ADSM-L

ADSM communication rates

1994-08-22 18:20:40
Subject: ADSM communication rates
From: "Wayne T. Smith" <WTS AT CAPSLAN.CAPS.MAINE DOT EDU>
Date: Mon, 22 Aug 1994 17:20:40 EST
We'd like to hear what some of you have been seeing for ADSM
communications rates, especially in situations as described below.

Scenario 1 - ADSM Netware IP20145 client on a 16meg 486-25 processor
communicating with a VM ADSM server using TCP/IP over a 10Mb/s network
with 1 router involved.

    Typical results:  The ADSM client reports a 800-1000KB/s rate.
    This is 65-80% of the 10Mb/s pipe.

Scenario 2 - ADSM Netware IP20145 client on a 64meg 486 (and similarly
a 16meg 386) class processors communicating with a VM server using
TCP/IP over a 1.5Mb/s (T1) network with 2 routers involved.

    Typical results: The ADSM client reports a 13-20KB/s rate. This is
    only about 10% of the 1.5Mb/s (T1) pipe.

    During initial backup pass, transfer time is as much as 40-60% of
    elapsed time.  Using this same path (but not the same Netware file
    server), FTP can get about 170KB/s; that is, most all of the T1 pipe.

In each case, the measurements were done with little or no network
load.  In each case, the Netware file server is almost useless for
other (than ADSM) tasks, as the cpu is *busy*.  In each case, the
Netware cpu is doing compression.  I'm a little surprised at

1. The 486 and 386 (T1) Netware machines seem to have nearly identical
rates, even when elapsed time is used as a divisor rather than ADSM
communication time.

2. The 10 Mb/s netware machine seems to have a transfer rate 40-75
times that of the 1.5 Mb/s machines.  Except for one additional router, I
can't account for the difference.  I would have expected a 6-10 times
difference.

Any comments?

Wayne T. Smith
Systems Group -- CAPS        internet: wts AT maine.maine DOT edu
University of Maine System   BITNET/CREN: WTS@MAINE
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