19 definitions associated with Availability.
19 matching terms
Page 1 of 1An architecture in which multiple service nodes actively answer traffic at the same time. In DDI, the term can describe anycast DNS, load-balanced DHCP, or multi-primary management, but the exact behavior depends on the product.
Read definitionAn architecture in which one node serves traffic while a standby node waits to take over after a failure. State synchronization and failover detection determine how much disruption or data loss can occur.
Read definitionA mechanism used to determine that a partner, server, or network path is no longer functioning. DDI products may use heartbeats, protocol messages, routing state, or interface status to trigger failover.
Read definitionA protocol or product feature that allows two DHCP servers to coordinate lease ownership and continue service after a partner failure. DHCPv4 failover behavior and DHCPv6 failover use different standards and implementations.
Read definitionThe controlled return of service from a backup or surviving node to the preferred normal topology after a failure is resolved. Failback should account for state synchronization, traffic convergence, and client caching.
Read definitionThe transfer or continuation of service when a component, site, process, or network path fails. DDI failover can rely on HA clustering, DHCP state sharing, anycast routing, secondary zones, or managed-service distribution.
Read definitionGrid Master Candidate, an Infoblox member configured to take over the Grid Master role if the active Grid Master fails. It should be sized, licensed, synchronized, and operationally tested for takeover.
Read definitionTwo nodes configured as a high-availability unit, normally presenting a shared service identity and synchronizing state. Infoblox NIOS HA pairs use active and passive nodes with HA communication and service VIP behavior.
Read definitionA periodic signal used to show that a node, peer, or service is alive and communicating. Missing heartbeats can trigger alarms, state changes, or failover.
Read definitionA design objective and set of mechanisms that reduce service interruption when components fail. HA can include redundant nodes, state replication, anycast, routing convergence, secondary zones, and tested recovery procedures.
Read definitionA waiting period during which a resource, route, lease, or state transition is not immediately reused or reversed. Hold-downs reduce flapping and allow stale information to age out.
Read definitionA DHCP failover mode in which one server normally owns most or all active service while the partner is ready to take over. It is often chosen when servers are in separate sites or one is intended mainly for disaster recovery.
Read definitionA failover mode or traffic design in which multiple servers actively handle clients according to a hash, split, relay selection, or load balancer. For DHCP, shared lease state and consistent client handling are critical.
Read definitionA DHCP failover safety interval limiting how far one partner can extend a lease beyond information known to the other. It reduces the chance of duplicate allocation after communication or partner failure.
Read definitionA failover state in which one server is administratively or automatically authorized to assume broader responsibility because its peer is considered unavailable. Entering the state incorrectly can create duplicate allocation risk.
Read definitionThe minimum set of nodes or votes required to make authoritative cluster decisions. Quorum prevents split-brain writes but may sacrifice management availability when too many members are unreachable.
Read definitionDuplication of components, paths, data, or services so a single failure does not cause total outage. Redundancy only improves availability when failure modes are independent and recovery is tested.
Read definitionA failure in which peer nodes lose communication and both act as the active authority, potentially creating conflicting leases or configuration. Quorum, fencing, MCLT, and operational procedures reduce the risk.
Read definitionVirtual Router Redundancy Protocol, which lets routers or appliances share a virtual IPv4 or IPv6 address and elect an active master. Some HA DDI systems use VRRP-like service VIP behavior.
Read definition