[90085] in North American Network Operators' Group
RE: data center space
daemon@ATHENA.MIT.EDU (Lincoln Dale)
Tue Apr 25 00:29:55 2006
From: "Lincoln Dale" <ltd@interlink.com.au>
To: "'Jim Popovitch'" <jimpop@yahoo.com>, "'nanog'" <nanog@merit.edu>
Date: Tue, 25 Apr 2006 14:27:56 +1000
In-Reply-To: <444D8CE3.3020408@yahoo.com>
Errors-To: owner-nanog@merit.edu
> Lincoln Dale wrote:
> >
> > I suggest you talk to some of the folks you work with that have to deal
> with
> > synchronous replication.
> >
> > In the world of storage networking & synchronous I/O, typically anything
> > higher than 1 msec round-trip latency is too high.
>
> True, but 2ms latency in syncing a backup system is much better than 1
> month complete loss of service due to *poor* continuity planning. We
> all know what the next big threats are (nuclear and/or biological), is
> it worth the risk that the next (and there will be) event is small
> enough not to affect an area 65 miles across?
Once again, I suggest you talk to the folks you work with that deal with
replication.
My experience is that "large NY financials" do both sync replication for <90
miles and then async replication to a third tertiary location that is 200+
miles away.
Not sure I agree with your on where you think the next big threats are ..
but I don't think we could discuss that with any signal:noise ratio!
cheers,
lincoln.
