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-   -   Fwd: Bug 800181: NFSv4 on RHEL 6.3 over six times slower than 5.8 (http://www.linux-archive.org/centos/684950-fwd-bug-800181-nfsv4-rhel-6-3-over-six-times-slower-than-5-8-a.html)

Lamar Owen 07-18-2012 06:31 PM

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

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Lamar Owen 07-19-2012 05:06 PM

Fwd: Bug 800181: NFSv4 on RHEL 6.3 over six times slower than 5.8
 
On Wednesday, July 18, 2012 03:31:53 PM Les Mikesell wrote:
> Sure, everything can break and most will sometime, but does this
> happen often enough that you'd want to slow down all of your network
> disk writes by an order of magnitude on the odd chance that some app
> really cares about a random write that it didn't bother to fsync?

For some applications, yes, that is exactly what I would want to do. It depends upon whether performance is more or less important than reliability.
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