[Lustre-discuss] Exporting Lustre volume via NFS hangs NFS daemons

[Oleg Drokin]

Hello!

On Nov 27, 2007, at 1:00 PM, Dan wrote:
> I'm running Lustre 1.6.3 on a 64 bit RHEL 4 update 5.  I've exported  
> the Lustre volume via NFS to 20 32 bit RHEL 3 update 6 clients.  I  
> can mount, create files and write to them at first but the NFS  
> daemons all go into an I/O wait state and never return.  Since they  
> cannot be killed the only solution is rebooting.  Increasing the  
> number of daemons allows it to run longer before all available are  
> hung up.  I get no errors to console or logs maybe I'm not looking  
> in the right place?  Trying to unmount the NFS export results in  
> infinite wait unless I use lazy umount.
>
> This is similar to bug #13030 but that was landed for 1.6.3 which  
> I'm running.  How do I make this work?  Suggestions?  Thanks,

Can you please issue sysrq-t when this happens and provide us with  
traces of hung nfs daemons?

Bye,
    Oleg