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How to disable Opportunistic Locking on W2K server and XP/sp2 client PC's

Posted on 2007-04-04
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Last Modified: 2012-06-27
I have checked for a method to disable Opportunistic Locking via the registry entries but non seem to apply. I have a Win 2000 PC, and XP/sp2 PC, and W2000 Server sp4. And I have checked all the below registry location and non have a parameter EnableOpLockForceClose, EnableOplocks or OplocksDisabled. What does this indicate? Is it enabled? Is there a way to check if Server/PC's have it enabled?

Data Access source:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters

Microsoft source:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MRXSmb\Parameters
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Question by:pk9pk9
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Expert Comment

by:jkr
ID: 18851934
See http://support.microsoft.com/kb/296264 ("Configuring opportunistic locking in Windows") and take a look at the 'Defaults' for these parameters:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MRXSmb\Parameters\
OplocksDisabled REG_DWORD 0 or 1
Default: 0 (not disabled)

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters
EnableOplocks REG_DWORD 0 or 1
Default: 1 (Enabled by Default)

So if there is ni 'EnableOplocks' entry, it means that they're enabled (as above). To disable them, create an entry as describred in the article and set it to '0'. The same applies to 'OplocksDisabled' just the other way round - no entry means 'enabled'.
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Author Comment

by:pk9pk9
ID: 18852616
jkr,
THanks, I did carefully read that MS KB article you site. It does state that by default it is enabled. But nowhere does it say if the parameter OplocksDiabled is not in the MRXsmb entry that it is ON.
Unless I missed. Is there a way to check if oplock is on or off without checking registry.
Thanks
Peter
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Author Comment

by:pk9pk9
ID: 18881903
Where are the experts?
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LVL 86

Expert Comment

by:jkr
ID: 18917446
>>But nowhere does it say if the parameter OplocksDiabled is not in the MRXsmb
>> entry that it is ON

Um, what in 'not disabled' is unclear?

>>Is there a way to check if oplock is on or off without checking registry

From code: Yes, but AFAIK not from the command line or GUI.
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Author Comment

by:pk9pk9
ID: 18917882
jkr I am not familiar with term AFAIK.
My concern is MS has multiple locations in the registry for turning off Oplocks from LanmanServer, to LanmanWorkstation to MRXSmb based on a given OS (ie XP, W2K, W20003 Server.)
A more importatant question is after I have input all of the above registry changes, is there a way to test and  confirm that oplocks has actually been Disabled.
Thanks jkr
Peter
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Accepted Solution

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jkr earned 500 total points
ID: 18921772
'AFAIK' == "As Far As I Know"

As said, I'd know how to check that in C/C++ code, but really don't know any e.g. control panel applet or such that can give you that kind of info other than looking at the registry.
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Author Comment

by:pk9pk9
ID: 18935727
jkr
Thanks, for AFAIK,
As noted if the only way to check is via registery entry and no other secondary means it is a bad way for MS to design it. THis is especially true given that I assume registry entries that are not understood as valid are just discarded. So my great concern is this can enable ISAM type databases to become corrupt.  Quite lacking in STABILITUS. Thanks jkr, you earned it.

PS This new layout of  Experts-Exchange (small text, slow, duffy graphics) has got to go.
It need to allow users to post coded/images etc to help explain problem
Just my thoughts.
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