US Robotics 7931 Uživatelská příručka stáhnout pdf (Strana 61)

Chapter 3 Archiving 37

The sam-arfind process determines the archive set to which the file belongs by

using the file properties descriptions. The characteristics used for determining a

file’s archive set include the following:

■ The directory path portion of the file’s name and, optionally, the complete file

name using a regular expression

■ The user name of the file’s owner

■ The group name of the file’s owner

■ A minimum file size

■ A maximum file size

If the archive age of the file for one or more copies has been met or exceeded,

sam-arfind adds the file to one or more archive requests for the archive set. An

archive request is a collection of files that belong to the same archive set. The archive

request resides in the following directory:

/var/opt/SUNWsamfs/archiver/file_sys/ArchReq

The files in this directory are binary files, and you can display them by using the

showqueue(1M) command.

Separate archive requests are used for files not yet archived and for files being

rearchived. This allows scheduling to be controlled independently for these two

types of files.

If the archive age of the file for one or more copies has not been met, the directory in

which the file resides and the time at which the archive age is reached is added to a

scan list. Directories are scanned as the scan list times are reached. Files that have

reached their archive age are added to archive requests.

If a file is offline, the sam-arfind process selects the volumes to be used as the

source for the archive copy. If the file copy is being rearchived, the sam-arfind

process selects the volume containing the archive copy that is being rearchived.

If a file is segmented, only those segments that have changed are selected for

archival. The index of a segmented file contains no user data, so it is treated as a

member of the file system archive set and is archived separately.

There are two methods by which files are marked for archiving: continuous archiving

and scanning. With continuous archiving, the archiver works with the file system to

determine which files need to be archived. With scanning, the archiver periodically

peruses the file systems and selects files for archiving. The following sections

describe these methods.

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US Robotics 7931 Uživatelská příručka Strana 61