US Robotics 7931 Podręcznik Użytkownika Pobierz pdf (Strona 166)

142 Sun StorageTek SAM Archive Configuration and Administration Guide • Version 4, Update 6, 04/07

If this factor is more than 1.0, it increases the importance of the time factor in

calculation of the total priority. If it is less than 1.0, it decreases the importance of the

time factor. Setting the factor to 0.0 eliminates the time factor from the overall

priority calculation.

A VSN whose priority flag is not set increases in priority based on the time it

remains in the queue. Its priority can become higher than a VSN that comes into the

queue later with the priority flag already set.

Global or File-System-Specific Water Mark

Directives

The water mark preview request directives can be used as either global or file-

system-specific directives. The water mark priority directives determine the water

mark priority of the preview requests, as shown in the following equation.

When the water mark priority factor is a positive number, the result on the overall

calculated priorities increases archiving requests over staging requests. In contrast,

when the water mark priority factor is a negative number, the overall priority for

archiving requests is reduced, which tends to favor staging requests over archival

requests. A water mark priority factor of 0.0 (or no specified command at all)

indicates that no special action occurs. For more information, see the example in

“Example 1: Enforcing Stage Requests” on page 145.

TABLE 5-6 shows the four water mark priority directives and their arguments.

lwm_priority +

lhwm_priority +

hlwm_priority +

hwm_priority

__________________

= water mark priority

TABLE 5-6 Water Mark Priority Directives

Priority Directive Argument

lwm_priority = value For value, specify the amount by which you want the water

mark priority factor to change for archiving requests when the

file system is below the LWM level. The default is 0.0.

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US Robotics 7931 Podręcznik Użytkownika Strona 166