Apple Mac OS X Server System Imaging and Software Update Administration For Version 10.4 or Later Uživatelský manuál stáhnout pdf (Strana 55)

Chapter 5 Managing NetBoot Service 55

From the Command Line

You can see the log by viewing the contents of the log file in Terminal. For more

information, see the system image chapter of the command-line administration guide.

Performance and Load Balancing

For good startup performance, it is critical that the NetBoot server be available to the

client computer relying on it. To provide responsive and reliable NetBoot service, you

can set up multiple NetBoot servers in your network infrastructure.

Many sites using NetBoot achieve acceptable responsiveness by staggering the boot

times of client computers in order to reduce network load. Generally, it isn’t necessary

to boot all client computers at exactly the same time; rather, client computers are

booted early in the morning and remain booted throughout the work day. You can

program staggered startup times using the Energy Saver preferences pane.

Boot Images

If heavy usage and simultaneous client startups are overloading a NetBoot server and

causing delays, consider adding additional NetBoot servers to distribute the demands

of the client computers across multiple servers (load balancing). When incorporating

multiple NetBoot servers, it is important to use switches in your network infrastructure,

as the shared nature of hubs creates a single shared network on which additional

servers would have to vie for time.

Distributing Boot Images Across Servers

If you set up more than one NetBoot server on your network, you can place copies of a

particular boot image on multiple servers to distribute the load. By assigning the

copies the same image ID in the range 4096–65535, you can advertise them to your

clients as a single image to avoid confusion.

To distribute an image across servers:

1 Open System Image Utility on the server where the original image is stored.

2 Click Images (near the top of the window) and select the image in the list.

3 If the image’s Index is 4095 or lower, click Edit and give the image an index in the range

4096–65535.

4 Use the Export button to place copies of the image on the other servers.

5 On each of the other servers, use Server Admin to enable the image.

Clients still see the image listed only once in their Startup Disk preferences, but the

server that delivers its copy of the image is automatically selected based on how busy

the individual servers are.

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Apple Mac OS X Server System Imaging and Software Update Administration For Version 10.4 or Later Uživatelský manuál Strana 55