Apple Mac OS X Server System Imaging and Software Update Administration For Version 10.4 or Later Bedienungsanleitung PDF herunterladen (Seite 57)

Chapter 5 Managing NetBoot Service 57

The bsdpd_clients file on any given server holds the Ethernet Media Access Control

(MAC) addresses of the computers that have selected this server as their NetBoot

server. As long as a client has an entry in an available server’s bsdpd_clients file, it will

always boot from that server. If that server should become unavailable to those clients,

they will locate and associate themselves with an available server until such time as

you remove their entries (or the entire files) from their servers.

Note: If a client is registered on more than one server because an unavailable server

comes back on line, the client boots from the server with the fewest number of clients

booted off of it.

Distributing Shadow Files

Clients booting from Mac OS X diskless images store temporary “shadow” files on the

server.

By default, NetBoot for Mac OS X clients creates a share point for client shadow files on

the server boot volume. (You can change this behavior; see “Changing How Mac OS X

NetBoot Clients Allocate Shadow Files” on page 35.) You can use Server Admin to see

this share point and to add others. The share points are named NetBootClientsn where

n is the share point number. Share points are numbered starting with zero.

For example, if your server has two disk volumes, the default shadow-file directory is

NetBootClients0 on the boot volume. If you use Server Admin to specify that client data

should also be stored on the second volume, the directory is named NetBootClients1.

NetBoot stores the first client’s shadow files on NetBootClients0, the second client’s

shadow files on NetBootClients1, the third client’s shadow files on NetBootSP0, and so

on. Likewise, with three volumes selected and eight clients, the first, fourth, and

seventh clients will use the first volume; the second, fifth, and eighth clients will use

the second volume; and the third and sixth clients will use the third volume.This load

balancing is automatic and usually ensures optimal performance.

To prevent shadow files from being placed on a particular volume, use the General

pane in the NetBoot service settings in Server Admin. Deselect the client data

checkbox for any volume in which you don’t want shadow files placed.

You can also prevent the shadow files from being placed on a particular volume or

partition by deleting the hidden file /Library/NetBoot/.clients, which is a symbolic link,

from the volume, then stopping and restarting NetBoot service.

Advanced NetBoot Tuning

You can adjust a wide range of NetBoot options by running the bootpd program

directly and by modifying configuration parameters in specific NetInfo directories.

For more information, read the bootpd man page. To view the man page, open

Terminal and type man bootpd.

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Apple Mac OS X Server System Imaging and Software Update Administration For Version 10.4 or Later Bedienungsanleitung Seite 57