![]() ![]() The SIOS software makes DR testing easy by allowing administrators to move SAP to the DR site for testing and to move it back to the primary site when testing is done. It performs both local recovery or complete failover quickly and easily. When the SIOS software detects a problem, it automatically initiates one of three configurable recovery actions that will maximize uptime and protection for applications and data: it may attempt a restart on the same server switchover to a standby server or alert a system administrator. SIOS clusters can also stop and restart the application both locally and on another cluster server at either the same site or at another geographic location. Real-time replication ensures immediate recovery from a local system failure and allows you to create multiple real-time copies through one-to-many replication. SIOS software lets you configure standby servers that are either local or remote over a LAN or WAN. In the event of a failure on the active server, SIOS software moves SAP operation to the standby server. SIOS software actively monitors: servers, operating systems, SAP Primary Application Server (PAS) Instance, ABAP SAP Central Service (ASCS) Instance, back-end databases (Oracle, DB2, MaxDB, MySQL and PostgreSQL), the SAP Central Services Instance (SCS), volumes or file systems, file shares or NFS mounts, IP and virtual IP, Enqueue and message servers,and Logical Volumes (LVM). SIOS software verifies that SAP is running, file shares or NFS exports are available, databases are mounted and available, and clients are able to connect. Unlike traditional clustering software that only checks that the server is alive, SIOS LifeKeeper software monitors the health of the entire SAP environment and provides application-aware high availability to ensure maximum uptime. Continuous Monitoring of the Entire SAP S4/HANA Environment Replication can operate in either synchronous or asynchronous mode. ![]() ![]() SAN and SANless Clusters You can use SIOS LifeKeeper software to build a traditional SAN-based cluster or build a SIOS SANless cluster by synchronizing local storage on the active SAP Server with local storage on a standby server using SIOS real time, block-level replication. SIOS software provides easy and flexible configuration, fast replication, and comprehensive monitoring and protection of the entire SAP application environment. SIOS software lets you protect SAP and HANA in any configuration (or combination) of physical, virtual, cloud (public, private, and hybrid) and high performance flash storage environments. SIOS SAN and SANless clustering software provides comprehensive SAP certified protection for your applications and data, including high availability, data replication, and disaster recovery in an easy, cost-efficient solution. I check my initial SU01 screen and i still have edit option.Īs we have seen, even in the event of a fail-over all the locks will still be held and will not be lost.Solution Brief: High Availability for SAP S4/HANA I perform a fail-over test, notice how the lock table entries changeĪt the point of fail-over the locks are 0, once the stand-alone services are started then the lock table information is got from the replication table. I move to SM12 and check for lock entries I move to SU01 and click on edit, so i get a lock assigned on an object Below is a simple view of a 2-node cluster architecture for ERSīelow is a demonstration of the fail-over - Real-time Scenario Enqueue replication server does exactly this. In order to preserve the locks we need a duplicate table on the other cluster node. In doing so the enqueue table will be flushed. Now why is a enqueue replication server needed? When there is a fail-over of the cluster node, the ASCS & SCS services will fall onto the other cluster node. ![]() For ABAP it will be the ASCS & for Java it will be SCS. Enqueue Replication Server Part 1 - What is ERS When you install a SAP instance in a high availability (HA) configuration, you will be installing the central services instance separately. ![]()
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