Why does hardware compression confuse Amanda?

Michael Martinez
System Administrator (Contractor)
Information Systems and Technology Management
CSREES - United States Department of Agriculture
(202) 720-6223


-----Original Message-----
From: Scott Sanders [mailto:ssanders AT conceptsdirectinc DOT com]
Sent: Wednesday, August 07, 2002 6:03 PM
To: amanda-users AT amanda DOT org
Subject: Re: To use or not to use DAT drive compression


There are a couple of reasons not to use hardware compression.

1. It confuses Amanda.
2. Software compression will give you much higher compression results.

Hope that answers it!

"Paul G. Allen" wrote:

> My changer has an HP35480A DAT drive. Should I enable drive compression
> for use with Amanda and NOT use software compression for backups, or
> should I disable the drive compression and use software compression for
> backups? The compression on these drives is enabled/disabled with DIP
> switches. It can be controlled through software, IF the SCSI driver
> supports it and it looks like scsi-changer does not (I have no
> indication that I am able to turn the drive compression on/off, even
> though the DIP switches are currently set to allow it).
>
> PGA
> --
> Paul G. Allen
> Owner, Sr. Engineer, Security Specialist
> Random Logic/Dream Park
> www.randomlogic.com

--
Scott Sanders

Systems Administrator
Concepts Direct, Inc.
2950 Colorful Ave.
Longmont, CO 80504