Brian Cuttler schreef:

An interesting but confusing (for me) read, but the wiki page
was very helpful.

http://wiki.zmanda.com/index.php/Splitting_dumps_across_tapes

We are will likely be implementing this shortly, I have a number
of jukeboxes with large DLE or many small DLE where I'm only
partially filling multiple tapes, I have a related question.

Is there a value in trying to match the tape_slitsize to the chunksize ?

They are completely unrelated, and can be used orthogonal.

"chunksize" is a holdingdisk parameter mainly to overcome filesize
limitations on certain filesystems.  One additional benefit is that
when using many holdingdisk areas, one dump one holdingdisk can be
spread over all these disks, even if each of them would be too small
to hold one complete image.

"tapesplit_size" is the size of chunk on tape.  When writing such
a chunk to tape, and the tape bumps into EOT, the next tape is loaded,
and the complete chunk is rewritten again.  Compare this to the
alternative to restart the complete dumpimage on that tape:  it
avoids wasting too much tape (and time writing it).

Note also that tapesplit_size is a dumptype parameter:  you may
specify which DLE's should be split, and which not (e.g. not
splitting the DLE's that contain the amanda software makes
restores easier, when that disk itself was lost).


--
Paul Bijnens, Xplanation                            Tel  +32 16 397.511
Technologielaan 21 bus 2, B-3001 Leuven, BELGIUM    Fax  +32 16 397.512
http://www.xplanation.com/          email:  Paul.Bijnens AT xplanation DOT com
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