Unable to copy large files to NFS server

Unable to copy large files to NFS server

[Dan McNulty]

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Hi,

 

We have recently purchased a new EMC NAS solution. I have successfully
configured our newer (Fedora4) servers to access this successfully.

 

However we have a number of RedHat 7.2 servers (kernel 2.4.18), which I
have successfully mounted to the Server, and can copy small files OK.
However, when I try to copy larger files to the Server, the system just
hangs, and then the mount becomes unusable; I'm unable to kill the hung
process and cannot unmount. I have tried to edit the rsize/wsize options
but this hasn't worked. The current entry in /etc/fstab looks like this:

 

Servername:/path1/path2/Production    /mnt/Production nfs
rsize=4096,wsize=4096,nfsvers=3 0 0

 

In /var/log/messages I see lots of these errors:

 

Jul 31 16:29:51 client1 kernel: nfs: server Servername not responding,
still trying

Jul 31 16:31:40 client1 kernel: nfs: task 189 can't get a request slot

Jul 31 16:31:40 client1 kernel: nfs: task 190 can't get a request slot

 

The main problem is that I can write small files and it works OK. As
soon as I try to transfer a larger file, the client writes a 0 byte file
to the server (with the correct filename) then just hangs. I then can't
do anything with the mount. Any help on what I should be looking at
would be much appreciated!

 

Regards,

 

Dan. 
 
--
  
Dan McNulty
Systems Administrator
Eckoh Technologies (UK) Limited
Telford House, Corner Hall,
Hemel Hempstead, Hertfordshire HP3 9HN 
 
T 01442 458390
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Re: Unable to copy large files to NFS server

[Steve Dickson]

Dan McNulty wrote:
> Hi,
> =

>  =

> =

> We have recently purchased a new EMC NAS solution. I have successfully =

> configured our newer (Fedora4) servers to access this successfully.
> =

>  =

> =

> However we have a number of RedHat 7.2 servers (kernel 2.4.18), which I =

> have successfully mounted to the Server, and can copy small files OK. =

> However, when I try to copy larger files to the Server, the system just =

> hangs, and then the mount becomes unusable; I=92m unable to kill the hung =

> process and cannot unmount. I have tried to edit the rsize/wsize options =

> but this hasn=92t worked. The current entry in /etc/fstab looks like this:
> =

>  =

> =

> Servername:/path1/path2/Production    /mnt/Production nfs     =

> rsize=3D4096,wsize=3D4096,nfsvers=3D3 0 0
> =

>  =

> =

> In /var/log/messages I see lots of these errors:
> =

>  =

> =

> Jul 31 16:29:51 client1 kernel: nfs: server Servername not responding, =

> still trying
> =

> Jul 31 16:31:40 client1 kernel: nfs: task 189 can't get a request slot
> =

> Jul 31 16:31:40 client1 kernel: nfs: task 190 can't get a request slot
> =

>  =

> =

> The main problem is that I can write small files and it works OK. As =

> soon as I try to transfer a larger file, the client writes a 0 byte file =

> to the server (with the correct filename) then just hangs. I then can=92t =

> do anything with the mount. Any help on what I should be looking at =

> would be much appreciated!
Are you using UDP or TCP mounts? If udp, switch to TCP.. also,
use 'tethereal -w /tmp/data.pcap host <server>' to capture this
hang to see which side stop sending (meaning is the client waiting
for a reply or is the server waiting for another request).

I know in the past, EMC server had an issue with how FC and RHEL kernels
handled ESTALE messages... but I doubt that is happening in this
case... but you might want to rummage around in both bug database
(assuming you have access to EMC's) and see if this a known issue and
if there is a fix to it..

steved.

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