How To:Write to Multiple Volumes in Parallel

From wiki.zmanda.com
Revision as of 13:32, 28 September 2010 by Martineau (talk | contribs) (Created page with 'Amanda can write to multiple volumes in parallel, saving a lot of time. This is useful if you write to more than one volume in a run and the changer have more than one drive. =…')
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to navigation Jump to search

Amanda can write to multiple volumes in parallel, saving a lot of time.

This is useful if you write to more than one volume in a run and the changer have more than one drive.

Advantage

  • Writing to many volume in parallel save times.
  • Can do more than one dump direct to tape in parallel.

Disadvantage

  • Require a more powerful server to be able to stream multiple drives.
  • Performance can be worse if the server can't stream all the drives.

Requirements

  • A Changer with the new changer API must be used.
  • More than one drive must be defined.

Global Configuration

The taper-parallel-write config option must be set to the number of volume amanda can write to in parallel.

In amanda.conf: 

taper-parallel-write 2

Changer Configuration

How to defined multiple drives:

  • chg-disk: No configuration needed. An infinite number of drive can be use.
  • chg-multi: All drives already defined, nothing to do.
  • chg-ndmp: With the tape-device property.
  • chg-robot: With the tape-device property.
  • chg-single: Impossible to do.
Retrieved from ‘http://wiki.zmanda.com/index.php?title=How_To:Write_to_Multiple_Volumes_in_Parallel&oldid=7712’