NaoShift.ionaoshift.io

Simulate, anticipate, protect your infrastructure

Test your cluster resilience before incidents occur. Simulate node or site loss, plan server additions or removals, and validate your N+1 capacity.

Two complementary modules

Disaster Recovery and Capacity Planning share the same cluster simulator

Disaster Recovery

Simulate node or complete site loss and visualize automatic VM redistribution.

Capacity Planning

Plan node additions or removals and anticipate your capacity needs over 12 months.

Node loss simulation

Simulate host loss in a cluster and visualize automatic VM redistribution across remaining nodes.

Site loss simulation

Test complete datacenter loss in a stretched cluster. VMs failover to the surviving site.

N+1 validation

Verify your cluster can withstand node loss without service degradation. Alert if redundancy is insufficient.

Smart rebalancing

Best-Fit Decreasing algorithm: largest VMs are placed first on least-loaded nodes.

Add node

Simulate adding a server and visualize the impact on occupancy, N+1 redundancy and cost.

Remove node

Simulate removing an underused server. Validate the cluster remains operational after consolidation.

Capacity projection

Anticipate your needs over 12 months. Identify when an additional node becomes necessary.

Simulation history

Each simulation is recorded with its results: redistributed, failed and kept VMs.

Your cluster under normal conditions

Visualize CPU and RAM occupancy for each node with distributed VMs

Production ClusterCPU45%RAM55%12 VMsESX-01CPU55%RAM63%15 VMsESX-02CPU35%RAM39%8 VMsESX-03CPU25%RAM29%5 VMsESX-04Cluster: 4 active nodes | Avg occupancy: 40% | N+1: OK

Simulation: node loss

ESX-02 fails — VMs are automatically redistributed across surviving nodes

After ESX-02 failure — VMs redistributedCPU65%RAM76%17 VMsESX-01FAILEDESX-02CPU60%RAM66%14 VMsESX-03CPU55%RAM61%12 VMsESX-04Cluster: 3 active nodes | Avg occupancy: 60% | N+1: OK
15
VMs redistributed
0
VMs failed
60%
Occupancy after failover

Stretched Cluster: site loss

Simulate complete datacenter loss in a cluster spanning 2 sites

Site A — Paris50% | 10 VMsESX-0145% | 8 VMsESX-02ISLSite B — London40% | 7 VMsESX-0335% | 6 VMsESX-04
Site A — ParisSITE LOSTESX-01ESX-02Site B — London82% | 16 VMsESX-0378% | 15 VMsESX-04VM failover

Capacity Planning: add a node

3 overloaded nodes → add ESX-04 → automatic rebalance

Before

CPU85%RAM84%18 VMsESX-01CPU82%RAM80%16 VMsESX-02CPU88%RAM87%19 VMsESX-03Cluster: 3 active nodes | Avg occupancy: 85% | N+1: AT RISK

After addition

CPU62%RAM63%13 VMsESX-01CPU60%RAM61%12 VMsESX-02CPU65%RAM66%14 VMsESX-03CPU58%RAM58%14 VMsESX-04NEWCluster: 4 active nodes | Avg occupancy: 61% | N+1: OK
N+1 redundancy restored

Capacity Planning: remove a node

4 underused nodes → remove ESX-04 → consolidation

Before

CPU30%RAM29%6 VMsESX-01CPU28%RAM27%5 VMsESX-02CPU32%RAM31%7 VMsESX-03CPU25%RAM23%4 VMsESX-04Cluster: 4 active nodes | Avg occupancy: 29% | N+1: OK

After removal

CPU40%RAM38%8 VMsESX-01CPU38%RAM36%7 VMsESX-02CPU42%RAM41%9 VMsESX-03REMOVEDESX-04Cluster: 3 active nodes | Avg occupancy: 40% | N+1: OK
Savings: 1 hypervisor license

Key metrics

N+1

Automatic redundancy validation

100%

VM redistribution rate

<1min

Simulation time

Multi-site

Stretched cluster support

Frequently asked questions

The simulation uses real data from your infrastructure (RVTools import or API connection). When you simulate node loss, the Best-Fit Decreasing algorithm automatically redistributes VMs across remaining nodes, prioritizing the largest VMs on the least-loaded hosts. You instantly see which VMs are relocated, which fail due to insufficient capacity, and the impact on CPU/RAM occupancy.

Ready to test your infrastructure resilience?

Import your RVTools and launch your first simulation in minutes.

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