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One of the differences between Auri Stor FS and earlier AFS variants is the use of secure callback channels.Once the cache manager obtains the latest metadata it can compare the current data version number to the version of the data that was cached.Visit Stack Exchange The *data version number" for an object is incremented each time the object's data is modified but not when the metadata changes.The client, aka the cache manager, is permitted to cache data and metadata for an object but is only permitted to consider it up to date if it has obtained a *callback promise" from a file server.Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.Visit Stack Exchange Windows just recently decided that it was no longer genuine and it keeps telling me that I need to re-activate.It checks/verifies lots of "background/internal" settings and then clears the error state (assuming the problem was resolved)... Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site (the association bonus does not count).
There is a fundamental requirement that if machine A is actively using a file and machine B wants to modify the file and then send an out of band message to machine A to read the updated file that the file update must arrive before the out of band message.
If the version has not changed, then the cached data is still valid.
Otherwise, the out of date data must be discarded from the cache and the updated data fetched.
I hope this satisfactorily describes the behavior for the AFS family of file systems.
This topic has started to come up again as we go through PA-DSS research on applications and find that the listings contain operating systems that are at or past end of life (EOL).