Consider also Qos on the routers at very least, segregate your traffic
via CBWFQ (Cisco) or whatever vendor solution supports queuing.  You
don't want disk sync's to swat other important traffic.

Is the environment use windows DFS or anything?  FRS was crap, but DFS-R
(R2) might provide adherence to bandwidth limits on site-based
replication.  I'm looking at giving iscsi targets to windows off a local
san (OF), and giving DFS-R a try to manage replications and such, just
not sure how it stretches yet.  Not positive, but worth a look if DFS is
front-ending a windows server/client environment for your needs,
supposedly it has wan-friendly qualities for such occasion.  Doesn't
solve all issues, but may in some cases.

-mb


On Wed, 2009-07-29 at 14:06 -0700, Stephen wrote:
> We are useing an openfiler server here and it has been running great.
> 
> right now it is hosting several iSCSI connections to our servers
> however we need to replicate data on one of the iSCSI volumes between
> 2 sites.
> 
> internally using DRBD/heartbeat comes to mind as a new but no brainer
> solution. however these servers need to live in 2 different states
> (and eventually maybe 3-4 locations)
> 
> generally it would seem that rsync would be better however it is a
> file level replication and seems that it would not be able to
> replicate the iSCSI volume which is block level...
> 
> can DRBD/heartbeat sync across a t-1 or pair of bonded t-1's? or will
> it eat the pipe?
> 

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