Yamaha CDR400c Series Manual de usuario descargar pdf (Pagina 102)

Using iXOS-JUKEMAN

iXOS-JUKEMAN 2.2 User Manual Pre.12/97102

4.8 Attach devices automatically

Using the command cdadm (see section “Command line index” on page

213), devices can be attached or detached dynamically while the server is

running. In addition, you may specify a list of devices to be attached

automatically when the server starts up.

The server will not respond to file system requests while devices are be-

ing attached automatically. If, in contrary, the devices are being attached

with cdadm after the server start-up, there is a small time gap in which the

server will accept file system requests, but will respond with error mes-

sages, since the disks cannot be found. This can be avoided if you list the

devices in the file server.cfg.

This is especially useful with NFS. If the server fails the clients will not be

affected. They do not receive error messages, they just wait for the server

to reply. This demonstrates the power of the stateless NFS concept.

Format of the devices section in the file server.cfg

The section devices contains a subsection called list. This is where

devices are listed (to be more specific, the section lists the names of the

device description files. The extension .dev may be omitted). The next

subsections specify whether or not each device is to be attached auto-

matically at server start-up. A device for which manual attach is defined

has no effect in server.cfg (apart from making it known to the GUI in

NT, so you can attach it manually through the GUI). This allows you to

disable automatic attach of a device without deleting it in server.cfg. A

device for which automatic attach is defined is attached by the server

upon start-up before the server accepts any file system requests. This

avoids a time gap in which the file system is present but incomplete.

Example for a device list

Suppose you have two jukeboxes, whose device description files are

named mercury.dev and pioneer.dev, and you want the Mercury to

be attached automatically upon server start-up. The devices section in

server.cfg should then look like this:

1 2 ... 97 98 99 100 101 102 103 104 105 106 107 ... 272 273

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Yamaha CDR400c Series Manual de usuario Pagina 102