US Robotics 7931 Betriebsanweisung PDF herunterladen (Seite 165)

Chapter 5 Staging 141

The following types of directives can appear in the preview.cmd file:

■ Global directives, which apply to all file systems. These must appear before the

first fs = line.

■ Directives that are specific to individual file systems. These directives must

appear in the file after all global directives.

File system directives begin with fs = file-system-name. This directive names the

file system to which all subsequent directives pertain. More than one block of file

directives can appear in a file. File system directives apply until the next fs =

line is encountered or until the end of file is encountered.

Note – When multiple directives affect a file system, the directives that are specific

to that file system override the global directives.

Global VSN and Age Directives

The VSN and age priority directives are global directives, so they come before any

file-system-specific directives in the preview.cmd file.

The VSN priority directive has the following format:

This directive is a static priority factor that indicates the value by which the total

priority increases for a VSN flagged as a high-priority VSN. The default value for

vsn_priority is 1000.0. A VSN must have its priority flag set when it is

scheduled as a preview request to gain this value. Use the chmed(1M) command to

set the priority flag with the p option (for example, chmed +p lt.AAA123). This

flag takes effect for all submitted requests for the VSN that are not already preview

requests.

The age priority directive has the following format:

This directive is also a static priority factor, although its overall effect is dynamic.

The age_priority factor is multiplied by the number of seconds for which a

request is a preview request. The result is then added to the overall priority of the

request. The longer a request waits to be satisfied, the larger the age factor becomes.

Setting this factor helps to ensure that older requests are not indefinitely superseded

by newer requests with other higher-priority factors.

vsn_priority = value

age_priority = factor

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US Robotics 7931 Betriebsanweisung Seite 165