![]() ![]() Age-based validation on directories (CIFS)-Directories are associated with a preconfigured age.The Open, Lock, Edit, Unlock, and Close commands are guaranteed to work correctly on the WAAS network. From a coherency standpoint, the combination of validate on file open and flush on file close ensures that well-behaved applications, such as Microsoft Office, operate in session semantics. Flush on CIFS close-In CIFS, the File Close operation forces all write buffers to be flushed to the file server, and the Close request is only granted after all updates have been propagated to the file server.This process also applies when you rename a directory, add a new subdirectory, rename a file, or create a new file in a cached directory. These Edge WAEs then update their cache so the file is consistent across all access points. The Edge WAE then sends the changed sections to the file server, and the file server proactively sends change notifications to the other Edge WAEs in the network. Upon receiving the change notification, each Edge WAE checks its cache and invalidates the directories and files listed in the notification, and then updates its cache with the latest versions.įor example, if a user edits an existing Word document and saves the changes to the Edge WAE cache, the Edge WAE sends a change notification to the file server so it knows that the file has been modified. The file server then sends to all the Edge WAEs a change notification that includes a list of the modified directories and files. When a client makes a change to a directory or file, the Edge WAE sends a change notification to the file server. Proactive cache updating-WAAS software supports the use of change notifications in CIFS environments as a way to keep cached data on the Edge WAEs up-to-date. ![]() If the time stamps are different, the Edge WAE removes the file from its cache and requests a fresh copy from the file server. If the time stamps are identical, the cached copy on the Edge WAE is considered valid and the user is permitted to open the file from the Edge WAE cache. WAAS software validates data by comparing the time stamp of a file in the cache to the time stamp of the file on the file server. ![]() For coherency purposes, WAAS software validates the freshness of the file on every file open, and invalidates the cached file if a new version exists on the file server.
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