Re: Iozone on multiple nodes using ssh

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Re: Iozone on multiple nodes using ssh

Chuanwen Wu
Hi, Jairo, thanks!

On Thu, Feb 5, 2009 at 3:54 AM,  <[hidden email]> wrote:

> Chuanwen,
>
> I was trying to run iozone in cluster mode, and faced the same issue you
> are.
>
> 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


--
wcw

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