[CentOS] Fwd: Bug 800181: NFSv4 on RHEL 6.3 over six times slower than 5.8

[Les Mikesell]

On Wed, Jul 18, 2012 at 1:31 PM, Lamar Owen <lowen at pari.edu> 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.

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?

-- 
   Les Mikesell
     lesmikesell at gmail.com