# Vercel — Preparing for the worst: Our core database failover test

- Company: Vercel (vercel.com)
- Announced: 2025-08-28T13:00:00+00:00
- Category: not stated
- Coverage: not counted
- Announcement: no
- Group: routine
- Source: https://vercel.com/blog/preparing-for-the-worst-our-core-database-failover-test
- Record: https://forck.live/items/20830-preparing-for-the-worst-our-core-database-failover-test
- Subject: v0 / AI SDK / AI Gateway

Vercel performed a full production failover of its core control-plane database from Azure West US to East US 2 on July 24, 2025, with zero customer impact. The test followed two major Azure West US power failures in 2024 that had prevented critical write operations. Preparation involved 57 staging failovers and revealed issues such as proprietary Cosmos DB clients lacking failover awareness and hardcoded delays that were subsequently reduced from five minutes to five milliseconds.

## Evidence

Verbatim from https://vercel.com/blog/preparing-for-the-worst-our-core-database-failover-test:

> On July 24, 2025, we successfully performed a full production failover of our core control-plane database from Azure West US to East US 2 with zero customer impact.

---

Record: https://forck.live/items/20830-preparing-for-the-worst-our-core-database-failover-test
Catalogue: https://forck.live/llms.txt
Current issue: https://forck.live/feed.md