Failíochta ard (HA) a chiallaíonn dearadh córas a fhanann oibríochtúil in ainneoin theipeanna — trí iomarchuibhiú, fhíorú i gcealla-AZ iolracha, aisghnóthú-dhíreach, agus deireadh a chur ar phointí neamhtheirmdinnithe. Is sprioc bhunúsach é do chórais tháirgthe agus is príomhréimse é d'ailtireacht AWS.
Prionsabail bhunúsacha HA
✓ ELIMINATE SINGLE POINTS OF FAILURE — no single component whose failure takes down
the system → redundancy everywhere (multiple instances, AZs, etc.)
✓ Deploy across MULTIPLE AVAILABILITY ZONES — survive an AZ (data center) failure
✓ AUTOMATIC RECOVERY — detect failures and recover/replace automatically (no manual fix)
✓ DECOUPLE components — failures isolated; one component's failure doesn't cascade
