Snapvault / SnapMirror bandwidth requirements

[pateljayesh]

Are their any tools availabe for sizing bandwidth requirement for Snapvault replication, is FCP link better over IP links if distances are <10km between primary and secondary filers.

I am also trying to find any useful guides, if available, on processor / memory utilization overheads as a result of using snapvault/snapmirror.

Thanks

[z902129mf]

I think both of these have parameters to limit their bandwidth consumption.

For example:

"Snapmirror update" command's "-k" option allows you to throttle the transfer rate at KB/s.

For SnapVault, you have "snapvault start -k" flag and "snapvault update -k" flag to set your throttling speed~

[danielpr]

Yes as Ming said always you can control the transfer limit from Kb,You can find the Adjusting the TCP window size help page from the below link.

http://now.netapp.com/NOW/knowledge/docs/ontap/rel73/html/ontap/onlinebk/protecting/task/t_oc_prot_sm-adjust-tcp-window-size.html

Thanks

Daniel

[jmerrill]

Also, SnapVault doesn't support replication over FC, it's IP replication only.

In addition to the solutions mentioned above, you can set the SnapVault throttle for permanently using the "snapvault modify -k" option.  This would need to be done for each SnapVault relationship, and is static (if a transfer is in progress, the new throttle won't be implemented until the next update).  If you are using SnapMirror, there is a "snapmirror throttle" command that is a dynamic throttle.

Thanks!

Jeremy Merrill
Data Protection Solutions
Technical Marketing Engineer