![]() This blog will describe how you can tweak the Enqueue Replication 2 High Availability setup, and how you can benefit from of the new feature of Enqueue Replication 2 technology. When all application instances have been restarted, the dormant ERS should be restarted, the SCS cluster failed over and the remaining dormant ERS restarted.How to tweak your SAP S/4 HANA – Enqueue Replication 2 HA Setup When the instance has started successfully, it can be made active by reversing the isolation activities. Once isolated, the instance can be restarted to introduce the new kernel as space will detect the new version in /sapmnt and initiate a copy of the new version into the instance-specific executable directory. direct logon, transport system communication etc. Isolating the instance means preventing all access to the instance – e.g. In the preparation of the instance for RKS, we need to isolate the chosen instance. These steps should be performed for all instances of the SAP system being patched. The Rolling Kernel Switch for the SAP instances comprises the following steps: Once the SCS is prepared, physically switch in the new kernel by copying the newly prepared kernel into the /sapmnt/ file system. sapcontrol -nr 00 -function Parameter Value DIR_HOME | tail -1.The home directory of the SCS will generally be the working directory beneath the instance directory but can be checked using sap control on the SCS node as follows: Source and target versions kernels must be RKS compatible.Īfter downloading and preparing the new kernel and before starting the RKS, you need to prepare the central services (SCS). Copy the file “StoC.xml” located in the newly prepared kernel location to the directory of the SCS instance denoted by system parameter $DIR_HOME.Download relevant SAPEXE.SAR and SAPEXE.SAR archives and extract them in DIR_CT_RUN (central executable directory) using SAPCAR.Backup DIR_CT_RUN in we want to import new kernel patch.RFC’s must be configured with load balancing, if a single host is used, chances are to get they failed.VMC must be active in at least two AS ABAP instances or in none.We can verify this by checking if the UPD work process exists for all/ at least 2 application servers in the group.If we are using update server groups, we should check if each group is RKS compatible.Use local IGS services as this service might get stopped/restarted.Use a logical spool server instead of an application server which can be defined in SPAD to avoid any print failure during this activity.Avoid long-running background jobs when RKS is scheduled.As of 7.4x version, RKS procedure does not support any DUAL stack or JAVA stack systems.the system is a high availability system with clustered central services (SCS) and associated replicated enqueue managed by an enqueue replication server (ERS). Other are automatic checks that are executed by the RKS process itself.Īnother major pre-requisite to using the RKS is the ability to stop each application server without the overall availability of the system being affected – i.e. Some of these are manual and must be performed by the system administrator. This blog focuses on the manual procedure at present but will be extended later to include the automated procedure.īefore the RKS process can be executed there are pre-requisite checks that must be carried out beforehand. Automated RKS Procedure for 7.4x Releases.The RKS is available for the following kernel releases with the associated method: ![]() SAP note 953653 Rolling Kernel Switch and SAP help page Rolling Kernel Switch (RKS) can be used in conjunction with this blog. Ø 2254173 Linux: Rolling Kernel Switch in Pacemaker-based NetWeaver HA environments Important SAP notes to review in relation to SAP Rolling Kernel Switch (RKS) are: ![]() The Rolling Kernel Switch (RKS) can be used to minimize the planned downtime in high availability systems in order to implement a new kernel patch level. RKS can also be used to make parameter changes while the system is running. The rolling kernel switch (RKS) is an automated procedure that enables the kernel in an ABAP system to be exchanged without any system downtime.
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