[Info-vax] SCS over IP

[11brvo at gmail.com]

On Wednesday, October 30, 2013 10:33:39 AM UTC-4, Stephen Hoffman wrote:
> On 2013-10-30 12:54:37 +0000, said:
> 
> 
> 
> > Is there any advantage to using SCS over IP as opposed to hard-wiring a 
> 
> > two node Integrity cluster together for SCS traffic?
> 
> > 
> 
> > The two nodes in question are rx2800s and are geographically co-located 
> 
> > with minimal distance between the two.  However, future plans might 
> 
> > entail the addition of a third node into the cluster with this 
> 
> > additional node being geographically distant from the other two. (DR 
> 
> > purposes.)  Both rx2800s run v8.4
> 
> 
> 
> Any advantage?  Here?   I don't see one.
> 
> 
> 
> SCS over IP is effectively a software replacement for Ethernet bridge hardware.
> 
> 
> 
> Native SCS is faster and lower overhead, and will be the preferred path 
> 
> even if SCS over IP is configured.
> 
> 
> 
> If and when that "future plans might..." status becomes "immanent real 
> 
> physical hardware" status (and not some variation on "the end is nigh" 
> 
> status, or fodder for the latest episode of "Port That Code!!") and if 
> 
> and when you do not have an Ethernet bridge available between the two 
> 
> sites, then you can look at adding SCS via IP.
> 
> 
> 
> For the remote connection, you're going to need a network connection 
> 
> commensurate with the volume of likely-shadowed data, and the rest of 
> 
> the DT baggage that gets discussed, too.  For various folks, shipping 
> 
> shadowset clones or tapes or such is more cost-effective.
> 
> 
> 
> Could somebody justify SCS over IP here?  Probably.  There are some 
> 
> other details that may or may not be of interest, such as SCS over IP 
> 
> supposedly also encrypting, though I don't know of any third-party 
> 
> studies of the particular implementation.  But on an Ethernet, native, 
> 
> classic, unencrypted SCS will be preferred when that's available.  Or 
> 
> somebody will suggest not having to reboot the cluster when adding the 
> 
> DT host, but in my experience that's fairly rarely an absolute 
> 
> constraint for sites running two bottom-tier servers.
> 
> 
> 
> 
> 
> 
> 
> 
> 
> -- 
> 
> Pure Personal Opinion | HoffmanLabs LLC

Thanks for your input Steve: 'preciate it.