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11-15-2006 11:04 PM
11-15-2006 11:04 PM
DAT40 don´t make compressing.
i have several DAT40 with compressing enable, but the compressing don´t work.
I use NTBackup on Windows2003 and WinNt, the driver used for the DAT are native from the Windows.
Any one can help me with this problem.
I can send the LTT logs just send me the email.
Thanks.
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11-16-2006 02:14 AM
11-16-2006 02:14 AM
Re: DAT40 don´t make compressing.
How much data are you attempting to back up? What type of data is it? What tapes are you using?
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11-16-2006 06:45 AM
11-16-2006 06:45 AM
Re: DAT40 don´t make compressing.
I´m just the hardware technician and i´m not the final user.
Thanks
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11-19-2006 10:14 PM
11-19-2006 10:14 PM
Re: DAT40 don´t make compressing.
38 GB
What type of data is it?
Data, Video and Data.
What tapes are you using?
The tapes are the 20GB from Imation and Sony.
Thanks for your help.
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11-20-2006 08:29 PM
11-20-2006 08:29 PM
Re: DAT40 don´t make compressing.
http://h20000.www2.hp.com/bc/docs/support/SupportManual/c00713152/c00713152.pdf
If this runs OK - the drive is OK
Could be the data is already compressed (MPEG's/JPG's etc are a compressed format).
If your not sure - try "zipping" it up with something like 'Winzip' - this will show you what compression ratio is possible for your data.
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11-20-2006 11:48 PM
11-20-2006 11:48 PM
Re: DAT40 don´t make compressing.
Also using windows backup. Backing up about 26GB of data (files, pictures, video) when it reaches about 20gb asks for a second tape. The data i am backing up is not compressed on the drive i select it from.
My question is why can i not go above 20gb regardless of data, even if it does not give me the exact 40gb compressed it should allow me more than 20gb
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11-21-2006 12:56 AM
11-21-2006 12:56 AM
Re: DAT40 don´t make compressing.
As I said earlier, L&TT will tell you if the drive compression algorithm is functioning. If you still aren't sure, L&TT will allow you to create data of a known compression ratio. You can then back this data up, and if it doesn't compress - you have a faulty drive !. Bad media/excessive re-writes of data can also reduce the total capacity of the media - again, L&TT will allow you to run a media validation check to see if there's a problem with your tapes.
If the data cannot be compressed, the drives internal compression cannot work!. A rough and ready check is to try another compression utility such as Winzip, to see if your data can be compressed, (but beware, hardware compression on the drive is not as efficient as software compression used by Winzip and other utilities).
Finally - are you sure Ntbackup is configured to compress? - from the GUI there is a box to tick, and command line there should be a \hc:on switch.
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11-21-2006 09:50 PM
11-21-2006 09:50 PM
Re: DAT40 don´t make compressing.
I´m gone try to compress the data with software to see how much compressing is used.
Thanks to all.
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11-23-2006 12:24 AM
11-23-2006 12:24 AM
Re: DAT40 don´t make compressing.
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&taskId=110&prodSeriesId=42863&prodTypeId=12169&prodSeriesId=42863&objectID=c00059124
Maybe this could be the problem