Conference irocz::terminal_servers

3496.0. "LAT Ratings for Multiple Port Services" by CSC32::L_DEGROFF () Tue Apr 08 1997 16:35

    Have a customer, NBC, which is currently using hundreds of DS200s,
    DS300s, and DS700s to offer reverse-LAT connections to their staffs
    worldwide.  The have setup the terminal servers to offer a limited
    number of services over multiple terminal servers.  In other words,
    the service NBC may be offerred on all ports of 40-50 terminal servers.
    
    They say that the service rating which usually is 255 when no one
    is connected stays at 255 with six ports connected.  Please confirm the
    following:
    
    rating with no connections=   255
    minus set-aside for queuing=  -90
    equals total rating available ---
    for all ports                 165
    devided by the no. of ports   165 devided by 8
    equals drop in rating per
    connection                    ~21
    
    So, then with six of eight ports connected, the rating should have
    been 255-126=129 approximately.
    
    Thanks
    
    Larry  

From the current DNAS code, it appears that the rating algorithm is as follows:

If connections are not enabled or the server-wide service enabled bit is not
set, the rating is zero.

Otherwise, if any ports are available, the rating is:

    (105 + (150 x (<number_of_free_ports>/<total_number_of_service_ports>)))

If no service ports are available, the rating depends on the queue depth.  If
service queuing is not enabled, the rating is 0.  Otherwise, the rating is:

    (90 x (<number_of_free_queue_entries>/<total_queue_depth))

I don't have access to the old DS200 code.  The rating algorithm implemented
by that code base might be very different than the current algorithm.  What
version of software are the DS700s running?

Jim

    Jim,
    
    Thanks for your prompt reply.  The DS700s are running v1.1.
    
    Larry