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

Chapter 3 describes the archive set assignment directive and its arguments

completely.

TABLE 5-5 shows the staging directives that can appear in an archive set

assignment directive.

For more information on these and the other archiver.cmd directives, see

“Archiving” on page 33.

Prioritizing Preview Requests

The archiver and stager processes both can request that media be loaded and

unloaded. If the number of requests exceeds the number of drives available for

media loads, the excess requests are sent to the preview queue.

Archive and stage requests in the preview queue are those that cannot be

immediately satisfied. By default, preview requests are satisfied in first-in-first-out

(FIFO) order.

The number of entries that can be in the preview queue is determined by the

previews= directive in the defaults.conf file. For information on changing the

value of this directive, see the defaults.conf(4) man page.

You can assign different priorities to preview requests. You can override the FIFO

default by entering directives in the preview command file, which is written to

/etc/opt/SUNWsamfs/preview.cmd.

This file schedules a preview request according to whether the request is for file

staging or archiving. You can increase the priority for specific VSNs. Settings in the

preview.cmd file can also reprioritize preview requests for all files or for specific

file systems based on the high-water mark (HWM) or low-water mark (LWM)

settings.

The sam-amld daemon reads the preview directives at startup. You must specify the

directives one per line. If you change this file while the sam-amld daemon is

running, you have to restart the sam-amld daemon to have them take effect.

Comment lines begin with a pound sign (#) and extend through the end of the line.

For more information on this file, see the preview.cmd(4) man page.

TABLE 5-5 Staging Directives That can Appear in the archiver.cmd File

Directive Effect

-stage a Specifies that the files in the archive set should be associatively staged.

-stage d Reset to default.

-stage n Specifies that the files in the archive set should never be staged.

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