US Robotics 7931 Guide de l'utilisateur télécharger pdf (Page 79)

Chapter 3 Archiving 55

Also see the -drivemax, -drivemin, and -drives archive set copy parameters

described in “Specifying the Number of Drives for an Archive Request: -drivemax,

-drivemin, and -drives” on page 75.

The examine Directive: Controlling Archive Scans

New files and files that have changed are candidates for archiving. The archiver

finds such files through one of the following:

■ Continuous archiving, in which the archiver works with the file system to detect

file changes immediately after they occur

■ Scan-based archiving, in which the archiver scans the file system periodically

looking for files that need to be archived

This directive has the following format:

For method, specify one of the keywords shown in

TABLE 3-6.

The interval Directive: Specifying an Archive Interval

The archiver runs periodically to examine the status of all mounted Sun StorageTek

SAM file systems. The timing is controlled by the archive interval, which is the time

between scan operations on each file system. To change the time, use the interval

directive.

examine=method

TABLE 3-6 Values for the examine Directive’s method Argument

method Value Meaning

noscan Specifies continuous archiving. After the initial scan, directories are

scanned only when the content changes and archiving is required.

Directory and inode information is not scanned. This archiving

method provides better performance than scan-based archiving,

particularly for file systems with more than 1,000,000 files. Default.

scan Specifies scan-based archiving. The initial file system scan is a

directory scan. Subsequent scans are inode scans.

scandirs Specifies scan-based archiving on directories only. If the archiver

finds a directory with the no_archive attribute set, that directory is

not scanned. Files that do not change can be placed in such a

directory, and this can dramatically reduce the amount of time spent

on archiving scans.

scaninodes Specifies scan-based archiving on inodes only.

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US Robotics 7931 Guide de l'utilisateur Page 79