SAP HANA High Availability - SAP HANA

What is SAP HANA High Availability?

SAP HANA gives the mechanism for enterprise continuity and disaster restoration for system faults and software errors. high availability in HANA device defines set of practices that enable to obtain business continuity in case of a disaster like power failures in statistics facilities, herbal failures like a hearth, flood, etc. or any hardware failures.

SAP HANA high availability offers fault tolerance and capability of the system to renew system operations after an outage with the minimal business loss.

The following example indicates the stages of excessive availability in HANA device −

The first phase is being prepared for the fault. A fault can be detected automatically or by an administrative movement. Facts are backed up and stand via systems take over the operations. A healing process is put in action consists of restore of a faulty system and original device to be restored to the previous configuration.

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To achieve high availability in HANA system, the key is the inclusion of extra components, which are not important to feature and use in case of failure of other components. It includes hardware redundancy, community redundancy and information center redundancy. SAP HANA offers numerous tiers of hardware and software program redundancies as underneath −

HANA system hardware Redundancy

SAP HANA appliance vendors provide more than one layers of redundant hardware, software and network components, including redundant power substances and fanatics, error-correcting memories, completely redundant network switches and routers, and uninterrupted power supply (UPS). Disk storage system ensures writing even within the presence of electricity failure and use striping and mirroring features to offer redundancy for automatic recovery from disk failures.

SAP HANA software Redundancy

SAP HANA is based totally on SUSE Linux Enterprise 11 for SAP and includes security pre-configurations.

SAP HANA system software includes a watchdog function, which automatically restarts configured services (index server, call server, and so forth), in the case of detected stoppage (killed or crashed).

SAP HANA persistence Redundancy

SAP HANA provides persistence of transaction logs, savepoints and snapshots to support system restart and recovery from failures, with minimal delay and without loss of facts.

HANA system Standby and Failover

SAP HANA device entails separate standby hosts which might be used for failover, in the case of failure of the primary device. This improves the availability of HANA system by using lowering the healing time from an outage.

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