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тАО04-28-2003 10:51 PM
тАО04-28-2003 10:51 PM
compression Hw file wav with dat40e
Hello,
Somebody could me explain why a cust can't put, on DDS-4, no more than 20 gb with hw compression.
But with hw compression off and He compress this files with winzip he has 6 gb. It mines that wave files can be compressed. He run LTT and compression test is ok. He use os: XP and He tried different backup sw and is the same risult.
Thank you very much for the answer.
Regards Marcello
Somebody could me explain why a cust can't put, on DDS-4, no more than 20 gb with hw compression.
But with hw compression off and He compress this files with winzip he has 6 gb. It mines that wave files can be compressed. He run LTT and compression test is ok. He use os: XP and He tried different backup sw and is the same risult.
Thank you very much for the answer.
Regards Marcello
3 REPLIES 3
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тАО04-29-2003 12:54 AM
тАО04-29-2003 12:54 AM
Re: compression Hw file wav with dat40e
Let him try
ntbackup /hc:on
and see how much this simple ntbackup utility with hardware compression forced on will backup
Eugeny
ntbackup /hc:on
and see how much this simple ntbackup utility with hardware compression forced on will backup
Eugeny
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тАО04-29-2003 06:52 AM
тАО04-29-2003 06:52 AM
Re: compression Hw file wav with dat40e
Cust already tried with ntbackup and hc on ,he has same pb, he has 26 gb of wave file and ask the second tape, but if make compression with winzip his arround 10 gb.
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тАО05-01-2003 06:29 AM
тАО05-01-2003 06:29 AM
Re: compression Hw file wav with dat40e
Explanation: the hardware compression in tape drives is only a little more sophisticated than multiple character suppression - but it works in real time, so don't knock it. Winzip can apply very much more clever algorithms - but it can take seconds, minutes or longer to compress files using maximum compression.
If he's doing a lot of these backups, he should create a script that compresses all the .WAV files he's concerned about, and run this as a pre-job script, then backup to tape with the hardware compression turned OFF!.
If he's doing a lot of these backups, he should create a script that compresses all the .WAV files he's concerned about, and run this as a pre-job script, then backup to tape with the hardware compression turned OFF!.
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