In this mount mode, the Linux operating system operates in a write-back mode rather than a write-through. When a write operation occurs, it is promptly acknowledged by the Content Software for File client and temporarily stored in the kernel memory cache. The actual persistence of this data in resilient storage happens as a background operation at a later time.
This mode enhances performance, especially in reducing write latency, while ensuring data coherency. For instance, if a file is accessed through another server, the local cache is invalidated, and the data is synchronized to maintain a consistent view of the file.
To synchronize the filesystem and commit all changes in the write cache—useful, for example, when ensuring synchronization before taking a snapshot—you can employ the following system calls: sync, syncfs, and fsync.