Ram file types

As the data is lost when the machine reboots the data must not be precious as even scheduling backups cannot guarantee that all the data will be replicated in the even of a system crash. The two main RAM based file system types in Linux are tmpfs and ramfs. Running the command free in Linux will show you the amount of RAM you have on your system, including the amount of file system cache in use. The below is an example of a 31GB of ram in a production server.

Currently 8GB of file system cache is in use on the system. This memory is generally used by Linux to cache recently accessed files so that the next time they are requested then can be fetched from RAM very quickly.

This is a problem if the application writing to the file system cannot be limited in total size. Another issue is you cannot see the size of the file system in df and it can only be estimated by looking at the cached entry in free. This behaviour is exactly the same as a partition of a physical disk.

The size and used amount of space on a tmpfs partition is also displayed in df. These two differences between ramfs and tmpfs make tmpfs much more manageable however this is one major drawback; tmpfs may use SWAP space. If your system runs out of physical RAM, files in your tmpfs partitions may be written to disk based SWAP partitions and will have to be read from disk when the file is next accessed.

Thanks for the shared information! Remember, different programs may use RAM files for different purposes, so you may need to try out a few of them to be able to open your specific file. Not sure exactly what type of file you are trying to open? Try our new File Analyzer.

It is a free tool that can identify more than 11, different kinds of files - most likely yours too! It will help you find software that can handle your specific type of file.

Download File Analyzer here. Update info Upload example file. Various viewers for this file format These apps are known to open certain types of RAM files. We have not verified any software that we know for certain will work with RAM-files on Mac.

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