Apple Mac OS X Server System Imaging and Software Update Administration For Version 10.4 or Later Uživatelský manuál stáhnout pdf (Strana 17)

Chapter 1 About System Imaging Administration 17

You can create and enable additional NetBootSPn and NetBootClientsn share points on

other server volumes using the NetBoot service General settings in Server Admin.

Using NetBoot and Network Install Images on Other Servers

You can also specify the path of a NetBoot image residing on a different NFS server.

When creating your image files, you can specify on which server the image will reside.

See “Using Images Stored on Remote Servers” on page 46.

Client Information File

NetBoot gathers information about a client the first time the client tries to

start up from the NetBoot server. NetBoot stores this information in the file

/var/db/bsdpd_clients.

Shadow Files

Many clients can read from the same boot image, but when a client needs to write

anything back to its startup volume (such as print jobs and other temporary files),

NetBoot automatically redirects the written data to the client’s shadow files, which are

separate from regular system and application software.

The shadow files preserve the unique identity of each client during the entire time it is

running from a NetBoot image. NetBoot transparently maintains changed user data in

the shadow files, while reading unchanged data from the shared system image.

The shadow files are re-created at boot time, so any changes made by the user to his or

her startup volume are lost at restart.

For example, if a user saves a document to the startup volume, after a restart that

document will be gone. This behavior preserves the condition of the environment the

administrator set up. Therefore it is recommended that users have accounts on a file

server on the network to save their documents.

Balancing the Shadow File Load

NetBoot creates an AFP share point on each server volume you specify (see “Choosing

Where Shadow Files Are Stored” on page 46) and distributes client shadow files across

them as a way of balancing the load for NetBoot clients. There is no performance gain

if the volumes are partitions on the same disk. See “Distributing Shadow Files” on

page 57.

Warning: Don’t rename a NetBoot share point or the volume on which it resides.

Don’t use Workgroup Manager to stop sharing for a NetBoot share point unless you

first deselect the share point for images and shadow files in Server Admin.

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Apple Mac OS X Server System Imaging and Software Update Administration For Version 10.4 or Later Uživatelský manuál Strana 17