I am facing a strange issue.
We have a backup server , to which all application servers ,webservers and db servers copy the files . Before implementing the application (NAS) , we wanted to test the file transfer rate , so we tried normal windows copying "\\serverip " ( which uses port 445).
When i transfered files placing both NAS device and server in the same zone , speed is up to 120Mb/sec. But when i keep NAS device in one zone and copy files from another zone speed is getting drastically down to 10Mb/sec.
I have already opened a TAC case but they were not able to help me out much. But couple of times we have bypassed firewall and tested with putting servers and NAS in same vlan and tested there is no issue with the transfer speed.
Following has already been tested
1) disable NETBIOS inspection on ASA
2) tcp-map , bypassed flags ,cleared windows scale on both ASA and server and client .