How to get full capacity of my DLT tapes

[fspang]

Hi all
I am using SUN L20 with DLT8000 drives, it suppose to hold up to 70gb compressed data, I'm using it for my netbackp oracle RMAN backup. From tha #availabe_media command i can see some of the tapes show full gets about 60gb of data, but most of the tape only gets up to 35gb of data. anyone knows how to get the full capacities

 

[comtec17]

The tape capacities are not guaranteed to get the full compressed rate. This will all depend on how compressable the data is.

 

[PGPhantom]

You also need to ensure that you have enabled hardware compression. I have seen many cases where complaints about the amount of data being stored on tape is far less than expected and the solution was to use hardware compression.

 

[sdeb]

Nothing to add, except that DLT8000 are "supposed" to hold up to 80 gb (supposed).

 

[IThead]

I've used DLT8000 before, I could only backup up to 36GB native if most of the data is already compressed. if the files that you are backing up are not compressed, you can get by > 70GB if you have hardware compression truned on.

 

[fspang]

Many thanks. How could I disable the software compression on the client server. or force to use the hardware compression.