A company recently implemented its SAP S/4HANA system on AWS. An SAP engineer must set up a Pacemaker cluster on Amazon EC2 instances to provide high availability.
Which solution will meet this requirement?
A.
Set up a fencing mechanism for the cluster by using a block device.
B.
Set up an overlay IP address as a public IP address.
C.
Create a route to the overlay IP address on the on-premises network.
D.
Create an EC2 instance profile that has an IAM role that allows access modification of the route table.
https://docs.aws.amazon.com/sap/latest/sap-hana/hana-ops-ha-dr.html
The pacemaker cluster uses a virtual IP address to connect to the master SAP HANA instance. The virtual IP address is migrated to the secondary instance during failover. The secondary instance is then promoted as active primary for traffic redirection. An overlay IP address is used for the networking configuration on AWS. It is a virtual IP address configured to point to the master SAP HANA instance whether it is on the primary node or secondary node. You can configure overlay IP routing with AWS Transit Gateway or Network Load Balancer.
D: In order to provide high availability with Pacemaker cluster on Amazon EC2, you need a method for the cluster to manage node-level failures. This is known as "fencing" in Pacemaker. However, traditional fencing mechanisms like using block devices or power switches are not applicable in a cloud environment like AWS. Instead, you can leverage EC2 instance profiles with an IAM role that allows the modification of route tables. This IAM role can be used to reroute network traffic, essentially performing the "fencing" action in the AWS context.
A.
A fencing mechanism is used to prevent split-brain scenarios in Pacemaker clusters. A block device is a common fencing mechanism used in AWS environments. It is used to ensure that only one node can access the shared storage at any given time. This is done by blocking access to the shared storage from all nodes except the one that has been granted access by the fencing mechanism
https://docs.aws.amazon.com/sap/latest/sap-hana/hana-ops-ha-dr.html
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