Low Transfer Rate in a New NIC

[jssanche]

Hi there!

I have a TSM 7.1 server running on WINDOWS 2012 R2. Recently a new network interface connection to 10 GBPS was enabled between this TSM server and some SUSE LINUX servers. Apparently we have not been able to adjust the TSM Client parameters (DSM.SYS) in order to use those 10 GBPS bandwidth. We made a lot of changes in tsm variables such as TCPBUFFSIZE, TCPWINDOWSIZE, TXNBYTELIMIT etc. with no results.

Backups data are always sent to the TSM server at 350 KBS speed, so the 10GBPS bandwidth is not in use. At this point we begin to think that something remains to be configured on the side of the TSM SERVER.

Any ideas or comments?

Thanks in advance.

 

[jssanche]

NIC transfer rate

 

[marclant]

What transfer rate do you get if you FTP from a client host to the server host?
If the same, you eliminate Spectrum Protect from the equation.
If as expected, then you know you can try some tuning at the client and server levels.

Is the link speed and duplex set to Auto-negotiate or fixed at 10Gbps? Some adapters and switches don't do well with auto-negotiate.

By the screenshot, looks like Windows, a TCPWINDOWSIZE of 0 is preferred, this lets the OS auto-tune the tcpwindowsize. By the way, TCPWINDOWSIZE is for receiving data, so you tune it on the server for backups, and tune it on the clients for restores. However, given the low throughput, I suspect there's more to it than just tuning the tcpwindowsize.