US Robotics 7931 Betriebsanweisung PDF herunterladen (Seite 99)

Chapter 3 Archiving 75

The equivalent of this directive on a global basis is bufsize=media buffer-size. For

more information on that directive, see “The bufsize Directive: Setting the

Archiver Buffer Size” on page 53.

Specifying the Number of Drives for an Archive Request:

-drivemax, -drivemin, and -drives

By default, the archiver uses only one media drive to archive the files of one archive

set. When an archive set has many files or large files, it can be advantageous to use

more than one drive. In addition, if the drives in your automated library operate at

different speeds, use of multiple drives can balance these variations and thereby

increase archiving efficiency.

The drive directives have the following formats:

An archive request is evaluated against the parameters that are specified, as follows:

■ If an archive request is less than the value of min-size, only one drive is used to

write an archive request.

■ If an archive request is larger than the value of min-size, the archive request is

evaluated against min-size and the appropriate number of drives is scheduled up

to the full number of drives specified.

■ If the value of min-size is 0, an attempt is made to split the archive request among

the full number of drives specified.

-drivemax max-size

-drivemin min-size

-drives number

TABLE 3-14 Arguments for the -drivemax, -drivemin, and -drives Directives

Argument Meaning

max-size The maximum amount of data to be archived using one drive.

min-size The minimum amount of data to be archived using one drive. The

default is the -archmax target-size value (if specified) or the default

value for the media type.

If you specify the -drivemin min-size directive, Sun StorageTek

SAM software uses multiple drives only if there is enough work to

warrant it. As a guideline, set min-size to be large enough to cause

the transfer time to be significantly longer than the cartridge change

time (load, position, unload).

number The number of drives to be used for archiving this archive set. The

default is 1.

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US Robotics 7931 Betriebsanweisung Seite 99