My Netbackup server is connected to the File server via LAN. My same Netbackup 
server is connected to the SAN Switch via Fiber. The File server is also 
connected to the SAN Switch via Fiber. SAN Switch is connected to one Robot 
Library having shared tape drive. I have done the necessary zonning required on 
the SAN Switch to take the traffice on the SAN. I am able to take the backup of 
the File Server through SAN using Media Server. I have done all the necessary 
tunning & buffering in order to increase the speed, it has increased the speed 
but not adequate.

The speed for my backups is 10 MB/S. I have checked even the performance graph 
on the SAN Switch. At  port number 3 SAN Switch is receiving nearly 55 MB/S but 
suddenly it's speed lowers down at nearly 10 MB/S and start transmitting at the 
same speed to tape library. At other end the end from the port 5 of the SAN 
Switch to the Tape Libraray the speed again becomes fast. 

Is it possibe that the SAN Switch is not properly configured. Because I have 
done everything in order to increase the speed from the Netbackup end. I even 
have checked the console of the tape library but to no avail. Can any body 
guide me what are the necessary actions i can take in order to get the desired 
result for the SAN.
I am using Windows Netbackup server 6.5.3. This Netbackup server is installed 
on the 2003 R2. I have made the File Server (FS02), as the second (additional) 
media server for SAN having version 6.5.2. The File Server (FS02) has Windows 
2008. This File Server (FS02) is clustered with another File Server having name 
FS03.

The problem for the low speed is possible due to some cluster issue?
 
Waiting for Quick responses.

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