US Robotics 7931 Betriebsanweisung PDF herunterladen (Seite 63)

Chapter 3 Archiving 39

When the file system scan is complete, the sam-arfind process sends each archive

request to the archiver daemon, sam-archiverd, to be scheduled for file copying to

archive media. The sam-arfind process then sleeps for the duration specified by

the interval=time directive. At the end of the interval, the sam-arfind process

resumes scanning.

Step 2: Composing Archive Requests

When archive requests are received by the sam-archiverd daemon, they are

composed. This section describes the composing process.

Because of the capacity of the archive media or of the controls specified in the

archiver command file, the files in an archive request might not be archived all at

one time. Composing is the process of selecting the files from the archive request to

be archived at one time. When the archive copy operation is complete for an archive

request, the archive request is recomposed if files remain to be archived.

The sam-archiverd daemon places the files in the archive request according to

certain default and site-specific criteria. The default operation is to archive all the

files in an archive request to the same archive volumes in the order in which they

were found during the file system scan. The site-specific criteria enable you to

control the order in which files are archived and how they can be distributed on

volumes. These criteria, called archive set parameters, are evaluated in the following

order: -reserve, -join, -sort, -rsort (reverse sort), and -drives. For more

information on these parameters, see the archiver.cmd(4) man page.

If the archive request belongs to an archive set that has -reserve owner specified,

the sam-archiverd daemon orders the files in the archive request according to the

file’s directory path, user name, or group name. The files belonging to the first owner

are selected for archiving. The remaining files are archived later.

If the archive request belongs to an archive set that has -join method specified, the

sam-archiverd daemon groups the files together according to the specified join

method. If -sort or -rsort method is also specified, the sam-archiverd daemon

sorts the files within each group according to the specified sort method. Each group

of joined files is then treated like a single file for the remainder of the composing and

scheduling processes.

If the archive request belongs to an archive set that has -sort or -rsort method

specified, the sam-archiverd daemon sorts the files according to the specified sort

method. Depending on the sort method, the sam-archiverd daemon tends to keep

files together based on the sort method, age, size, or directory location. By default,

archive requests are not sorted, so files are archived in the order in which they are

encountered during the file system scan.

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US Robotics 7931 Betriebsanweisung Seite 63