nobody that can help me?

NDMP for NAS devices is always the BEST PRACTICE for backup. What you are doing is legacy backup and backup performance in this case is also not up-to-the-mark.

I has faced the similar issue in many NAS setup and enabling NDMP has helped me so far.

I'd also recommend you enabling the NDMP based backup for your NS-480 filer.

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Hi,
I've got already NDMP license. As I wrote, I can't use NDMP because I can't restore my datas in case of disaster.

I just know that best practise are to use ndmp, but I'm expecting to have the same performance of before (when datas were on windows server) at least. Isn't It?

i got it now.. can you be more elabrate on migration.. how  r u perfroming migration...

I've performed migration with emcopy tool

Probably I've found the problem. I've tried to adjust NET_BUFFER_SZ parameter following the netbackup tuning guide.

According to this seer.entsupport.symantec.com/docs/245920.htm I can change better my parameters.. But I don't know how...

Changing NET_BUFFER_SZ to 256 now my backup speeds at twice... But How can I adjust for let it to running faster?

In the Windows environment, buffer size is a tricky creature.  For tape devices, the default is 64k.  Disk is 256k.  By changing these values, you maybe able to backup the data - but unable to restore.  The biggest bang for your buck is the "number of buffers".  For that, you just need memory - and an OS that will let you access it... 

Does Windows allow to do it? Should I change I on the Netbackup Media or Master Server?

Cause I'm using media server to backing up those datas

Set the number of buffers on the master and media servers.  You will find more information abouth this in the Performace Guide.

The filenames are:

number_data_buffers
number_data_buffers_restore

These are windows files (text format) without any extension.

Ok, I'll do a test.

thanks!