Peter,

Way, way back when... I wrote up some notes, and created a REG file, on 
OpLocks. They're at: https://kennedysoftware.ie/oldapps.htm#Reg

Might be worth a quick glance, in case they help in any way. E&OE, 
obviously!

   - Michael


On 17/11/2022 21:11, Peter wrote:
> I ended up doing this on the machine acting as a server, I hope this is 
> right.
> 
> HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters\EnableOplocks
REG_DWORD 0
> 
> Being as the server should now reject all requests for oplocks, do I 
> still need to make an entry on the workstations?
> HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MRXSmb\Parameters\OplocksDisabled
REG_DWORD 1
> 
> Thank you.
> 
> 
> 
> On 11/17/2022 12:30 p.m., Peter wrote:
>> I am trying to make sense of "oplocks". I believe I understand their 
>> purpose and am trying to disable them on the machine that acts as a 
>> server (Win 7) and the other machines (Win Xp & Win 7) that are 
>> accessing the files.
>>
>> The purpose is to try to get the refresh thing to work properly as it 
>> is totally inconsistent at this time -my experiments indicate that 
>> success of refresh is linked to the direction of the wind.
>>
>> Write-caching has been (always was) disabled on all machines.
>>
>> I have scoured these newsgroups and found Liz's response(s) showing 
>> links but the community is n/a. I found one website but am not sure if 
>> the suggestions applies to all machines or, one is 'server' and other 
>> is 'clients'. Do they both apply to XP and 7?
>>
>> It looks like the first suggestion would be for all machines running 
>> Pdox and the second is for the machine acting as a server, but am not 
>> sure.
>>
>> Can someone tell me what registry entries I need to make to disable 
>> oplocks? Please. Thank you.
>>
>>> https://www.betaarchive.com/wiki/index.php?title=Microsoft_KB_Archive/296264
>>
>> HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MRXSmb\Parameters\
>> OplocksDisabled REG_DWORD 0 or 1
>> Default: 0 (not disabled)
>>
>> Note The OplocksDisabled entry configures Windows clients to request 
>> or not to request opportunistic locks on a remote file.
>>
>> You can also deny the granting of opportunistic locks by setting the 
>> following registry entry to 0:
>>
>> HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters
>> EnableOplocks REG_DWORD 0 or 1
>> Default: 1 (enabled)