Re: [CentOS] System Hang on busy NFS server

[John Doe]

From: James A. Peltier 

> On a busy NFS server I've started receiving the following error messages and 
> the system hangs with high load but no work being done.  The system is a Dell 
> R510 with 12 x 3TB drives in a RAID-50 configuration.  The RAID-50 device is 
> a 
> full disk LVM (no partitions) and one large (36TB) data volume and the system 
> is 
> running CentOS 6.4 fully patched for OS and firmware.
> 
> Anyone have any hints as to what might be causing this.  It looks to me like 
> the 
> system is starting to swap and then failing and then XFS starts to throw a 
> hissy 
> fit because it can't start allocating pages for it's buffers.  
> Eventually then the system just deadlocks.  I'm just looking for someone to 
> confirm my findings and let me know if this is a bug or not.
> 
> I've posted the dmesg output onto pastebin http://pastebin.com/YQbhsN6a
> 
> Any help is very much appreciated!

Google seems to suggest to maybe perhaps look at:
  sysctl vm.min_free_kbytes

JD
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[CentOS] System Hang on busy NFS server

[James A. Peltier]

On a busy NFS server I've started receiving the following error messages and 
the system hangs with high load but no work being done.  The system is a Dell 
R510 with 12 x 3TB drives in a RAID-50 configuration.  The RAID-50 device is a 
full disk LVM (no partitions) and one large (36TB) data volume and the system 
is running CentOS 6.4 fully patched for OS and firmware.

Anyone have any hints as to what might be causing this.  It looks to me like 
the system is starting to swap and then failing and then XFS starts to throw a 
hissy fit because it can't start allocating pages for it's buffers.  Eventually 
then the system just deadlocks.  I'm just looking for someone to confirm my 
findings and let me know if this is a bug or not.

I've posted the dmesg output onto pastebin http://pastebin.com/YQbhsN6a

Any help is very much appreciated!

-- 
James A. Peltier
Manager, IT Services - Research Computing Group
Simon Fraser University - Burnaby Campus
Phone   : 778-782-6573
Fax : 778-782-3045
E-Mail  : jpelt...@sfu.ca
Website : http://www.sfu.ca/itservices

“A successful person is one who can lay a solid foundation from the bricks 
others have thrown at them.” -David Brinkley via Luke Shaw
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