dstempien wrote:
> how would one prepare for a failure scenario in any one these servers?


It's not much different from having all three on the same server; you'll want 
to keep backups and all the usual stuff.  It's complicated a bit by the size of 
the IMDC & Flows databases, but conceptually it's the same problem.

The only thing that's unique to this situation is the possibility of using the 
other machines as spares.  I don't know offhand whether you need additional 
licenses for this, but in theory you could have IM installed on all three 
servers.  If the dedicated IM machine ever went down, you'd then have two 
standbys.

Unfortunately the process of keeping the spares in sync is a bit clumsy; you 
can do it by copying files or via IM's HTTP API.  Either way it's an incomplete 
sync, and there are some hiccups to getting the database to recognize that it's 
really the same IM server reporting, just from a different IP.  With some work 
you can get a basic standby setup, and we have customers who do that, but 
there's a lot we still need to do on our end before that's an 
officially-supported path.


dstempien wrote:
> what front-ends they are using or have developed for referencing and 
> reporting on their data?


I don't have a complete picture, since I hear mainly from people who have 
encountered some problem or want things to work differently.  IMDC of course 
includes its own front-end, Reports, that many people use.  It's not at the 
point where it can replace a real reporting dashboard, but we're adding to it 
in every release.  Aside from that there are some people using Crystal Reports, 
and several have custom interfaces; scripts that connect directly to the 
database.

In terms of what people query, that varies a lot depending on the kinds of 
devices they're probing.  Events - when devices go down or otherwise change 
state - are probably the most common target, since IM on its own keeps no 
history of those changes.  The built-in Reports front-end, especially with the 
new datasets we added in 5.5, works pretty well for that.

David

-----------
David Schnur
Dartware, LLC


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