ND(8C)

NAME
nd - network disk control

SYNOPSIS
/etc/nd [ command ]

DESCRIPTION
The nd command controls the network disk service of the kernel as described in nd(4P). A single command may be given on the command line; if none is given then the standard input is read for a list of commands. Typically, the file /etc/nd.local is used for input. Lines beginning with `#' are considered to be comments.

The available commands are:

user hostname hisunit mydev myoff mysize mylunit maxpkts
For the client hostname transform incoming requests for hisunit into server device mydev at offset myoff and size mysize sectors. When responding to a read reequest, allow at most maxpkts packets to be outstanding at one time without a reply. /dev/ndlmylunit provides a local name for this disk ``subpartition''. If mysize is -1, then this user unit is equivalent to the entire filesystem partition mydev (no subpartioning is done.) If mylunit is -1 then no local name is needed for this user unit; this is usually the case with a swap unit, or a unit represented by an entire filesystem. If hostname is a numeric zero, hisunit refers to a public unit. Since nd assists diskless clients in booting, the files (or their equivalent YP maps) /etc/hosts and /etc/ethers are used to map the users' hostnames to their IP addresses and ethernet addresses, respectively. If maxpkts is not specified, the default value is 6.

version versionnumber
The version command gives the level of configuration of the server. Occasionally the need arises to reorganize or reload the diskless partitions. Since the clients will rewrite locally cached blocks, they must be kept from writing their filesystems until they reboot. Before such a reorganization occurs, the system manager should warn diskless users to save files and halt their machines. Modification of the partitions should occur with the disk server off. After modification is complete, versionnumber should be incremented to force users to reboot.

son
Starts the network disk server. This command should be issued after all user, version, and ether commands.

soff
Stops the disk server until a subsequent son command.

clear
Stops the disk server and clears all user and ether information.

serverat hostname
Systems with disks may use the serverat command to specify a disk server if they wish to use a network disk in addition to their locally attached disk. Even then, this command is only necessary if they wish to use a public network disk, or if they wish to change network disk servers.

FILES
/etc/nd.local
/etc/hosts
/etc/ethers

SEE ALSO
nd(4P)

BUGS
No sanity checking of disk partitions is done.