TCP tuning for system recovery

Hello everyone,
I'm involved in a DRP exercise, and I'm trying to improve the performance of the restores from tape. I've got side-by-side Windows and Solaris 9/10 servers and the Solaris boxes are seeing about half the bandwidth of the Windows boxes.
The systems are Gbe everywhere, including the backup server. The Solaris boxes are booted from CD/DVD and we then run the recovery software off an NFS share. My restores are maxing out at about 16Mbps on Gbe links. My enemy Windows servers are running at about 25-30Mbps, also rather slow, but better.
I'm not looking for miraculous solutions, but if I can bring the data rate up a bit with some simple changes, that would be great. I was wondering whether any TCP parameters might help.
Any pointers/tips would be appreciated.
Thanks,
Mark
Edited by: MarkDrummond on 4-Jun-2009 9:01 PM

Robert,
Good point, I should be looking at disk performance. The recovery software takes over the console so I have no way to get back to the CLI. I'll have to investigate that.
We did have some luck with one server, a V440. Hardcoding the switch port and the server port to 1000fdx, and setting a few TCP parameters did get this one server up to ~115Mbps, a dramatic improvement over previous results.
tcp_max_buf
tcp_cwnd_buf
tcp_xmit_hiwat
tcp_recv_hiwat
In our data centre, we are copper Gbe everywhere, on Cisco gear, we leave all ports to autoconfig, don't do any TCP tuning, and I get about 700Mbps between servers. But our DRP partner insists that we should hardcode everything here at our DRP site. It's all Gbe and Cisco here too. Very strange, but auto causes a lot of grief around here.
Thanks again,
Mark

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    Are you having trouble starting into your HP Tablet? Are you getting error messages, or blank screens? Not sure what to do next? You may need to perform a System Recovery.
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    Always remember to back up all personal files and read all caution statements before Performing an HP System Recovery (Windows 8)
    HevnLgh
    I work on behalf of HP
    Please click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution.
    Click the “Kudos Thumbs Up" to the left of the reply button to say “Thanks” for helping!

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