US Robotics 7931 Betriebsanweisung PDF herunterladen (Seite 59)

Chapter 3 Archiving 35

As files are created and modified, the archiver copies them to archive media. The

archiving process also copies the data necessary for Sun StorageTek SAM file system

operations, including directories, symbolic links, the index of segmented files, and

archive media information.

Archive files are compatible with the standard UNIX tar(1) format. This ensures

data compatibility with the Solaris OS and other UNIX systems. If a complete loss of

your Sun StorageTek SAM environment occurs, the tar(1) format allows file

recovery using standard UNIX tools and commands.

Archive set names are determined by the administrator and are virtually unlimited,

with the following exceptions:

■ There are two reserved archive set names: no_archive and allsets.

The no_archive archive set is defined by default. Files selected to be in this

archive set are never archived. Files in a temporary directory, such as /sam1/tmp,

for example, might be included in the no_archive archive set.

The allsets archive set is used to define parameters that apply to all archive

sets.

■ Archive sets named for each Sun StorageTek SAM file system are reserved for

control structure information. Sun StorageTek SAM file systems provide a default

archive set for each file system. For each file system, both the metadata and data

files are archived. The file system archive set encompasses the directory and link

information and any files that are not included in another archive set. The default

archive sets are given the names of their associated file systems and cannot be

changed. For example, samfs1 would be the archive set name for a file system

configured and named as samfs1.

■ Archive set names are limited to 29 characters. The characters are limited to the 26

uppercase and lowercase letters, the digits 0 through 9, and the underscore

character (_).

Archiving Operations

By default, the archiver makes one copy of each archive set, but you can request up

to four. An archive set and a copy number become a synonym for a collection of

volumes. The archive copies provide duplication of files on separate volumes.

The data in a file must be modified before the file is considered to be a candidate for

archiving or rearchiving. A file is not archived if it is only accessed. For example,

issuing a touch(1) or an mv(1) command on a file does not cause it to be archived or

rearchived.

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US Robotics 7931 Betriebsanweisung Seite 59