Re: HP M8505 LTO3 FC Tape is compressed mode (959 Views)
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Occasional Advisor
barkath
Posts: 16
Registered: ‎01-11-2007
Message 1 of 4 (965 Views)
Accepted Solution

HP M8505 LTO3 FC Tape is compressed mode

Hi all,

 

We have HP M8505 LTO3 FC tape drive connected H-Series system. We configured in SCF in compression mode and tape catridges used is 800GB LTO3 Tapes. Now the problem is , when we take backup of 1TB its using 3 800 GB LTO3 Tapes that means its not taking the backup in compressed mode.

 

so how to take backup in compressed mode.

 

Thanks in Advance.

Honored Contributor
Matti_Kurkela
Posts: 6,271
Registered: ‎12-02-2001
Message 2 of 4 (959 Views)

Re: HP M8505 LTO3 FC Tape is compressed mode

The "native" (uncompressed) capacity of a LTO3 is 400 GB, not 800 GB.

 

http://en.wikipedia.org/wiki/Linear_Tape-Open

 

If the data in your 1TB backup is already compressed or not compressible by nature (e.g. encrypted), the expected 2:1 compression ratio may not be realized.

MK
Occasional Advisor
barkath
Posts: 16
Registered: ‎01-11-2007
Message 3 of 4 (931 Views)

Re: HP M8505 LTO3 FC Tape is compressed mode

MK,

 

You are correct LTO3 native capacity is 400 GB.

 

But How to ensure that backup is taken im compressed mode?
How to check whether the HP M8505 tape drive is supporting compression mode?

 

Thanks,
Venkatesan.

Acclaimed Contributor
Dennis Handly
Posts: 25,290
Registered: ‎03-06-2006
Message 4 of 4 (928 Views)

Re: HP M8505 LTO3 FC Tape is compressed mode

>How to ensure that backup is taken in compressed mode?

 

Even if in compressed mode, some types of data can't be compressed, so you'll get only 400 GB.

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