How to configure file extension scanning for Vscan
Applies to
- ONTAP 9
- Vscan
Description
- Explanation of the behaviour of the scanning process, specifically how inclusion and exclusion lists of file extensions function.
Note: Double extension is supported from ONTAP 9.14.1
- The notation used in configuration examples in Procedure below was chosen for readability only and does not suggest a specific format or syntax to be used
Scanning Rules
- Priority of Exclude List: If a file extension is present in both the include and exclude lists, the exclude list takes priority. This means the file will not be scanned.
- Empty Include List: An empty include list is treated as "*", meaning all file extensions are included by default. In this scenario, if a file extension is not found in the exclude list, the file will be scanned.
- Files Without Extensions: If a file does not have any extension, it will be scanned as the scan-file-with-no-ext field is by default set to true. Set this field to false if scanning of files without extension is not desired.
- Priority of Longer Extensions: Longer extensions take priority over shorter ones. For example, an extension like “mk.out” takes priority over “out” for the file ontap.mk.out
- Priority of Longer Extensions:
- ONTAP Vscan supports filtering of files for scanning based on up to two extensions.
- When dealing with double extensions (example, ontap.mk.out), take precedence over single extensions (example, ontap.out). For instance, if your exclude list contains both single and double extensions (such as ["mk.out", "out"]), the system will first attempt to match files against the double extensions.
- If no match is found, it will then check against the single extensions.
- This prioritization ensures that more specific file types are accurately filtered before considering more general ones.
- Wildcard in Include List: The wildcard * in the include list will have the lowest priority compared to specific file extensions.
