NUM_NFSIOD variable in the
      /etc/rc.config.d/nfsconf file.  The number of active CPU's on the
      system does not affect the number of biod daemons started.

    Options    [Toc]    [Back]
      nfsd recognizes the following options:

           -a            Start a NFS daemon over all supported
                         connectionless and connection-oriented transports,
                         including UDP and TCP.

           -p protocol   Start a NFS daemon over the specified protocol.

           -t device     Start a NFS daemon for the transport specified by
                         the given device.

           num_nfsd      num_nfsd is the suggested number of file system
                         request daemons that will start.  The actual number
                         of daemons started will be one daemon to support
                         kernel TCP threads plus a number of UDP daemons.
                         The number of UDP daemons started will be the value
                         of num_nfsd rounded up to a multiple of the number
                         of active CPU's in the system.

      biod recognizes the following options:




 Hewlett-Packard Company            - 1 -      HP-UX 11i Version 2: Sep 2004






 nfsd(1M)                                                           nfsd(1M)




           num_nfsiod    num_nfsiod is the number of asynchronous block I/O
                         daemons that will start.  The number of active
                         CPU's in the system does not affect the number of
                         biod daemons started.

 APPLICATION USAGE    [Toc]    [Back]
      If the nfs_portmon variable is set to 1, then clients are required to
      use privileged ports (ports < IPPORT_RESERVED) in order to get NFS
      services.  The default value of nfs_portmon on HP-UX systems is 0.

      To set the variable, execute the following command on the target
      system:

           kctune nfs_portmon=1

      To unset the variable, execute the following command on the target
      system:

           kctune nfs_portmon=0

 EXAMPLE    [Toc]    [Back]
      On a system with 16 active CPU's the following command:

           /usr/sbin/nfsd 30

      will result in a total 33 nfsds being launched. For UDP requests, the
      kernel rounds-up the requested num_nfsd value to be a multiple of the
      number of active CPU's in the system, resulting in 32 UDP daemons. One
      additional daemon will be launched to support kernel TCP threads,
      resulting in a total of 33 daemons.

      The following command:

           /usr/sbin/biod 16

      will result in a total of 16 block I/O daemons being launched.  The
      number of active CPU's in the system has no effect on the number of
      biods started

 AUTHOR    [Toc]    [Back]
      nfsd was developed by Sun Microsystems, Inc.

 SEE ALSO    [Toc]    [Back]
      mountd(1M), exports(4), kctune(1M).


 Hewlett-Packard Company            - 2 -      HP-UX 11i Version 2: Sep 2004