Hi all,
We're running snapvaults across a WAN link and we'd like to make sure we're getting the best performance possible. Both for the initial transfer, and for the followup snapshots which sync up the systems. All the systems are running OnTap 7.0.1 currently. The source filers are F960s or F270s, so they've got plenty of oomph.
The network is all Gigabit on the LAN side.
We have a WAN setup with 45mbit/sec and 90mbit/sec links between various sites. But the latency is on the order of 90ms, which means that we want to have a TCP Window Size of around 2Mb to keep up streaming performance.
I've been looking around, but I don't see anything which explicity addresses LFN (Large Fat Network) WAN links like this under snapvault, esp when there's a large latency in the loop.
Does anyone have any pointers on what I can do to:
1) tune the TCP stack for better performance
2) monitor the Network settings (internally, I know I could use ethereal or some other external snoop tool).
3) get better stats out of snapvault for how the transfer is going, and how long it's going to take to Quiesce snapvaults. I've had some which are going on 300+ hours!
4) What other people are doing in this situation to monitor and control large numbers of snapvaults (we're doing per-qtree) across WAN links.
Thanks, John John Stoffel - Senior Staff Systems Administrator - System LSI Group Toshiba America Electronic Components, Inc. - http://www.toshiba.com/taec john.stoffel@taec.toshiba.com - 508-486-1087