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backup exec 2012 LTO 4 tape capacity

Created: 12 Jun 2013 | 7 comments

So I installed a TL2000 with a LTO4 tape drive.  My backups seem to take more tapes now than with my LTO3 backups.  I have the Syamntec LTO4 tape drivers in device manager.  Is there a way to get or run a test to see waht is actuially being stored on the tapes?  Thanks

Operating Systems:

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Sush...'s picture

Hello Kirk,

   There is no option to actually see what is stored in the tapes. Ensure that Compression is enabled on the Tape drives and that the Hardware compression option is also selected in the Backup job properties.

Thanks,

-Sush...

Hope this piece of Information Helps you... and if it does then mark this response as Solution....!!!

CraigV's picture

Hi Kirk,

Download your manufacturer's diagnostic utility (if available!) and stop the BE services. Check to see if there is a compression test and run it...this is going to give you an indication on whether or not you're getting compression on the drive.

Also make sure you're using the Symantec drivers for the tape drive...use tapeinst.exe to install them.

Thanks!

Alternative ways to access Backup Exec Technical Support:

https://www-secure.symantec.com/connect/blogs/alte...

Larry Fine's picture

We need to clarify exactly what your issue is here...  LTO4 tapes will certainly hold more than LTO3 tapes, if all other things are equal.

BE2012 has a tendency to use more DIFFERENT tapes than BE 2010, depending upon your job schedules & strategies, but it often doesn't fill them up.  Did you previously use BE2010?

Are you thinking that your LTO4 tapes are not holding as much as they should?

If you find this is a solution for the thread, please mark it as such.

Kirk Hill's picture

i just ran a backup of a file that was 19GB onto the new tapes.  All settigns were set to compress the file but the amoutn of used space on the tapes is 19GB.  That tells me no compression at all.  

Larry Fine's picture

http://www.symantec.com/docs/TECH189307

Backup Exec 2012 incorrectly reports a compression ratio of 1:1 (or 1.0) in the GUI when compression is working correctly.

http://www.symantec.com/docs/TECH50960

Verifying the Hardware Compression Setting in Backup Exec for Windows Servers

https://www-secure.symantec.com/connect/forums/bac...

If you find this is a solution for the thread, please mark it as such.

pkh's picture

To test whether your hardware compression is working, create a new directory and fill it with text files.  Backup this directory and specify hardware compression.  If hardware compression is working, then this job should show a good compression ratio.  Make sure you are using LTO4 tapes with your LTO4 drive for this test.

If the above test shows that your hardware compression is working, then the poor compression ratio from your regular backups is due to the nature of your data.  You could have a lot of compressed files, like zipped and movie files, sound clips, jpegs, etc which when compressed may give you more data than what you have started with.  See my article on this subject

https://www-secure.symantec.com/connect/articles/c...

Sush...'s picture

Hello Kirk,

    You may want to refer to these technotes and verify if the compression is happening or not

http://www.symantec.com/docs/TECH50766 : How Backup Exec for Windows Servers controls hardware compression on tape devices.

http://www.symantec.com/docs/HOWTO73434 : Enabling or disabling hardware compression for tape drives

Also refer to the section "The following can also affect hardware compression:" of the following technote

http://www.symantec.com/docs/TECH6076 : Backups fail to get double the amount of the native capacity recorded to a media, even when hardware compression is being utilized, or the total byte count in the job log is higher than the maximum possible compression rate of the tape media.

    http://www.symantec.com/docs/TECH50960 : Verifying the Hardware Compression Setting in Backup Exec for Windows Servers

Thanks,

-Sush...

Hope this piece of Information Helps you... and if it does then mark this response as Solution....!!!