[linux-cifs] cifs oplock windows share

Sorry for reposting precedent mail

I am working in a university.
I have integrated 160 linux Fedora 14 clients in a Active directory with Windows Server 2008 with winbind.
The linux home is local, but the document directory is mounted on a windows share via pam_mount and cifs
The windows share is configured like this in /etc/security/pam_mount.conf.xml
volume user="*" fstype="cifs" server="$SERVEURDONNEES" path="$REPERTOIREDONNES/%(DOMAIN_USER)" mountpoint="~/Documents" options="nounix,noserverino

Everything was working when only a few computers were connected.
Howether, when several linux computers were working, there was the problem :
ct 5 16:42:24 u1209-01l kernel: [ 58.783078] CIFS VFS: No response for cmd 114 mid 1
Oct 5 16:42:24 u1209-01l kernel: [ 58.783094] CIFS VFS: cifs_mount failed w/return code = -112
Oct 5 16:42:24 u1209-01l kdm: :0[1926]: pam_mount(mount.c:64): Errors from underlying mount program:
Oct 5 16:42:24 u1209-01l kdm: :0[1926]: pam_mount(mount.c:68): mount error(112): Host is down
Oct 5 16:42:24 u1209-01l kdm: :0[1926]: pam_mount(mount.c:68): Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)
Oct 5 16:42:24 u1209-01l kdm: :0[1926]: pam_mount(pam_mount.c:521): mount of data/u20 failed

And the windows share went completely out of line: the server must be rebooted ...
I have put 
modprobe cifs
echo 0 > /proc/fs/cifs/OplockEnabled
on the /etc/rc.d/rc.local in all the linux clients and everything was resolved.

Everything is working fine for several months.

Now in another part of the university, I have put the same system on 100 Fedora 14 clients.
The only difference is the Windows Server is 2008 R2 and don't use the same SMB: version 2.1
The problem is back again... The windows share freezes and the windows server R2 must be rebooted.
echo 0 > /proc/fs/cifs/OplockEnabled don't seem to work anymore
I don't understand well how to resolve the problem.
Is this a cifs problem ? Must I downgrade the windows Server to 2008 ?
I have read about to put max protocol = smb2 in smb.conf. What must I investigate for resolving this ?


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