---
title: "VAST COSI Driver Workflow"
slug: "vast-cosi-driver-workflow-2-4"
updated: 2026-11-04T19:58:59Z
published: 2026-11-04T19:58:59Z
canonical: "docs.vastdata.com/vast-cosi-driver-workflow-2-4"
---

> ## 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 COSI Driver Workflow

VAST COSI Driver lets you use the Kubernetes API to create and manage S3 buckets, and also to manage access to the buckets. After a bucket is provisioned, end users can perform object operations on the bucket.

> [!NOTE]
> **Note**
> 
> COSI buckets can be provisioned on the default VAST Cluster tenant only.

To provision a bucket with VAST COSI Driver:

1. In the VAST COSI Driver [chart configuration file](/develop/docs/create-a-helm-chart-configuration-file-for-vast-cosi-driver-2-4#create-a-configuration-file), specify a `Bucket Class` that provides parameters and attributes to be used when provisioning buckets through VAST COSI Driver. You can use a predefined bucket class provided with VAST COSI Driver, or you can define one or more custom bucket classes.
2. Create and apply a Kubernetes YAML configuration file with the following definitions:

  - A `BucketClaim`, which is a request to create a bucket of the bucket class specified for the driver.
  - A `BucketAccessClass`, which provides various options and settings for bucket access requests made through the driver.
  - A `BucketAccess` request, which contains credentials that can be used to access the bucket.