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Guidelines for disabling the CIFS oplocks setting
Usually, you should leave CIFS oplocks (opportunistic locks) enabled for all FlexVol volumes and qtrees. This is the default setting. However, you might turn CIFS oplocks off under certain circumstances.
CIFS oplocks enable the redirector on a CIFS client in certain file-sharing scenarios to perform client-side caching of read-ahead, write-behind, and lock information. A client can then work with a file (read or write it) without regularly reminding the server that it needs access to the file. This improves performance by reducing network traffic.
You might disable CIFS oplocks on a volume or a qtree under either of the following circumstances:
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You are using a database application whose documentation recommends that CIFS oplocks be turned off.
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You are handling critical data and cannot afford even the slightest data loss.
Otherwise, you can leave CIFS oplocks enabled.
For more information about CIFS oplocks, see the CIFS section of the Data ONTAP Cluster-Mode File Access and Protocols Management Guide.
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