Upgrade or downgrade a Milvus instance - Vector Retrieval Service for Milvus

Prerequisites

The instance status is Running.
Your Alibaba Cloud account has no unpaid orders.

Pay for or cancel unpaid orders first.

Version limitation: You cannot upgrade an entry-level edition instance to Standard Edition.
Impact:
- No operations can be performed on the instance during this process. We recommend that you perform this operation during off-peak hours.
- The process is seamless and does not affect query or write paths. This ensures business continuity.
Upgrade:
- Upgrades typically take a few minutes and mainly involve allocating and initializing new nodes.
- After scale-out, the instance automatically performs data migration (data rebalancing) to ensure even distribution.
- Data rebalancing usually takes several to tens of minutes depending on cluster load.
Downgrade:
- A downgrade first migrates data from removed nodes to remaining nodes to ensure data is safely migrated. Migration usually takes several to tens of minutes depending on cluster load.
- After migration, the system releases the downgraded nodes and their resources.

Go to the instance list page.
1. Log on to the Alibaba Cloud Milvus console.
2. In the left navigation pane, click Milvus Instances.
3. In the top menu bar, select a region.
On the Instance List page, find the target instance and click Upgrade in the Actions column.
On the Upgrade/Downgrade page, modify the node specifications and node count, and click Buy Now.

View the instance status on the Instance List page. Running indicates that the instance has been successfully created.

On the Instances page, find the target instance and choose > Downgrade from the Actions column.
In the dialog box that appears, review the notes and click OK.
On the Downgrade page, modify the node specifications and node count, and click Buy Now.

View the instance status on the instance list page. Running indicates that the instance is created.