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Recall from the section “Understanding POSIX Permissions with AFP Share Points” that the operating system assigns to new files read and write permissions for the owner, but read only for the group and

Probably disable oplocks and enable strict locking.ĭefault Permissions for New Files and Folders However, if you share a share point via SMB and any other file-sharing protocol, then to prevent data corruption, you should What does this mean for you? If your server shares a share point via the SMB protocol only, and you have “well-behaved” SMBĬlients (which check for file locks appropriately), then for better SMB performance, you may want to enable oplocks and disable To check for an existing file lock with every read and write request. Two SMB clients can simultaneously edit different portions of the same file, which is a nice feature for certain environmentsĪnd workflows, but could cause data loss if any other file-sharing protocol is involved.

Strict locking requires the SMB client to request a lock for an entire file, as opposed to only a portion of the file.

The SMB service does not let another client haveĪccess to the file until the first client has finished writing. If another SMB client requests access to the file, the SMB service notifies the holder of the oplock,Īnd that client should write changes from its cache back to the SMB service. This saves network bandwidth and increases performanceįor the SMB client. Write operations on the cached file rather than directly on the server.

If SMB service supports oplocks, the client can request to cache a file locally, in order to perform read and

Oplocks are opportunistic locks, a client-side performance enhancement that requires cooperation between a Windows client and the.

In order to makeĪn appropriate decision, you need to understand the significance of oplocks and strict locking: The choices you make for file lockingĭepend on what kinds of file-sharing clients you have, and which protocols you use to your share points. File locking prevents multiple clients from writing changes to a file simultaneously.