VISuite Longhorn Disk Capacity Planner

Calculates Longhorn schedulable capacity and PVC allocation impact. Shows Max Elastic (Per‑Node) and Max Elastic (Cluster Avg) plus an adjustable Safe % recommendation (slider + number).

Added: Safe % Slider

Inputs

Disk size

Enter in T (TB) or Gi. Example: 2.5 T or 2328 Gi

Disk Minimal Available (%)

Longhorn reservation. Default often 25%.

Replica count

Longhorn replicas per volume (1/2/3).

replicas

Longhorn nodes

Number of nodes with schedulable Longhorn disks.

nodes

Capacity view mode

Per-Node: checks if this disk can schedule volumes locally.
Cluster-Total: multiplies usage by replica count and uses average per node for warnings.

Per-Node Cluster-Total

PN count

How many PN PVCs on this node

PNs

PN PVC size (each)

Example: 500 or 700 (Gi)

PN model PVC (each)

Example: 20 Gi per PN

PN video PVC (each)

Example: 2 Gi per PN

Elastic ingest PVC

Usually 20 Gi

Elastic master PVC

Usually 20 Gi

RabbitMQ PVC

Example: 10 Gi

Elastic data PVC (optional)

Enter your planned Elastic data PVC

Max Elastic formulas
MaxElastic (Per‑Node) = SchedulableGi − BaselineGi
MaxElastic (Cluster Avg) = (SchedulableGi × nodeCount / replicaCount) − BaselineGi

Safe recommendation
SafeElastic = (Safe% / 100) × MaxElastic

Results

Disk size (Gi)

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Longhorn schedulable (Gi)

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Baseline PVCs (Gi)

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Max Elastic (Per‑Node) (Gi)

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Max Elastic (Cluster Avg) (Gi)

—

Mode-based planned usage

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Safe Elastic Recommendation
Adjust Safe % (slider or number). Applies to both max values.

Safe %: 80%

50% 95%

Safe % (50–95)

Per‑Node safe target: —
Cluster Avg safe target: —

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Replica placement sanity —

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Reminder
Even if Cluster Avg looks fine, a single node can still fail if replicas concentrate or a node is tight.