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

Example 2: Enforcing Archive Requests

When the environment is balanced between the importance of staging a file back to

the user and the importance of getting new files archived to media, the biggest

concern is exceeding the HWM. In this situation, if not enough files have met their

archive requirements to lower the percentage of the file system that is full, meeting

the pending archive requests is the best way to keep the file system from filling up.

In this situation, the preview.cmd file can be as simple as the following:

Example 3: Prioritizing Requests by Media

Suppose you have a project-oriented environment in which specific users are

working on groups of files that use specific VSNs and are segregated from other

users. In this environment, certain projects might have higher priorities at certain

times; hence, greater priority might be required from the available system storage

resources. You can configure the preview.cmd file with the following directive to

give users and their media the appropriate priority for media drives:

Then, for every VSN in the priority user’s group, enter the following information:

Thereafter, every request that requires the specified VSN is placed above other

pending mount requests in the preview queue.

Later, to deprioritize the user’s media, enter the following reverse command for

every VSN:

Note – A request for a select group of VSNs always takes precedence in the preview

request queue if the chmed(1M) command’s p flag is set.

hwm_priority = 500.0

hwm_priority = 5000.0

# chmed +p lt. VSN

# chmed -p lt. media-type

1 2 ... 165 166 167 168 169 170 171 172 173 174 175 ... 287 288

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US Robotics 7931 Guía de usuario Pagina 170