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тАО07-17-2005 11:28 PM
тАО07-17-2005 11:28 PM
Please help:
I am trying to back up ca 50 GB of data (Lotus Notes databases) on to 40/80 GB DLT tape drive (Storage Works not VS 80)
However I am ubale to do so as the tapes fill up and compression doesn't appear to be working although the option is set on the tape drive and the option to use software compresion is selected as well.
(Back up software is ArcServe 2000)
Thanks
Solved! Go to Solution.
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тАО07-17-2005 11:53 PM
тАО07-17-2005 11:53 PM
Re: Back Up Compression
See if Windows native backup utility gives you an option to compress and thus test the backup. If it works, then ArcServe2000 has functionality problem.
Regards
Mahesh
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тАО07-18-2005 12:47 AM
тАО07-18-2005 12:47 AM
Re: Back Up Compression
Wim
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тАО07-18-2005 06:57 AM
тАО07-18-2005 06:57 AM
Re: Back Up Compression
It is entirely possible that it is attempting to compress the data, but if the database is very full, you may not be getting much compression. What you require may not be possible without spanning 2 tapes.
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тАО07-19-2005 02:53 AM
тАО07-19-2005 02:53 AM
Re: Back Up Compression
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тАО07-19-2005 03:54 AM
тАО07-19-2005 03:54 AM
Re: Back Up Compression
compression can guarantee 2:1 ratio; may be smaller and sometime may be equal to 1 that means tape doesn't compress any data.
If your database use some compression technique you MUST use 80Gb tape.
Antonio Vigliotti
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тАО07-19-2005 07:53 AM
тАО07-19-2005 07:53 AM
Solutiondensity setting: http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=lpg50551
Be sure to disable SW compression and use only HW : http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=lpg50030
Check also for performance problem that can slower the capacity of a tape : http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=lpg50167
The default capacity (native capacity) is 40 GB, in optimum conditions, and the source data allow compression in a ratio of 2:1, you can get 80 GB. Nowadays, the data comming from the servers are ususaly already optimized, and the compression allowed is very poor. This is the first factor that could reduce the capacity on a tape.
Also other factor can influence the capacity, if the tape is damaged, several blocs will be not available to be written, then total capacity will be reduced.
Another factor is if the drive itself have problem on some channel of the read/write head, this will reduce the capacity because some of these channels will not write data.
One more factor is if the drive cannot write data in a "streaming mode", this means that the data are not arriving from the server at a troughputh high enough to feed the tape, and then, some parts of the tape will stay blank, reducing his capacity.
You can use LTT to identify the cause of this reduced capacity on your drive
marino