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The fact that you are getting 50 MB/s to the switch tells me that something down stream. Your server configuration is probably fine. Here are some things you can check:
1. The speed and type of the port the tape library is connected to. A speed of 10 MB/s can be caused by port mismatch for zoning. This probably will not be the problem.
2. The speed of the fibre connection to the tape drive or library. This is similar to the switch. You might be having the fibre bridge on your library hard coded to 1 gig while the switch is 2 gig. There may also be a configuration on the bridge that sets the speed to the tape drive. It could be set to a low speed.
Jeff
On Tue, Mar 30, 2010 at 4:49 PM, qiblatain <netbackup-forum AT backupcentral DOT com> wrote:
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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Jeff Cleverley
Unix Systems Administrator
4380 Ziegler Road
Fort Collins, Colorado 80525
970-288-4611
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