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Chapter 3 Archiving 41

Drives

If the archive set has the -drives parameter specified, the sam-archiverd

daemon divides the selected files in the archive request among multiple drives. If the

number of drives available at this time is fewer than that specified by the -drives

parameter, the smaller number is used.

If the total size of files in the archive request is less than the -drivemin value, only

one drive is used. The -drivemin value is either the value specified by the

-drivemin parameter or the archmax value. The archmax value is specified by the

-archmax parameter or the value defined for the media. For more information on

the -archmax parameter and the archmax= directive, see the archiver.cmd(4)

man page.

If the total size of files in the archive request is more than the -drivemin value,

then the number of drives used is determined by the total size of the files divided by

the -drivemin value. If the number of drives used is fewer than the number of

drives specified by the -drives parameter, that is the number that is used.

Drives can take varying amounts of time to archive files. You can use the

-drivemax parameter to obtain better drive utilization. The -drivemax parameter

requires you to specify the maximum number of bytes to be written to a drive before

that drive is rescheduled for more data.

Volumes

For archiving to occur, there must be at least one volume with enough space to hold

at least some of the files in the archive request. If it has enough space, the volume

that has most recently been used for the archive set is the one scheduled. This

volume must not be in use by the archiver.

If a volume usable for the archive set is busy, another is selected, unless the

-fillvsns parameter is specified. In this case, the archive request cannot be

scheduled.

If an archive request is too big for one volume, the files that can fit on the volume are

selected to be archived to the volume. If the archive request contains files that are

too big to fit on one volume, and volume overflow for the archive request is not

selected, the files cannot be archived. An appropriate message for this condition is

sent to the log.

You can specify volume overflow for the archive set by using the -ovflmin

parameter or for the media by using the ovflmin= directive. For more information

about the -ovflmin parameter and the ovflmin= directive, see the

archiver.cmd(4) man page. The ovflmin specification determines the file size

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