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Learn about the simple filesystems ramfs and rootfs, and the initramfs archive that contains the initial program to boot the kernel. Compare and contrast ramfs with ramdisk and tmpfs, and how to switch root devices with switch_root.
Ramfs is a simple filesystem that uses Linux's disk caching mechanisms as backing store. It is not an optional component, but a derivative of ramfs called tmpfs adds size limits and swap space.
tmpfs vs. ramfs. The two main RAM based file system types in Linux are tmpfs and ramfs. ramfs is the older file system type and is largely replaced in most scenarios by tmpfs. ramfs. ramfs creates an in memory file system which uses the same mechanism and storage space as Linux file system cache.
Learn how to mount ramfs and tmpfs, two types of RAM-based file systems, to speed up I/O performance in Linux. Compare the differences, advantages, and limitations of ramfs and tmpfs, and see how to configure them with examples.
"ramfs" is a filesystem that exports the Linux caching mechanism (page cache/dentry cache) as a dynamically resizable RAM based filesystem.
Learn how to use RAMFS and TMPFS to allocate part of the physical memory as a fast file system. See the differences, advantages and disadvantages of these file systems and how to mount them on Linux.
Ramfs, rootfs and initramfs. What is ramfs? ramfs and ramdisk: ramfs and tmpfs: What is rootfs? What is initramfs? Populating initramfs: External initramfs images: Contents of initramfs: Why cpio rather than tar? Future directions: relay interface (formerly relayfs) Semantics; klog and relay-apps example code; The relay interface user space API
RAM disk (ramfs) is a temporary file storage facility on many Unix / Linux operating systems. It is intended to appear as a mounted file system, but stored in volatile memory instead of a persistent storage device. RAM drive appears as a virtual disk drive and hosts a disk file system. It is most often used when you require extremely fast IO speed.
"ramfs" is a filesystem driver. To utilize it, you use "mount" command, just specify filesystem type (ramfs) and target directory; device is not required (e.g. "none" can be used): mount -t ramfs none /path/to/location. Regarding usage, the major difference between two is that "ramfs" reuses existing kernel caching mechanisms to store its data.
Mounting ramfs is nearly identical syntax, except we specify -t ramfs instead of tmpfs. We can optionally add a size like tmpfs, but it is not enforced. sudo mount -t ramfs -o size=5g ramfs /mnt/ramdisk. This mounts a 5GB ramfs ramdisk, but it can exceed that size. 3. Use Ramdisk. Usage of the ramfs ramdisk is exactly the same as with tmpfs: