The capacity of a DDS-3 tape is 12GB uncompressed, 24GB with hardware
compression.  

By your specifications you should not even be able to backup what you have
on one tape but IMAGE databases with large capacities and little data
compress very nicely, while others things such as programs do not compress
as much.

I don't think you have a tape problem, more like an abundance of data
problem.

Denys

-----Original Message-----
From: HP-3000 Systems Discussion [mailto:[log in to unmask]] On Behalf
Of Newton, Ernie
Sent: Tuesday, December 10, 2013 3:01 PM
To: [log in to unmask]
Subject: [HP3000-L] Backup question

Greetings,

We do a full backup nightly.  We backup to a DDS-3 tape drive, with DDS-3
tapes.

Occasionally the backup requests a second tape and I'm not sure if we're
really reaching the limit of a DDS-3, or some of my tapes are bad.

A DISCFREE command shows 252MB sectors used that I believe converts to
approximately 64GB of data.

The STORE command uses the COMPRESS parameter.

Am I reaching the capacity of my DDS-3 tapes?

Thanks,

Ernie Newton
Information & Technology Services
Yolo County Office of Education


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