Re: Fwd: Bug 800181: NFSv4 on RHEL 6.3 over six times slower than 5.8

[Rob Kampen <rkampen@xxxxxxxxxxxxxxxxxxxx>]

On 07/19/2012 06:31 AM, Lamar Owen wrote:
> On Tuesday, July 17, 2012 12:28:00 PM Les Mikesell wrote:
> > But the thing with the spinning disks is the thing that will go down.
> > Not much reason for a network to break - at least since people stopped
> > using thin coax.
> Just a few days ago I watched a facility's switched network go basically 'down' due to a jabbering NIC.  A power cycle of the workstation in question fixed the issue.  The network was a small one, using good midrange vendor 'C' switches.  All VLANs on all switches got flooded; the congestion was so bad that only one out of every ten pings would get a reply, from any station to any other station, except on the switches more than one switch away from the jabbering workstation.
>
> Jabbering, of course, being a technical term..... :-)
>
> While managed switches with a dedicated management VLAN are good, when the traffic in question overwhelms the control plane things get unmanaged really quickly.  COPP isn't available on these particular switches, unfortunately.
Just two weeks ago I had a similar issue with a broadband modem 
repeatedly restarting itself - it flooded our network and all our VPNs 
with "jabbering" (TM) and basically left us in an unworkable situation 
until we got someone on site.
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