Openshift on AWS: Need a storage class which should support pod scale up

Issue

We are currently running applications on AWS with a single pod, each utilizing a Persistent Volume Claim (PVC) backed by a storage class provisioned through ebs.csi.aws.com. However, when we attempt to scale the pods, the new instances fail to start due to a “multi-attach error.” This is a limitation of AWS EBS volumes, which do not support concurrent attachment to multiple nodes.

We are seeking a solution—either a different storage class or an alternative approach—that supports multi-attach volumes, enabling us to scale pods horizontally without storage-related constraints.

This limitation is blocking our ability to scale certain microservices, severely affecting application redundancy and reliability. Without a scalable and multi-attach-capable storage solution, our architecture remains vulnerable to single points of failure, and high availability cannot be guaranteed for critical workloads.