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I have an Ultra 10 running Solaris 8 controlling a mass spectrometer
via an ethernet connection.
We can also connect to the Ultra via ssh to download files and do
whatever.

Lately it seems, when people are downloading files the connection to
the mass spec gets stomped
and the program that handles communication between the Ultra and the
mass spec dies or stalls.
I'm told it doesn't happen all the time, but fairly often.

The Ultra 10, the mass spec, a printer and a PC all connect to a hub
(an Inmac Microhub 4
4x10BaseT + AUI hub). Further, there's a connection between the hub
and a Linksys home
router which goes to the cloud.

It's been suggested that throwing a second NIC on the Ultra 10 and
having that as a dedicated
connection to the mass spec might/will solve our problem. Would a
second NIC have a reasonable
chance of fixing my problem? Why or why not?

My thought is to first, replace the existing hub with a little 5-port
switch (I have a Netgear FS-105
sitting around as a spare). If that doesn't work I'm thinking about
futzing with the nice level of
either sshd or the mass spec's server program to give the server
program priority over ssh, but
here I'm in deep water. Would either of these steps be as or more
likely to fix my problem (I'd
prefer not to install and configure a second NIC)?

Also if anyone has any thoughts as to what more I could be doing to
get a better understanding of
this problem I'd appreciate hearing it. I don't much network
troubleshooting and this problem seems
to be really far under the hood for me.

Thanks in advance,
eric

Eric wrote:
> I have an Ultra 10 running Solaris 8 controlling a mass spectrometer
> via an ethernet connection.
> We can also connect to the Ultra via ssh to download files and do
> whatever.
>
> Lately it seems, when people are downloading files the connection to
> the mass spec gets stomped
> and the program that handles communication between the Ultra and the
> mass spec dies or stalls.
> I'm told it doesn't happen all the time, but fairly often.
>
> The Ultra 10, the mass spec, a printer and a PC all connect to a hub
> (an Inmac Microhub 4
> 4x10BaseT + AUI hub). Further, there's a connection between the hub
> and a Linksys home
> router which goes to the cloud.
>
> It's been suggested that throwing a second NIC on the Ultra 10 and
> having that as a dedicated
> connection to the mass spec might/will solve our problem. Would a
> second NIC have a reasonable
> chance of fixing my problem? Why or why not?
>
> My thought is to first, replace the existing hub with a little 5-port
> switch (I have a Netgear FS-105
<snip>

It would have been my first thought also. A hub just begs for
collisions; the switch would be a cleaner way to go. If the mass spec
isn't too bright, it might not be handling collisions properly. It has
been a while since I've seen an unswitched network; my own hub has been
gathering dust for several years now. If the people who designed the
mass spec were thinking in terms of switched, the mass spec may not be
able to handle a shared net.

Richard B. Gilbert <rgilbert88@comcast.net> wrote:
> It would have been my first thought also. A hub just begs for
> collisions;

I don't think that collisions in and of themselves would be the issue
as much as shared bandwidth. Unless... the downloads to the system
controlling the mass spectrometer are triggering capture effect. But
that would IIRC require that the link into the cloud from the Linksys
had a bandwidth close to that of 10BT.

> the switch would be a cleaner way to go. If the mass
> spec isn't too bright, it might not be handling collisions properly.
> It has been a while since I've seen an unswitched network; my own
> hub has been gathering dust for several years now. If the people
> who designed the mass spec were thinking in terms of switched, the
> mass spec may not be able to handle a shared net.

Is this a 100BT switch? If it is a "plain" 10BT switch, then since
the initial problem statment suggested most of the downloads are to
the system controlling the mass spectrometer it would need to be a
100BT switch to make much of a difference. Just going to a 10BT
switch would only help if there was a lot of traffic involving systems
other than the one controlling the mass spectrometer.

It would also be interesting to know a little bit more about the CPU
utilization on the system controlling the mass spectrometer.
Particularly while some of these downloads are taking place.

rick jones
from the peanut gallery
--
oxymoron n, commuter in a gas-guzzling luxury SUV with an American flag
these opinions are mine, all mine; HP might not want them anyway...
feel free to post, OR email to rick.jones2 in hp.com but NOT BOTH...

Richard:

The vendor supplied the hub with the mass spec so I'm fairly sure
they weren't thinking switched network as a requirement. The
computer on the mass spec itself is, I believe, a Motorola VME
based single board computer. No idea what kind of network
interface it has. The vendor refers to it as a "real time"
controller.
If they mean "real time" there may be some hairy timing issues
that are only now, after seven years, manifesting themselves.
I doubt that they tested the network under load.


Rick:

What's a "plain" 10BT switch? Everything I've seen over the last
several years have been 10/100 switches. The switch I'm thinking
of using is a 10/100BT switch with (they say) auto config of
speed, xover, and duplex.

Let me clarify, the downloading is going _from_ the Sun into the
cloud, mostly.

Typically, the Sun is talking to the mass spec, let's say, all the
time.
Sometimes to frequently someone(s) from a remote pc will connect
to the Sun to run an interactive shell session or transfer files.
That's
a day in the life of the mass spec's network.

CPU utilization and maybe a snoop/tcpdump study (gotta figure out
how to run snoop/tcpdump first, though).


regards,
eric

Eric <einazaki668@yahoo.com> wrote:
> I have an Ultra 10 running Solaris 8 controlling a mass spectrometer
> via an ethernet connection.
> We can also connect to the Ultra via ssh to download files and do
> whatever.
>
> Lately it seems, when people are downloading files the connection to
> the mass spec gets stomped
> and the program that handles communication between the Ultra and the
> mass spec dies or stalls.
> I'm told it doesn't happen all the time, but fairly often.
>
> The Ultra 10, the mass spec, a printer and a PC all connect to a hub
> (an Inmac Microhub 4
> 4x10BaseT + AUI hub). Further, there's a connection between the hub

ha, wow. an inmac. How old is this thing?

I'd suggest replacing hubs or checking cables before tossing in new nics,
especially considering that 10Mb networks aren't going to tax an ultra10
in the first place.

On Apr 2, 8:39 am, Cydrome Leader <prese...@MUNGEpanix.com> wrote:
> Eric <einazaki...@yahoo.com> wrote:
> > I have an Ultra 10 running Solaris 8 controlling a mass spectrometer
> > via an ethernet connection.
> > We can also connect to the Ultra via ssh to download files and do
> > whatever.
>
> > Lately it seems, when people are downloading files the connection to
> > the mass spec gets stomped
> > and the program that handles communication between the Ultra and the
> > mass spec dies or stalls.
> > I'm told it doesn't happen all the time, but fairly often.
>
> > The Ultra 10, the mass spec, a printer and a PC all connect to a hub
> > (an Inmac Microhub 4
> > 4x10BaseT + AUI hub). Further, there's a connection between the hub
>
> ha, wow. an inmac. How old is this thing?
>
> I'd suggest replacing hubs or checking cables before tossing in new nics,
> especially considering that 10Mb networks aren't going to tax an ultra10
> in the first place.

We've had the mass spec for about seven years. It was also the mfg's
proto
so the instrument itself is probably around ten or more years old. If
that hub
was with the instrument the whole time I wouldn't be a bit surprised.

And tell me, when was the last time you saw an AUI connector on
anything?

thanks,
eric

Eric wrote:
> On Apr 2, 8:39 am, Cydrome Leader <prese...@MUNGEpanix.com> wrote:
>
>>Eric <einazaki...@yahoo.com> wrote:
>>
>>>I have an Ultra 10 running Solaris 8 controlling a mass spectrometer
>>>via an ethernet connection.
>>>We can also connect to the Ultra via ssh to download files and do
>>>whatever.
>>
>>>Lately it seems, when people are downloading files the connection to
>>>the mass spec gets stomped
>>>and the program that handles communication between the Ultra and the
>>>mass spec dies or stalls.
>>>I'm told it doesn't happen all the time, but fairly often.
>>
>>>The Ultra 10, the mass spec, a printer and a PC all connect to a hub
>>>(an Inmac Microhub 4
>>>4x10BaseT + AUI hub). Further, there's a connection between the hub
>>
>>ha, wow. an inmac. How old is this thing?
>>
>>I'd suggest replacing hubs or checking cables before tossing in new nics,
>>especially considering that 10Mb networks aren't going to tax an ultra10
>>in the first place.
>
>
> We've had the mass spec for about seven years. It was also the mfg's
> proto
> so the instrument itself is probably around ten or more years old. If
> that hub
> was with the instrument the whole time I wouldn't be a bit surprised.
>
> And tell me, when was the last time you saw an AUI connector on
> anything?
>
> thanks,
> eric

I still have a box with an AUI connector. I even have a 10BT
transceiver to go with it. It's been years since it was powered on but
it's still there. . . .

Eric <einazaki668@yahoo.com> wrote:
> On Apr 2, 8:39 am, Cydrome Leader <prese...@MUNGEpanix.com> wrote:
>> Eric <einazaki...@yahoo.com> wrote:
>> > I have an Ultra 10 running Solaris 8 controlling a mass spectrometer
>> > via an ethernet connection.
>> > We can also connect to the Ultra via ssh to download files and do
>> > whatever.
>>
>> > Lately it seems, when people are downloading files the connection to
>> > the mass spec gets stomped
>> > and the program that handles communication between the Ultra and the
>> > mass spec dies or stalls.
>> > I'm told it doesn't happen all the time, but fairly often.
>>
>> > The Ultra 10, the mass spec, a printer and a PC all connect to a hub
>> > (an Inmac Microhub 4
>> > 4x10BaseT + AUI hub). Further, there's a connection between the hub
>>
>> ha, wow. an inmac. How old is this thing?
>>
>> I'd suggest replacing hubs or checking cables before tossing in new nics,
>> especially considering that 10Mb networks aren't going to tax an ultra10
>> in the first place.
>
> We've had the mass spec for about seven years. It was also the mfg's
> proto
> so the instrument itself is probably around ten or more years old. If
> that hub
> was with the instrument the whole time I wouldn't be a bit surprised.
>
> And tell me, when was the last time you saw an AUI connector on
> anything?

With a few days actually, on an Ascent ISDN terminal adapter, It was still
"new" enough to have a RJ45 jack as well.

In my box of legacy nonsense, I have an IBM branded AUI to 10base-2
transciever.

It's almost as silly as those older NICs that actually had 10base2,
twister pair AND an AUI port.

On Apr 3, 9:48 am, "Richard B. Gilbert" <rgilber...@comcast.net>
wrote:
> Cydrome Leader wrote:
> > Eric <einazaki...@yahoo.com> wrote:
>
> >>On Apr 2, 8:39 am, Cydrome Leader <prese...@MUNGEpanix.com> wrote:
>
> >>>Eric <einazaki...@yahoo.com> wrote:
>
> >>>>I have an Ultra 10 running Solaris 8 controlling a mass spectrometer
> >>>>via an ethernet connection.
> >>>>We can also connect to the Ultra via ssh to download files and do
> >>>>whatever.
>
> >>>>Lately it seems, when people are downloading files the connection to
> >>>>the mass spec gets stomped
> >>>>and the program that handles communication between the Ultra and the
> >>>>mass spec dies or stalls.
> >>>>I'm told it doesn't happen all the time, but fairly often.
>
> >>>>The Ultra 10, the mass spec, a printer and a PC all connect to a hub
> >>>>(an Inmac Microhub 4
> >>>>4x10BaseT + AUI hub). Further, there's a connection between the hub
>
> >>>ha, wow. an inmac. How old is this thing?
>
> >>>I'd suggest replacing hubs or checking cables before tossing in new nics,
> >>>especially considering that 10Mb networks aren't going to tax an ultra10
> >>>in the first place.
>
> >>We've had the mass spec for about seven years. It was also the mfg's
> >>proto
> >>so the instrument itself is probably around ten or more years old. If
> >>that hub
> >>was with the instrument the whole time I wouldn't be a bit surprised.
>
> >>And tell me, when was the last time you saw an AUI connector on
> >>anything?
>
> > With a few days actually, on an Ascent ISDN terminal adapter, It was still
> > "new" enough to have a RJ45 jack as well.
>
> > In my box of legacy nonsense, I have an IBM branded AUI to 10base-2
> > transciever.
>
> > It's almost as silly as those older NICs that actually had 10base2,
> > twister pair AND an AUI port.
>
> I think I might have one those too. DE400-???

You know those things really are all over the place if you stop to
look.
I have '90s vintage Personal Iris (in another lab, still working) w/
an
AUI (it goes through an AUI to UTP transceiver). Also that single
board computer in the mass spec I come to find out uses an AUI
(it too gets turned into UTP). Until a few years ago we had a DEC
DELNI that was gathering dust.

Cydrome Leader <presence@MUNGEpanix.com> writes:
>It's almost as silly as those older NICs that actually had 10base2,
>twister pair AND an AUI port.

Why is that silly?

At the time they were made, AUI drops off the 10-base-5 were a valid
form of ethernet still in use in many enterprise shops?

10-base-5 was a touch more stable than many 10-base-2 installations.

Granted, once 1X came o , most places couldn't rip it out
quick enough, but there were still some holdouts for quite some time..