Linux Storage

Jun 21, 2023

• An introduction to the Linux /etc/fstab file | Enable Sysadmin
  A configuration table designed to ease the burden of mounting and unmounting file systems to a machine.

• Block file(b)
• Character device file(c)
• Named pipe file or just a pipe file(p)
• Symbolic link file(l)
• Socket file(s)

• Block layer provides an interface between the file system and the physical storage device, allowing the file system to read and write data to the device
• Block devices are usually implemented with a File System meant for storing files. Now whenever an userspace application initiates a File O operation (read, write), the kernel in turn initiates a sequence of Block I/O operation through File System Manager. The struct bio keeps track of all Block I/O transactions (initiated by user app) that is to be processed. That’s what is mentioned here as flight/active regions.
• Memory buffers are required by the kernel to hold data to/from Block device.
• The block I/O layer also provides functions that allow the kernel to put data buffers in high memory and implement a “zero-copy” schema, where disk data is directly put in the User Mode address space without being copied to kernel memory first
• BIO.pdf

• SPDK
• Linux