How do I disable opportunist locking?

John Savill

April 22, 2001

1 Min Read
ITPro Today logo in a gray background | ITPro Today

A. Windows XP and Windows 2000 support opportunist locking, which lets Sever Message Block (SMB) clients lock a file on the server and cache the information, without having to worry whether another user might change the file (earlier Windows versions also support this feature, but the method is different). Opportunist locking leads to better performance for the user. However, it adds a workload to the server, which must maintain and manage the locks. You can use one of two methods to disable opportunist locking.

Method 1

  1. Start regedit.exe.

  2. Go to HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesMRxSmbParameters.

  3. From the Edit menu, select New, DWORD value.

  4. Enter a name of OplocksDisabled, and press Enter.

  5. Double-click the new value, and set it to 1.

  6. Click OK.

Method 2

  1. Start regedit.exe.

  2. Go to HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServiceslanmanserverparameters.

  3. From the Edit menu, select New, DWORD value.

  4. Enter a name of EnableOplocks and press Enter.

  5. Double-click the new value, and set it to 0.

  6. Click OK.

In addition, under the HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServiceslanmanserverparameters, you can set the following optional parameters to tune opportunist locking:

  • MinLinkThroughput (DWORD)—The minimum number of bytes per second that must be maintained through the server before the lock is disabled (0 to infinite)

  • MaxLinkDelay (DWORD)—The maximum time allowed for a delay in the link before the lock is disabled (0 to 100,000 seconds)

  • OplockBreakWait (DWORD)—The time the server waits for a client holding a lock to respond to a lock break request before forcefully breaking the lock (10 to 180 seconds)

About the Author

John Savill

John Savill

https://savilltech.net

See more from John Savill
Sign up for the ITPro Today newsletter
Stay on top of the IT universe with commentary, news analysis, how-to's, and tips delivered to your inbox daily.
Newsletter Sign-Up

You May Also Like

Editor's Choice

a stressed employee at their laptop and collaboration icons gone amok
Unified Communications
Microsoft Teams Is Acting Up. What Can We Do?Microsoft Teams Is Acting Up. What Can We Do?
byBrien Posey
Sep 12, 2024
4 Min Read
person placing a block between two columns of blocks
IT Management
Data Skills Gap Is Hampering Productivity; Is Upskilling the Answer?Data Skills Gap Is Hampering Productivity; Is Upskilling the Answer?
byNathan Eddy
Sep 7, 2024
7 Min Read
data privacy quiz sample question above a desk
Data Privacy
Data Privacy Quiz: 20 Questions To Test Your KnowledgeData Privacy Quiz: 20 Questions To Test Your Knowledge
byIan Horowitz
Aug 30, 2024
1 Min Read
Exclusive ITPro Resources
See all ITPro Resources

Featured How Tos

tablet with "cloud computing" on the screen on top of financial documents and calculator
Cloud Computing
Guide to Cloud Computing ETFsGuide to Cloud Computing ETFs
A cartoon of a person sitting at a computer, with speech bubbles—one from the person saying Hello and one from the computer responding with Hello
PowerShell
PowerShell Speech Recognition: How To Set up Voice Commands and ResponsesPowerShell Speech Recognition: Set up Voice Commands and Responses
Migrating From VMware Guide cover
VMWare
Migrating From VMware: Guide to a Successful TransitionMigrating From VMware: Guide to a Successful Transition
Sign up for the ITPro Today newsletter
Stay on top of the IT universe with commentary, news analysis, how-to's, and tips delivered to your inbox daily.
Newsletter Sign-Up
Trending

Recent What Is

list of domains within the umbrella category of IT security
IT Security
What Is IT Security? Essentials of IT Security ExplainedWhat Is IT Security? Essentials of IT Security Explained
ITPro Today's tech careers quick reference guide cover
Career Management
Tech Careers: Quick Reference Guide to IT Job TitlesTech Careers: Quick Reference Guide to IT Job Titles