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Tape Libraries and Drives
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HP Surestore DAT40

Brad Cogswell
Occasional Visitor

HP Surestore DAT40

Having some trouble being that any backup with more than 21.8 Gig wont continue even though it is almost at the end...

How do I know If compression is being achieved? I know that it is a 40 GB tape what I don't know however is if it is Hardware compression that needs to be implemented or Software?

I am backing up with veritas Backup exec 8.0 on NT4.0
"......Straight outta _ _ _ _ _ _ _ ......"
1 REPLY
Gregory Fruth
Esteemed Contributor

Re: HP Surestore DAT40

The 40GB figure is a lie... or at best only an
estimate as to how much will fit on a tape
assuming 2:1 compression. If your data is
not compressible then you will only be able
to fit 20GB on a tape, because the native
capacity of a DDS4 tape is 20GB. If your
data is mostly text files, then the compression
can be 2:1 or better. The drive itself does the
compression.

If your data is compressible and you are still
only getting ~20GB per tape, then there may
be a problem with the jumpers or the driver.