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

[Dan]

Hi Oleg,

I'm working on getting the sysrq-t output but since the system is in a secure area it can't be had on digital media.  I can retype the parts you need assuming you can tell me!  I guess that could be difficult to specify!  Otherwise I can fax the output to you.

Suggestions?

Thank you!

Dan


-----Original Message-----
From: Oleg Drokin <Oleg.Drokin at Sun.COM>
Date: Tuesday, Nov 27, 2007 10:14 am
Subject: Re: [Lustre-discuss] Exporting Lustre volume via NFS hangs NFS daemons
To: Dan <dan at nerp.net>
CC: Lustre-discuss <lustre-discuss at clusterfs.com>

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