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Tape Libraries and Drives
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Tape Backup

Chénier
Occasional Contributor

Tape Backup

What is the storage capacity of a DDS4 20/40gb?
I would like to know with and without compression.

I'm trying to backup a server that contains approx. 25gb using compression and the 1st tape is always ejected requesting a 2nd one.

Thanks,


Lucie C.
3 REPLIES
Sunil Sharma_1
Honored Contributor

Re: Tape Backup

It's 20 GB without compression and 40 GB with compression.

How did you enabled compression ?
what is your OS and server ?

Sunil
*** Dream as if you'll live forever. Live as if you'll die today ***
Leif Halvarsson_2
Honored Contributor

Re: Tape Backup

Hi,
Please note that compression ratio is very data dependant. The 2-1 ratio you need for 40 GB is only an average and perhaps best apply to plain ascii files. With different data you can get everything from no compression at all (if data is already compressed on disk) to 10-1 or better (log files or empty database files).
Chénier
Occasional Contributor

Re: Tape Backup

OS = Windows 2000
MetaFrame XP
Backup software = NT Backup, so I enable the compression through NT backup software.

Thanks!