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Linux Intermediate

What is RAID?

Redundant Array of Independent Disks — a technology combining multiple physical drives into a single unit for performance, redundancy, or both.

RAID configurations protect against disk failures and improve performance. RAID 0 (striping) splits data across disks for speed but no redundancy. RAID 1 (mirroring) duplicates data on two disks for redundancy. RAID 5 uses striping with distributed parity, requiring minimum 3 disks and tolerating one failure. RAID 6 adds double parity for two-disk failure tolerance. RAID 10 combines mirroring and striping for both speed and redundancy. Linux supports software RAID through mdadm. RAID is not a backup replacement — it protects against hardware failure, not data corruption, accidental deletion, or ransomware.

Related Terms

Firewalld
A dynamic firewall management tool for Linux that provides a D-Bus interface for managing firewall rules with zones.
Nohup
A command that runs a process immune to hangup signals, allowing it to continue after the terminal session ends.
Systemd Timer
A systemd unit that triggers services on a schedule or at specific events, serving as a modern alternative to cron jobs.
Journald
The systemd journal daemon that collects and stores log data from services, the kernel, and boot messages in a structured binary format.
Network Namespace
A Linux kernel feature that provides isolated network stacks with independent interfaces, routing tables, and firewall rules.
Bash Script
A text file containing a series of shell commands that are executed sequentially by the Bash interpreter.
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