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BE Not Using full capacity of tapes?

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ilpadrino

MIS
Feb 14, 2001
416
US
This may be a question about the tapes, but someone in this forum may have an idea. I use DDS3 and DDS4 tapes. BE doesn't seem to use the full capacity of these tapes. For instance I have an HP autoloader device with 6 DDS slots. If I put four DDS4 tapes in, and one DDS3 I should have up to 184G compressed.

The log indicates that hardware compression is enabled, but I'm getting far less storage out of those tapes. I have less than 130G total to backup, but BE stops at around 126G after the last tape and gives a message that the next media has already been used in the same operation. 126G is nowhere near the theoretical 184G that the tapes should allow.

Any ideas?
thanks.
Joe
 
In windows and NT enviroments don't expect more the 1:1,5 compression in general.

When we look at our tapedrives (STK9940) we always talt about native capacity. Anything more then 1:1 is nice and saves tapes, but in planning we use 1:1 and sometimes up to 1:1,5.

But as you write "theoretical 184G". Try to backup 184GB of data from a SQL database and I think it would work. (most data in an SQL database is SPACE and that is easy to compress)

/johnny
 
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