---
title: "VAST Block CSI Driver 2.6.4 Release Notes"
slug: "vast-block-csi-driver-264-release-notes-2-6"
updated: 2026-11-04T00:13:56Z
published: 2026-11-04T00:13:56Z
canonical: "docs.vastdata.com/vast-block-csi-driver-264-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 2.6.4 Release Notes

VAST Block CSI Driver 2.6.4 is released to General Availability as of October 2025.

To upgrade to VAST Block CSI Driver 2.6.4, 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 and Capabilities

### Automatic Cleanup of Unused Driver-Generated Host Entries

The driver can automatically clean up unused VAST host entries (NQNs that were automatically generated by the driver) when they are no longer in use by any PVCs on the corresponding Kubernetes node. This capability is helpful in Kubernetes environments with dynamic or ephemeral node pools where hostnames are changing frequently. If it is disabled, unused host entries keep accumulating and need to be deleted manually.

To enable or disable automatic cleanup of unused auto-generated host entries, use the `blockHostsAutoPrune` parameter in the driver's Helm chart configuration file. By default, the cleanup is disabled.

### Fine-tuning Host Encryption Performance

Added support for the following storage class parameters that can be used to fine-tune encryption performance:

```plaintext
 perf-same_cpu_crypt: true           # Use same CPU for encryption work
 perf-submit_from_crypt_cpus: true   # Submit IO from crypt CPUs
 perf-no_read_workqueue: true        # Bypass read workqueue
 perf-no_write_workqueue: true       # Bypass write workqueue
```

By default, all the parameters are set to `true`.

### Default CSI Plugin Container Memory Limit

The default CSI plugin container memory limit (`csiVastPlugin` in the driver's Helm chart configuration file) has been increased from 400Mi to 500Mi.