Joe,

The native data capacity for an LTO-5 tape is 1.5 TB.  The 3 TB you were quoted 
assumes a 2 to 1 compression ratio which is typically used for marketing 
purposes.  What compression ratio you actually get depends on the data you are 
backing up.

We have LTO-4 tapes which have a native capacity of 800 GB and we typically get 
900-1200 GB on them so it sounds to me like you're doing ok on your compression 
if your data mix is similar to ours.

Dave Werth
Garmin AT, Inc.
Salem, Oregon

-----Original Message-----
From: EMC NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU] On 
Behalf Of gunnerjoe
Sent: Thursday, April 18, 2013 4:03 PM
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Subject: [Networker] Compression Question

Hello,

I checked all the logs there are no errors at all except an occasional "ASR" 
could not back, but nothing that would explain why most tapes reach "Full" at 
2.5 - 2.7 TB and one tape reported full at 1800 GB.

Even 2.5 TB per tape is annoying as that is 500 GB short of what LTO 5 tape is 
suppose to hold (3TB).

Ideas?

Joe

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