What must shared storage for cluster vaults support?

Shared storage for cluster vaults must support persistent reservation to ensure that access to the storage is managed properly among multiple nodes in a clustered environment. Persistent reservation is a mechanism that allows one node in the cluster to "reserve" access to specific storage resources, which is critical for maintaining data integrity and consistency. This is especially important in scenarios where multiple nodes may attempt to access the same data concurrently. By allowing a node to reserve access, the system can prevent conflicts and ensure that only the designated node modifies the data during that reservation period.

In a clustered vault environment, where multiple instances may access and utilize the same backend storage, persistent reservation plays a vital role in coordinating these accesses and preventing data corruption. When combined with the functionalities of the cluster architecture, such as failover and load balancing, persistent reservation enhances the reliability and performance of the cluster.

While snapshots, high availability, and dynamic allocation can all be beneficial features in various storage solutions, they do not specifically address the critical requirement for access control and data integrity that persistent reservation fulfills in a clustered vault system.