VAST CSI Driver 2.6.6 is released to General Availability as of August 2026.
To upgrade to VAST CSI Driver 2.6.6, follow the upgrade procedure in the VAST CSI Driver 2.6 Administrator's Guide.
New Features
Asynchronous Replication
VAST CSI Driver 2.6.6 adds support for asynchronous replication of volumes between VAST clusters, with an ability to perform a failover to the secondary replication peer. Replication from one cluster to multiple replication destinations is supported.
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 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.
mTLS Support
VAST CSI Driver supports mTLS authentication on client NFS connections to the VAST NFS server. In multi-tenant environments, mTLS authentication allows for certificate-based access control and isolation of workloads per storage class.
mTLS authentication for NFS requires VAST Cluster 5.5.0 or later.
To use mTLS with the driver:
Configure the VAST cluster to use mTLS authentication of NFS, as described in the VAST Cluster's Administrator's Guide.
Add the client certificate and the private key to the Kubernetes secret that is used to supply the user's username and password:
--from-file=mtls_client_cert=<certificate> \ --from-file=mtls_client_privkey=<private key> \Configure the storage class to mount with mTLS:
mountOptions: - "xprtsec=mtls"
Enhancements
VCSI-464: Added support for the ReadWriteOncePod (RWOP) access mode to the volumes.
VCSI-358: Changed the default priority class for the VAST CSI node pod from system-cluster-critical to system-node-critical.
Resolved Issues
VCSI-380: Resolved an issue that could cause an error when trying to modify a PVC with nested quotas.