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Redis Cluster

Redis Cluster on vDB is a Redis deployment with a Non-sharding architecture consisting of 1 Master node and up to 9 Replica nodes (2–10 nodes total), with automatic failover and vBackup integration for comprehensive data protection.

Architecture

Redis Cluster on vDB follows a 1 Master – N Replicas model:

  • Master node: Handles all read and write operations.

  • Replica nodes (1–9): Asynchronously replicate data from the Master, serve read operations, and are ready for failover.

  • Automatic Failover: When the Master fails, a Replica is automatically promoted to become the new Master. The cluster continues to operate after failover completes.

β”Œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”
β”‚   Master    β”‚  ← Read / Write
β””β”€β”€β”€β”€β”€β”€β”¬β”€β”€β”€β”€β”€β”€β”˜
       β”‚ Async Replication
  β”Œβ”€β”€β”€β”€β”΄β”€β”€β”€β”€β”
  β–Ό         β–Ό
Replica 1  Replica 2 ...  ← Read / Failover

Scope: Redis Cluster on vDB currently supports Non-sharding mode (single shard only). Multi-shard sharding will be developed in a future release.

Single-node vs Cluster Comparison

Feature
Single-node
Cluster (Non-sharding)

Masters

1

1

Max Replicas

5

9

Automatic Failover

No

Yes

Read Scaling

Yes (via replicas)

Yes (via replicas)

Write Scaling

No (single writer)

No (single writer)

Backup Integration

No

Yes (vBackup β€” Policy + Location)

Best for

Dev, staging, small workloads

Production, High Availability

Scaling Replicas

You can change the number of Replicas in a Cluster after creation with no downtime. The system performs scaling step by step:

  • Scale up: Adds one replica at a time, waiting for each replica to complete its initial sync before adding the next.

  • Scale down: Removes replicas in descending index order, waiting for each step to complete before proceeding.

Each change can only increase or decrease by 1 node at a time. The UI shows only two options (currentβˆ’1 or current+1) β€” jumping multiple steps in a single action is not allowed. This ensures each sync completes before the next step, preventing replication errors during abrupt scaling.

Backup Integration (vBackup)

Redis Cluster has built-in integration with vBackup to protect your data:

  • Auto Backup: Runs on the schedule defined by the Backup Policy selected during cluster creation.

  • Manual Backup: Create a Full Snapshot on demand at any time from the cluster detail page.

  • Restore: Create a new cluster from an existing restore point in Backup Center.

Detail
Value

Backup type

Full Snapshot (Incremental not supported)

Storage

vStorage (S3-compatible) with Object Lock

Concurrency limit

1 backup job at a time

When quota exceeded

Returns QuotaExceeded error, no auto-retry

Next Steps

I want to...
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Create a new Redis Cluster

Create a Redis Cluster

Manage topology, backups, delete cluster

Manage a Redis Cluster

View limitations and constraints

Limitations

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