RAID

RAID combines several physical drives into a logical volume with defined guarantees. The main levels for hosting: RAID 1 (mirror, every write goes to two drives — if one fails the system keeps running), RAID 5/6 (stripe + 1 or 2 parity drives for efficient capacity protection on small clusters), RAID 10 (stripe of mirrors, combines high write performance with redundancy — the standard for database servers). RAID protects against hardware failure, not against software bugs, ransomware or accidental deletion — backups remain mandatory. In a VPS context the RAID runs transparently on the host — you only see a single virtual block device.