No one wants to be redundant in conversation, but everyone wants a redundant network. Redundancy allows your system to keep operating smoothly even if something goes wrong. By creating additional instances – through active-active or active-passive networking mechanisms – you can make your network more solid and less prone to being knocked offline due to failure. Redundancy of HLR, case: two HLRs, both are active. Every HLR uses half capacity for its own data and a half for backup of the second HLR.