[one-users] Error "Stale NFS file handle"

[Carlos Jiménez]

Hello everybody,

I have 4 physical computers: 1 as a FrontEnd with CentOS 6.2 and 
OpenNebula 3.6, two hosts with CentOS 6.2 and qemu-kvm and another as an 
nfs server with a debian based distro.
Each time I try to create a new VM, it waits for a long time in PROLOG 
status and then it fails. According to the log, it seems to be a problem 
connected to NFS.
In the NFS server side there are no relevant information in the logs, 
just a few entries like this:
Aug 29 14:56:37 localhost kernel: svc: unknown version (4)
Aug 29 14:56:37 localhost rpc.mountd: authenticated mount request from 
host2:751 for /opt/virtual/one (/opt/virtual/one)


This is the output of the VM log:

Wed Aug 29 14:58:28 2012 [DiM][I]: New VM state is ACTIVE.
Wed Aug 29 14:58:29 2012 [LCM][I]: New VM state is PROLOG.
Wed Aug 29 14:58:29 2012 [VM][I]: Virtual Machine has no context
Wed Aug 29 15:01:12 2012 [TM][I]: Command execution fail: 
/var/lib/one/remotes/tm/shared/clone 
frontend:/var/lib/one/datastores/1/5c0455eb494fd43b5c7c576e0c642fbe 
Host2:/var/lib/one//datastores/0/32/disk.0 32 1
Wed Aug 29 15:01:12 2012 [TM][I]: clone: Cloning 
../../1/5c0455eb494fd43b5c7c576e0c642fbe in 
Host2:/var/lib/one//datastores/0/32/disk.0
Wed Aug 29 15:01:12 2012 [TM][E]: clone: Command "cd 
/var/lib/one/datastores/0/32; cp -r 
../../1/5c0455eb494fd43b5c7c576e0c642fbe 
/var/lib/one/datastores/0/32/disk.0" failed: cp: reading 
`../../1/5c0455eb494fd43b5c7c576e0c642fbe': Stale NFS file handle
Wed Aug 29 15:01:12 2012 [TM][E]: Error copying 
frontend:/var/lib/one/datastores/1/5c0455eb494fd43b5c7c576e0c642fbe to 
Host2:/var/lib/one//datastores/0/32/disk.0
Wed Aug 29 15:01:12 2012 [TM][I]: ExitCode: 1
Wed Aug 29 15:01:12 2012 [TM][E]: Error executing image transfer script: 
Error copying 
frontend:/var/lib/one/datastores/1/5c0455eb494fd43b5c7c576e0c642fbe to 
Host2:/var/lib/one//datastores/0/32/disk.0
Wed Aug 29 15:01:12 2012 [DiM][I]: New VM state is FAILED


I've checked that path and filenames, and both are correct. The file 
itself is a 300MG sized and the error appears in this case just a few 
minutes later but in other cases aprox. 30 minutes after the start of 
the copy, so it doesn't finish the file copy.
At first I managed to solve it unmounting and remounting the shared 
directory and it was possible to fully copy the file (after aprox. 30 
minutes) and run the VM. But today, the problem persists after doing it 
(even after rebooting the clients).
Additionally, I've tried doing the same operation (to copy the same file 
from a directory to another) locally in the NFS Server and it takes just 
a minute (aprox.) to accomplish it.

May it be related to OpenNebula? Could you give me advice on 
troubleshooting it?


Thanks in advance.

Carlos.
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