04-02-2013 09:57 PM
Please help:
in my symentec netbackup media sometime showing full so early.for example: 2114541984 showing full and sometimes 3110560576 showing full.why like this my admin ask me why such a change in your tape media. full so early means i have to buy another media which is very expensive for me. although we know tape media storgae capacity is 1.6 T.
Sorry for my bad english
my netbackup version is 7.1
please help its urgent
Solved! Go to Solution.
04-02-2013 10:18 PM
hi,
the amount data that is writing on the tape is dapends on the compression ratio and this compression ratio always depends on the type of data
generally this compression handles by the tape drive, which is netbackup not aware..
I belive that number that you have provded in KB 2114541984( around 2 TB) and 3110560576(around 3 TB)
though you know that the tape capacity is 1.6 TB, due to the compresssion it able to take more than that..
see below how compression works in different types of data
http://www.symantec.com/business/support/index?page=content&id=HOWTO56173
Note the following levels of compressibility, in descending order:
04-02-2013 10:18 PM
04-02-2013 10:18 PM
hi,
the amount data that is writing on the tape is dapends on the compression ratio and this compression ratio always depends on the type of data
generally this compression handles by the tape drive, which is netbackup not aware..
I belive that number that you have provded in KB 2114541984( around 2 TB) and 3110560576(around 3 TB)
though you know that the tape capacity is 1.6 TB, due to the compresssion it able to take more than that..
see below how compression works in different types of data
http://www.symantec.com/business/support/index?page=content&id=HOWTO56173
Note the following levels of compressibility, in descending order:
04-02-2013 11:13 PM
Netbackup has no understanding of tape capacity, it does not know when a tape becomes full.
The firmware of the drive detects the tape full, and tells the tape driver, which then tells Netbackup.
Therefore, there is nothing that you can do in Netbackup to control of adjust this.
As mentioned, media will hold different amounts of data when full, due to some data compressing more than others. Other issues that can affect amount of data the tape can hold are 'bad' firmware and hardware faults on the drive,.
Martin
04-03-2013 10:12 PM
Thanks guys for your great opinion.
Moinul
04-03-2013 10:20 PM
Please select the post that has helped you most and Mark as Solution.
This will help other users with similar queries.