On Thu, 1 Jun 1995 18:53:10 -0700 Bill Perry said:
>We are thinking about eliminating our DTCs at one of our sites and
>switching all of the 200 - 300 users to WRQ's Connect 3000.
 
Wish I had your budget :-)
 
>Does anybody know what impact this might have on the HP3000
>performance?
 
Well, several things can happen depending on your environment (and I'm
sure you'll hear several opinions), among them:
 
* Transfer rates between the 3000 and the host will increase (assuming you
  have available 3000 CPU, adequate PC CPU, and enough network bandwidth).
 
* You will have an additional 200-300 processes on your CPU supporting the
  vtservers, plus added transient space and resources used by them.
 
* This is assuming you plan to use NS/VT connections.  One alternative is
  to buy a couple of Telnet Express boxes (or TACs for an existing DTC) and
  use telnet sessions.  This eliminates the vtserver overhead, doesn't
  require WRQ's 3000 Connection (or NS/Open), and is possible with Reflection
  right out of the box if you have an installed Winsock in place.  Just don't
  load the TACs/Telnet Express too heavily.
 
* You certainly don't want 200-300 sessions doing host-based telnet (when it
  is available).
 
* If you have an older box with dual LANICs, you'll be essentially abandoning
  the DTS LANIC and increasing load on the NS LANIC.  If you have a newer box
  with only one LANIC, nevermind :-)
 
We run perhaps 20-30 NS/VT sessions, and the vtserver overhead is nontrivial
in our case (mostly character mode applications) but in any case it is most
certainly measurable.  We also run TAC-based telnet sessions, and although
the load is light (10-20 sessions) they seem to run just fine.
 
I would certainly have my doubts about such a large number of VT sessions,
both from the processor's standpoint and the added cost of network software
to accomplish that goal.  Offloaded telnet (TAC or Telnet Express) appears
to be the most efficient and cost-effective (and open) solution if you are
looking at a volume of users such as yours.
 
[\] Jeff Kell
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