[89] in 6.033 discussion
Re: Just a question on the stats
littlitt@ATHENA.MIT.EDU (littlitt@ATHENA.MIT.EDU)
Tue Mar 19 23:43:56 1996
arradhak@MIT.EDU writes:
> Subject: Just a question on the stats
> Date: Tue, 19 Mar 1996 22:26:42 EST
>
> I had a question about the NOC stats from the discuss meeting on
> http://www.mit.edu:8008/menelaus.mit.edu/nw/11949
>
>
> The stats list Output and Input in KBytes like:
>
> Output KBytes
>
> w20-rtr.fddi 45018160
> e40-rtr.fddi 44281192
> b4-rtr.fddi 37044072
> w91-rtr-ext.fddi 29758956
> w91-rtr.fddi 29284396
> e19a-rtr.fddi 11326465
> ...
>
> Input KBytes
>
> e40-rtr.fddi 30566140
> w91-rtr.fddi 29046890
> w91-rtr-ext.fddi 28305736
> b24-rtr.fddi 27599998
> b4-rtr.fddi 20244468
> w20-rtr.fddi 19165116
> ...
>
>
> So, if I'm trying to determine the number of bytes being transferred
> in and out of MIT, can I just add w91-rtr-ext.fddi's input and output?
> If so, that puts MIT's daily traffic at close to 60GB a day. Where did
> they get the 20 GB a day figure on the design project home page? Or
> do these numbers mean somthing else?
The 20 GB a day comes from the "from off campus" column in the "ascii
chart" pointer. (http://web.mit.edu/afs/net/admin/noc/backbone/quarterly)
Someone requests a web page, and then the bulk of the traffic is
coming "from off campus" to satisfy the request for the data. (The
design project pointers page does specifically say that the 20 GB is
"traffic from external sources".) This seems consistent with above, as
w91-rtr-ext has ~28 gb of "input" in the chart above. (I'm assuming
that router "input" means traffic coming into MIT.)
Note that the "ascii chart" is an average daily amount for a quarter
of a year, which will probably be a better number than a single
statistic from one day (as from the NW meeting). Although the average
amounts are undoubtedly growing, probably by the week! You could
always go through a bunch of old NW transactions and figure out an
average for the last week or so.
-jon
