[Info-vax] hub better than switch?!

[Jan-Erik Soderholm]

Phillip Helbig---undress to reply wrote 2012-03-04 08:14:
> A while back, I posted a question about a slowly (about 2 per day)
> increasing error count, mostly on PEA0: but occasionally on some disks
> connected to the same machine which shows the errors on PEA0:.  This
> stopped after my old switch died and I replaced it with a hub (actually
> this strange 10/100 Mb/s hybrid thingamajig).  I assumed that whatever
> caused the switch to fail was also responsible for these errors before
> the failure.
>
> Since I replaced this "hub" with a brand new 10/100/1000 MB/s proper
> switch a few days ago, the increasing error count is back.  :-(  It
> occurs on the one machine in the cluster which has a 100 MB/s ethernet
> card (the others have 10).  On the switch, this is running at 100 while
> on the "hub" it ran at 10 (but other things on the hub---an access point
> and another switch---ran at 100).
>

 > about a slowly (about 2 per day) increasing error count,

Does it say anything about *what* error ?

If I understand correctly, you have VMS-Cluster ovar LAN with one node
running at 100 Mb/s and the other node/nodes running at 10 Mb/s ?

What if you, just as a test, force the 100 Mb/s node down to 10 Mb/s ?

I've no idea if it is significant, but it is a simple test that *I*
would perform anyway. :-)

 > while on the "hub" it ran at 10...

So it that case *all* cluster members run at the same speed ?

I'd look closer to the speeds then to any hub/switch diffrences.

Jan-Erik.