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The CAVA configuration in OneFS supports scanning files in CloudPools. By default, scanning of CloudPools files is disabled to prevent the unexpected cost of file callback. To enable this setting, go to the scan zones settings in the CAVA configuration tab. Figure 16 shows the details.
OneFS has a separate, configurable scan timeout for CloudPools files, because scanning a CloudPools stub file may take more time than a regular on cluster file. To configure the timeout value for scanning CloudPools files, go to the settings section under the CAVA configuration tab. See Figure 17 for details.
When the stub file is read in the kernel level, CloudPools fetches the file content and stores the data in the BCM cache. Because the anti-virus application is the first SMB client to read from the file, it triggers the file-block fetches.
For the scheduled scan, OneFS bypasses the BCM cache because it would continuously overflow the BCM cache, making it worthless. For the on-demand scan or manual scan, the BCM cache would not overflow as often, and the subsequent SMB client read would result in a cache hit.