VAST Block CSI Driver 2.6.6 Release Notes

VAST Block CSI Driver 2.6.6 is released to General Availability as of August 2026.

​To upgrade to VAST Block CSI Driver 2.6.6, follow the upgrade procedure in the ​​VAST Block CSI Driver 2.6 Administrator's Guide​​​.

​New Features

​Asynchronous Replication of Block Volumes

VAST Block CSI Driver 2.6.6 supports asynchronous replication of block volumes between VAST clusters, with an ability to perform a failover to the secondary replication peer. Multiple replication destinations are supported.

NOTE: ​Asynchronous replication of block volumes requires VAST Cluster 5.5.0 or later.

​To configure replication with the driver, use VAST CSI Replication Operator that offers automated replication management based on the replication CRDs you supply. For more information and guidance, see ​VAST Block CSI Driver Administrator's Guide​​.

The following limitation applies:

• ​VCSI-488: Creating a PVC from a snapshot (or from another PVC) on a source or destination replication peer is not allowed.

​Enhancements

• ​VCSI-372: Added support for the ReadOnlyMany (ROX) access mode for block volumes with ​volumeMode: Filesystem​​. To allow or disallow attaching filesystem volumes with the ROX mode, use the ​allowROManyBlockFsMode​​ parameter in the driver's Helm chart configuration file. By default, ROX is not allowed.

• ​VCSI-358: Changed the default priority class for the VAST CSI node pod from ​system-cluster-critical​ to ​system-node-critical​​.

• ​VCSI-388: Added NVMe controller metrics that can be exported to Prometheus. The new metrics provide real-time information about NVMe controllers connected to the node.

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