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

Calculating Total Preview Request

Priority

The numeric priority of preview requests is determined by the combination of static

and dynamic factors. Higher numbers correspond to higher priority. A static priority

factor is set when the request is generated. Its effect does not change the overall

priority after the request is generated and is waiting to be satisfied. A dynamic

priority factor can increase or decrease the overall priority of a request while the

request is waiting to be satisfied.

The total priority for a preview request is the sum of all priority factors. It is

calculated as follows:

total priority = vsn_priority + wm_priority + (age_priority *

time_in_sec_as_preview_request)

Setting Up a Preview Request Priority

Scheme

Change the default preview request FIFO scheme only if there are compelling

reasons to do so, such as the following:

■ Ensure that staging requests are processed before archive requests.

■ Ensure that archive requests gain top priority when a file system is about to fill

up.

■ Push requests that use a specific group of media to the top of the preview request

list.

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