Autoloader 1/8 Vs 80

[CA1273966]

I have a auotloader 1/8 vs80, however, it is not able to utilize the 80GB capacity of the media.

does anybody have the experience ob this usage?

[CA1063111]

Hallo,
the capacity 80GB is when the data is compressed with the ideal factor 2:1 !
the real capacity is 40GB.
this compression 2:1 is used by all tapes, like DAT, DLT, LTO ,SLR etc. .

[CA1273966]

yes, the 80G capacity comes from compress, however, why the autoloader is not support the compress?

[CA1063111]

Hallo,
the compression is enabled by default of all HP (and other) drives.
The compression is in conjunktion with the data you want to backup.
Office Files (*.dox, *.xls etc) are good to compress but files like *.exe or *.dll etc. you can not compress.
When I backup my data I write ca. 55GB on my 80GB DLT Media, a mix of fullbackup from OS-system and User Data.

[CA1273966]

do you work within same environment as mine?
My device is autoloader storage 1/8 vs80, backup system is Arcserve 9, I never saw the data storage was over 40G whthin on one Tape, my tape is HP DLT 40/80G.
Somebody told me that this device is not support to compress the data because of its characteristic, is it true?

[CA1063111 · Accepted solution]

Hmm, I have an DLT818 Autoloader with arcserve v11
look in the Quickspec: http://h18000.www1.hp.com/products/quickspecs/11403_div/11403_div.HTML
"Maximum native storage capacity of 40 GB, up to 80 GB, assuming 2:1 data compression
Maximum native data transfer rate of 10.8 GB/hour, up to 21.6 GB/hour with compression
Utilizes industry standard DLT Type IV Media "