ADSM-L

Re: Through Put for MVS Server

1996-12-11 15:18:14
Subject: Re: Through Put for MVS Server
From: Paul Jaffray <pjaffray AT EARTHLINK DOT NET>
Date: Wed, 11 Dec 1996 15:18:14 -0500
At 10:16 AM -0800 12/11/96, Bruce_Heckler AT ADCOM-OPERATIONS.ucsd DOT edu 
wrote:
>Holy Toledo Jaffray!
>
>Your configuration is almost the same as ours, with the exception we're
>running Interlink TCP/IP through FDDI.  However most of our workstations
>are hooked off Novell 10-T lans, which makes the "pipe" same size as yours.
>
>Worst case, we're seeing a half meg a second.  Best case is around 2 megs a
>second.  And so far, it's about double for our Sun's hooked directly to FDDI.
>Network traffic is much lower than expected.  About what you'd expect
>doing an
>FTP on the Internet.
>

Thanks for the info, although I do have a question.  How are you
determining the through put?  When I do a backup from Win95 and watch the
numbers on the screen I can't make the math work out (maybe it is some kind
of bizzare University math).  As an example, Bytes Transfered = 31,919 KB,
Time = 00:20:50, Transfer rate = approx 1000KB/sec (I didn't write that
number down).  Now if I do the math and divide the bytes transfered by the
number of seconds (31913 / 1250) I get 25.5 KB/sec! Somewhat short of the
reported 1000KB/sec.  So what stupid thing did I do?  What am I missing?

Also, assuming I still remember how to do math (questionable at the best of
times), a 10Mb(it)/sec Ethernet connection should only be able to transfer
1280KB(ytes)/sec. ie. 10(Mbits) * 1024 * 1024 = 10485760 bits/sec, then
divide by 8 for Bytes/sec = 1310720, then divide by 1024 for KB/sec =
1280KB/sec. If I did it right, how then do you achieve through put of
2048KB/sec?

On the plus side, if I can get at least 2MB/sec I figure it should only
take me approx 7 hrs to backup the 50GB.  If I can get 4MB/sec, it should
only take 3.5 hrs.

Again thanks for your response, hope I haven't taken up too much of your time.

pdj

Paul D. Jaffray
pjaffray AT earthlink DOT net
"This Farm Uses John Deere Tractors"
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