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https://en.wikipedia.org/wiki/Virtual_file_system
A virtual file system (VFS) or virtual filesystem switch is an abstract layer on top of a more concrete file system.The purpose of a VFS is to allow client applications to access different types of concrete file systems in a uniform way. A VFS can, for example, be used to access local and network storage devices transparently without the client application noticing the difference.
https://tldp.org/LDP/tlk/fs/filesystem.html
The Linux Virtual File system is implemented so that access to its files is as fast and efficient as possible. It must also make sure that the files and their data are kept correctly. These two requirements can be at odds with each other. The Linux VFS caches information in memory from each file system as it is mounted and used.
https://docs.microsoft.com/en-us/azure/virtual-machines/linux/disk-encryption-overview
Virtual machine Minimum memory requirement; ... For instance, a 16 GB of root file system usage requires at least 32GB of RAM: Once the OS disk encryption process is complete on Linux virtual machines, the VM can be configured to run with less memory.
https://en.wikipedia.org/wiki/Virtual_memory
In computing, virtual memory (also virtual storage) is a memory management technique that provides an "idealized abstraction of the storage resources that are actually available on a given machine" which "creates the illusion to users of a very large (main) memory".. The computer's operating system, using a combination of hardware and software, maps memory addresses used by a program, called ...
https://www.cyberciti.biz/faq/howto-create-linux-ram-disk-filesystem/
Mar 05, 2010 · Long answer – once memory has been allocated to the ramdisk, it can not be freed until you reboot the system. It will get flagged so that the Linux kernel will not try to reuse the memory again. Therefore, you cannot reclaim the RAM after you are done with using the ramdisk. If you remount the ramdisk, your data will still be there.
https://www.howtogeek.com/howto/33552/htg-explains-which-linux-file-system-should-you-choose/
Jul 10, 2017 · It was a major upgrade from the Minix file system used at the time, but lacks important features. Many Linux distributions no longer support Ext. Ext2 is not a journaling file system. When introduced, it was the first file system to support extended file attributes and 2 terabyte drives.Author: Justin Garrison
https://support.microsoft.com/en-ca/help/2160852/ram-virtual-memory-pagefile-and-memory-management-in-windows
May 15, 2017 · The translation between the 32-bit virtual memory address that is used by the code that is running in a process and the 36-bit RAM address is handled automatically and transparently by the computer hardware according to translation tables that are maintained by the operating system. Any virtual memory page (32-bit address) can be associated with any physical RAM page (36-bit address).Windows 2000 Advanced Server: 8 GB
https://www.logicmonitor.com/blog/the-right-way-to-monitor-virtual-memory-on-linux/
I’m out of memory!” This is a natural reaction – but wrong. Think of ‘free memory’ in Linux as ‘wasted memory’ (or better ‘memory the operating system has not yet been able to take advantage of’). Almost half the memory on this system is in use: but by the file cache.
http://www.tldp.org/LDP/tlk/mm/memory.html
This demonstrates an interesting byproduct of virtual memory; the pages of virtual memory do not have to be present in physical memory in any particular order. 3.1.1 Demand Paging. As there is much less physical memory than virtual memory the operating system must be careful that it does not use the physical memory inefficiently.
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