US Robotics 7931 Betriebsanweisung PDF herunterladen (Seite 62)

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

Continuous Archiving

Continuous archiving is the default archiving method (the archiver.cmd file

parameter is examine=noscan). With continuous archiving, you can specify

scheduling start conditions for an archive set by using the -startage,

-startcount, and -startsize parameters. These conditions enable you to

optimize archive timeliness versus archive work done. For example:

■ If it takes an hour to create files that should be archived together, you can set the

-startage parameter to one hour (-startage 1h) to ensure that all files are

created before scheduling the archive request.

■ You can specify a -startsize of 150 gigabytes (-startsize 150g) to direct

the archiver to wait until 150 gigabytes of data are ready to be archived.

■ If you know that 3000 files will be generated for archival, you can specify

-startcount 3000 to ensure that the files are archived together.

When any of the scheduling start conditions is reached, the sam-arfind process

sends each archive request to the archiver daemon, sam-archiverd,tobe

scheduled for file copying to archive media.

For more information about archiving parameters see “Global Archiving Directives”

on page 52.

Note – When examine is set to noscan, the following default settings are

automatically implemented:

- startage: 10 minutes

- startsize: 10 gigabytes

- startcount: 10,000 files

Scanned Archiving

As an alternative to continuous archiving, you can specify examine=scan in the

archiver.cmd file to direct sam-arfind to examine files for archival using

scanning. Files needing archiving are placed into archive requests. The sam-arfind

process scans each file system periodically to determine which files need archiving.

The first scan is a directory scan, in which sam-arfind descends recursively

through the directory tree. The process examines each file and sets the file status flag

to archdone is set if the file does not need archiving. During successive scans, sam-

arfind scans the .inodes file. Only inodes with the archdone flag not set are

examined.

For information about controlling the setting of the archdone flag, see “The

setarchdone Directive: Controlling the Setting of the archdone Flag” on page 60.

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US Robotics 7931 Betriebsanweisung Seite 62