what is fragment number on netbackup?

Netbackup break backups into fragments, in order to handle data , lets say backup is 200 GB and youre fragment size is 50GB, then Netbackup will break the backup into 4 fragments.

A additional fragment may be added for TIR backup (When "collect Tru Image Restore data"  is checkmarked in the policy).

image too small so i write new image.

It indicates that the FRAG is a TIR (True image restore). Nothing to worry about.

https://www.veritas.com/support/en_US/article.000032604

I saw -1, didn't have my magnifying glass at hand. Maybe its both.

Thanks to Riaan.Badenhorst and Marianne !

sorry about image.. that expansion is useless..

Then, there is also a 1 or 2,3,4,5 numbers.

This number is probably the same as the netbackup status code?

No, those are actually the fragment number, your IMAGE is made up of 5 Fragments (pieces), 1 - 5. 

thanks for everyone~