---
title: "VAST Block CSI Driver 2.6.6 Release Notes"
slug: "vast-block-csi-driver-2-6-6-release-notes-2-6"
updated: 2026-11-04T00:12:37Z
published: 2026-11-04T00:12:37Z
canonical: "docs.vastdata.com/vast-block-csi-driver-2-6-6-release-notes-2-6"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.vastdata.com/llms.txt
> Use this file to discover all available pages before exploring further.

# 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*](/develop/docs/block-csi-driver-administrators-guide-2-6)​​​.

## ​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 2.6 Administrator's Guide*](/develop/docs/block-csi-driver-administrators-guide-2-6)​​​..

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.

​

​