Simple definition
Disk space used as an extension of the RAM when necessary.
Technical definition
Disk space used as an extension of RAM when needed. In a professional environment, this mechanism usually integrates with other services to temporarily absorb pressure memory or allow certain system functions.
What is it used for?
temporarily absorb a memory pressure or allow certain system functions.
Practical example
a server uses swap when the available RAM becomes insufficient.
Common issues
- service systemd failure
- incorrect rights or configuration
- disk space, inode or addiction unavailable
Key takeaway: Always adapt the diagnosis to the product version and the architecture actually deployed.