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Re: Pipeline Production Problems
If your "switches" are really "switches" and not just "hubs"
buying more switches will not buy you more bandwidth.
Any modern switch can support 100 Mbps both inpt and
out put on all ports all at once. Even the cheap
switchs are NxN crossbar with gigabit level
backplanes. Darn impressive for $100. Check that you
do have "switches".
If you want to increase bandwidth there are two ways to go:
1) Put multiple 100BaseT cards in each computer
2) Convert over the 1000BaseT. It is not all that
expensve anymore. This is a 10X boost.
#2 gives the most "bang for the buck" and is 100% transparent
to the software. #1 will require that you learn a little
about routing tables and sub-nets.
These are switches that alow mixed 1000/100/10 Mps cables
and they will do all the rate conversions intraly. The
"typical" setup is to have one file server with a 1000aseT
interface plug into the swith and all the user macine
have 100BaseT. In theoory the server then can feed 10
user boxes at the full 100 Mbps rate.
--- Thomas Droege <tdroege2@earthlink.net> wrote:
> Thanks to everyone for the help.
>
> Well, the "service nfs restart" also did not work.
>
> OK, my theory is that if one of you cannot instantly tell me what to
> do,
> then I am trying to do something that I should not be trying to do.
>
> I appreciate Crhis's comments on what should fail. Note that I have
> everything set up so that one failure only knocks out one thing.
> Well, I
> made the mistake of buying a couple of dual processor machines. This
> on
> the theory that I could then have some machines with big memory to do
> things that big memory can do. Not necessary for the pipeline, but
> nice
> for the data reduction.
>
> Since this has been a problem for a while now, my general thinking is
> to
> quit trying to use the dual processor machines. Just add a couple
> more
> single processor machines and run one process per machine. Then if
> one
> hangs I can restart it. This is not so wasteful since I can then run
> the
> dual processor machines with big memory doing data reduction looking
> for
> variables.
>
> Now a question on networks:
>
> Suppose I have the following setup:
>
> Computer A connects to switch 1 which also connects to Computer B
> Computer C connects to switch 2 which also connects to Computer D
>
> This should logically support full speed transmission between
> Computer A
> and Computer B with also full speed transmission between compute C
> and
> computer D. They are two completely isolated networks.
>
> Now I add a cable between switch 1 and swi;tch 2.
>
> What happens? Does the network slow down, or are the network boxes
> smart
> enough to configure things for the highest possible transmission
> speed?
> Suppose I have a more complicated network where it is possible to
> make a
> bad routing choice. Is the system smart enough to figure out the
> best way
> to route the data?
>
> From the looks of things, the transmission speed goes down as I start
> each
> transfer process going. I could add some extra cables so that the
> possible
> routes had parallel cables if the system is smart enough to make use
> of
> them.
>
> Tom Droege
>
>
>
>
> > [Original Message]
> > From: Chris Albertson <chrisalbertson90278@yahoo.com>
> > To: <tdroege2@earthlink.net>; Robert Creager
> <creagrs@louisville.stortek.com>
> > Cc: tass <tass@listserv.wwa.com>
> > Date: 10/13/2003 2:48:26 PM
> > Subject: Re: Pipeline Production Problems
> >
> >
> > You'll notice where I said "the task is to find which script
> > to run". But "xxx restart" or "xxx stop; xxx start" is still
> > likely the way to go.
> >
> > How exactly are the Windoes files made available on the Linux
> > Machines?
> >
> > One other "cheap workaround" might be to change your setup
> > so the Linux files are __exported to__ the Windows boxes
> > then the Windows machine writes data to what it sees as a
> > "share" then at least when Windows hangs Linux can still access
> > the files.
> >
> > Y are gettint to the pint where you might just want to set up one
> > "file server" on a Linux machine to export a data directory
> > using both NFT and SMB so all 2,000 or so of your computers can
> > see al the files. People might argue that "putting all the eggs
> > in one basket" is not the right way to go but using multiple
> > file servers means multiple systems have to work. You know
> > probability theory ... with multiple machine your _multiply_
> > the chance of one breaking to compute the change of a system
> > failure. Better to multiply by 1.0
> >
> > Also with only one file server you can better afford tricks like
> RAID
> > and mirrord disks so you can continue working through a hardware
> > failure. Yes, amazingly you _can_ pull the IDE data cable off a
> > working system disk and not crash.
> >
> >
> >
> >
> >
> > --- Thomas Droege <tdroege2@earthlink.net> wrote:
> > > Rob and all,
> > >
> > > The "service network restart" does it's thing. I then go back
> to
> > > user
> > > level and tried;
> > >
> > > cd /mnt/leejohn/newfol
> > >
> > > And it hung - indefinitely so far. 5 games of free cell
> > >
> > > Tom Droege
> > >
> > >
> > > > [Original Message]
> > > > From: Robert Creager <creagrs@louisville.stortek.com>
> > > > To: <tdroege2@earthlink.net>
> > > > Cc: tass <tass@listserv.wwa.com>
> > > > Date: 10/13/2003 1:15:37 PM
> > > > Subject: Re: Pipeline Production Problems
> > > >
> > > > During the interrogation, at Mon, 13 Oct 2003 13:00:46 -0500,
> > > > "Thomas Droege" <tdroege2@earthlink.net> made the following
> > > confession:
> > > >
> > > > > Is there a way to get communication with a Windows 98
> computer
> > > > > restarted without rebooting the linux machine?
> > > >
> > > > Try as root <service network restart> and see what happens.
> > >
> > >
> > >
> >
> >
> > =====
> > Chris Albertson
> > Home: 310-376-1029 chrisalbertson90278@yahoo.com
> > Cell: 310-990-7550
> > Office: 310-336-5189 Christopher.J.Albertson@aero.org
> > KG6OMK
> >
> > __________________________________
> > Do you Yahoo!?
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>
>
=====
Chris Albertson
Home: 310-376-1029 chrisalbertson90278@yahoo.com
Cell: 310-990-7550
Office: 310-336-5189 Christopher.J.Albertson@aero.org
KG6OMK
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