> I was trying to run iozone in cluster mode, and faced the same issue you
> I found the solution. My cluster has two network interfaces, one for admin,
> one to connect to the NFS share. I wanted to use jumbo frames to have
> better network performance, so I enabled jumbo frames, MTU size was changed
> on both interfaces to 9000. iozone uses the admin network to connect the
> master and the clients.
> After I changed the MTU size back to 1500 on the admin interface, voila,
> iozone worked. For some reason, when the client is trying to get back to
> the master, it does not like jumbo frames.
I have checked the MTU of the net interface, and it's 1500. I didn't
change the default value:
# ifconfig | grep MTU
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1