RE: A89: Me distributing roms.

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RE: A89: Me distributing roms.


Well, you need to consider two more things:

1) RAID arrays. For example, a single 18Gb drive can saturate a fibrechannel
if you are doing sequential read (100Mbytes/sec). Now, you never do
sequential read, but generally you say that 4 disks can saturate a SCSI
channel, so say 8 ro 10 disks to saturate the fibrechannel. Then stick 10-15
of those controllers in your box, and you are at those speeds, with a total
of only about 100 disks (this is with full fault tolerance). You will need
multiple PCI busses too, to sustain these speeds, btw. (And no, these are
not unusual configurations for large systems. A typical *cheap* TPC system
uses somewhere between 400 and 800 disks).

2) Cache. If you are serving things at this speed, you would more normally
be serving a lot of stuff out of you cace. Stash 8Gb of RAM in your box, and
you can cache most of what you need.

Then again, somebody has to be able to read at that speed. And that is not
something you can very much do over the internet today. The backbone links
just can't handle it.

//Magnus

> -----Original Message-----
> From: Bryan Rabeler [mailto:rabelerb@pilot.msu.edu]
> Sent: Saturday, January 15, 2000 12:44 AM
> To: assembly-89@lists.ticalc.org
> Subject: Re: A89: Me distributing roms.
> 
> 
> 
> I don't think even the best SCSI HDs in the world could write 
> to disk that
> fast...
> 
> Bryan
> 
> ----- Original Message -----
> From: "Serial" <Serial@earthlink.net>
> To: <assembly-89@lists.ticalc.org>
> Sent: Friday, January 14, 2000 5:32 PM
> Subject: Re: A89: Me distributing roms.
> 
> 
> and for that matter it'd take a nice juicy set of comps with 
> scsi hd's to take
> advantage of the line speed. I mean to hear some lamer say 
> he's piped into an
> OC192 is humorous to say the least.
> 
> ----- Original Message -----
> From: Magnus Hagander <mha@sollentuna.net>
> To: <assembly-89@lists.ticalc.org>
> Sent: Friday, January 14, 2000 12:29 AM
> Subject: RE: A89: Me distributing roms.
> 
> 
> >
> > (note - OCn = STS-n when it comes to speed)
> >
> > OC-1 is 51.84Mbps.
> >
> > Then just multiply the "OC-number" by that, so:
> > OC-3 is 155.52Mbps
> > OC-12 is 622.08Mbps
> > OC-48 is 2.48832Gbps
> > OC-192 is 9.95328Gbps
> >
> > Basically, what STS-n does is it multiplexes n STS-1 frames 
> on a single
> > connection.
> >
> >
> > On that subject, show me a server that can put out OC-192 
> worth of bandwidth
> > :-) Or for that matter, an internet backbone connection 
> point that can
> > sustain anything near that.
> >
> > file://Magnus
> >
> >
> > > -----Original Message-----
> > > From: Bryan Rabeler [mailto:rabelerb@pilot.msu.edu]
> > > Sent: den 14 januari 2000 03:21
> > > To: assembly-89@lists.ticalc.org
> > > Subject: Re: A89: Me distributing roms.
> > >
> > >
> > >
> > > Well, how do you know how many mbit/gbit a OCxx is?
> > >
> > > Bryan
> > >
> > > ----- Original Message -----
> > > From: "Serial" <Serial@earthlink.net>
> > > To: <assembly-89@lists.ticalc.org>
> > > Sent: Thursday, January 13, 2000 8:09 PM
> > > Subject: RE: A89: Me distributing roms.
> > >
> > >
> > > >
> > > > I believe his math is wrong. The OC256 that at&t is laying
> > > across the
> > > > atlantic to connect the 2 continents is a 2 gbit line which
> > > would roughly be
> > > > ~200meg/s
> > > > the quick conversion for (g)(m)(k)bits/s is to just add 2
> > > zero's and reduce
> > > > to a lower letter if nessessary.
> > > > for example. a 56kbit modem like an x2 is really 5.6 
> kilobytes max
> > > > downstream
> > > > and a 384k/s downstream dsl would be ~38.4 kilobytes /s
> > > > a 1mbit cable line would be 100kilobytes per second. etc.
> > > > I may not know how to do anything but hello world in asm
> > > but networking I do
> > > > know =]
> > > >
> > > > -----Original Message-----
> > > > From: owner-assembly-89@lists.ticalc.org
> > > > [mailto:owner-assembly-89@lists.ticalc.org]On Behalf Of
> > > Bryan Rabeler
> > > > Sent: Thursday, January 13, 2000 3:17 PM
> > > > To: assembly-89@lists.ticalc.org
> > > > Subject: Re: A89: Me distributing roms.
> > > >
> > > >
> > > >
> > > > How did you calculate that?
> > > >
> > > > Bryan
> > > >
> > > > ----- Original Message -----
> > > > From: "Mark Scott" <mscott@rocket.mscott.dbcity.com>
> > > > To: <assembly-89@lists.ticalc.org>
> > > > Sent: Thursday, January 13, 2000 4:46 PM
> > > > Subject: RE: A89: Me distributing roms.
> > > >
> > > >
> > > > > Around 8.5gbps if my math is correct.  Equivalent to 
> 192 T3 lines.
> > > > >
> > > > > Mark E. Scott Jr.
> > > > > mscott@databasecity.com
> > > > >
> > > > > -----Original Message-----
> > > > > From: Bryan Rabeler [mailto:rabelerb@pilot.msu.edu]
> > > > > Sent: Thursday, January 13, 2000 4:34 PM
> > > > > To: assembly-89@lists.ticalc.org
> > > > > Subject: Re: A89: Me distributing roms.
> > > > >
> > > > >
> > > > > How fast is an OC192 again?
> > > > >
> > > > > Bryan
> > > > >
> > > > > ----- Original Message -----
> > > > > From: "Mark Scott" <mscott@rocket.mscott.dbcity.com>
> > > > > To: <assembly-89@lists.ticalc.org>
> > > > > Sent: Thursday, January 13, 2000 4:06 PM
> > > > > Subject: RE: A89: Me distributing roms.
> > > > >
> > > > >
> > > > > > Send me the roms in an email and I'll throw em on a
> > > server that's on
> > > > > an
> > > > > > OC192.
> > > > > >
> > > > > > Mark E. Scott Jr.
> > > > > > mscott@databasecity.com
> > > > > >
> > > > > > -----Original Message-----
> > > > > > From: Olle Hedman [mailto:oh@hem.passagen.se]
> > > > > > Sent: Thursday, January 13, 2000 4:02 PM
> > > > > > To: asm89
> > > > > > Subject: A89: Me distributing roms.
> > > > > >
> > > > > >
> > > > > > This week might be the last one I distribute old ti-roms.
> > > > > > Someone has reported me to abuse@liu.se (my
> > > university), and to TI.
> > > > > > Same someone did not contact me.
> > > > > > I recieved the call from "abuse" today. He was very nice and
> > > > > > understanding and I
> > > > > > think he thought it was quite silly, but that he just
> > > had to talk with
> > > > > > me
> > > > > > because of this letter.
> > > > > > I got a week to either remove them, or come up with a
> > > valid reason for
> > > > > > me to
> > > > > > continue having them.
> > > > > > I have yet not gotten any response from TI, but they
> > > have visited my
> > > > > > site.
> > > > > > I'm eagerly awaiting their letter :)
> > > > > >
> > > > > > file://Olle
> > > > > >
> > > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > >
> > >
> >
> >
> 
> 
>