# Expand guest-cluster S2D storage without resizing its existing disks

> How should capacity be added to a Storage Spaces Direct guest cluster?

- Canonical URL: https://update.dsesecurity.com/updates/dse-20260908-202-expand-guest-cluster-s2d-storage-without-resizing-its-existing-disks/
- Publisher: Detection Systems & Engineering (DSE Security)
- Author: DSE Security Editorial Team
- Published: 2026-09-08T18:13:49+00:00
- Modified: 2026-09-08T18:29:33+00:00
- Last reviewed by DSE: 2026-09-08
- Resource type: Guide
- DSE priority: Information
- Topics: Business Continuity, IT
- Reading time: 2 minutes

## What you need to know

How should capacity be added to a Storage Spaces Direct guest cluster?

## Potentially affected

Administrators running Storage Spaces Direct inside a VM guest cluster.

## DSE recommendation

Prepare a disk inventory for every guest node with identifiers, capacity, and presentation settings.

## Article

## Source facts

Microsoft documents Storage Spaces Direct guest clusters as shared virtual storage built across multiple VMs. The exposed virtual disks must keep their existing size and characteristics. Its capacity-expansion procedure adds more virtual disks to each VM and then to the pool, recommending disks with the same size and characteristics as the existing ones. [Microsoft Learn](https://learn.microsoft.com/en-us/windows-server/storage/storage-spaces/storage-spaces-direct-in-vm).

## Applicability

Confirm the guest-cluster platform, underlying VM placement, and current virtual-disk layout. Review the guest-cluster requirements for the actual hypervisor before making a storage change. Keep a host-level disk expansion and a guest-cluster pool expansion as separate operations.

## DSE recommendation

Prepare a disk inventory for every guest node with identifiers, capacity, and presentation settings. Have the storage owner review the additional-disk plan against that inventory. Record the expected new pool capacity and the assignment of every added disk before execution. Preserve a recoverable configuration record and schedule the change with the application owner rather than resizing an existing disk as an informal shortcut.

## Verification

After the approved addition, inspect the disks presented to each guest and compare their characteristics with the plan. Confirm pool membership, health, and the expected capacity increase. Exercise a representative application transaction and record any asymmetric node configuration. Resolve missing or unexpected disks before creating or extending workloads on the new space.

## Official references

[Microsoft Learn: Using Storage Spaces Direct in a virtual machine](https://learn.microsoft.com/en-us/windows-server/storage/storage-spaces/storage-spaces-direct-in-vm). Source reviewed September 8, 2026.

## Primary reference

- Name: Using Storage Spaces Direct in a virtual machine
- Authority: Microsoft Learn
- URL: https://learn.microsoft.com/en-us/windows-server/storage/storage-spaces/storage-spaces-direct-in-vm
- Source publication date: Not stated by the source

## Citation and use

Preferred citation: “Expand guest-cluster S2D storage without resizing its existing disks,” DSE Security, https://update.dsesecurity.com/updates/dse-20260908-202-expand-guest-cluster-s2d-storage-without-resizing-its-existing-disks/
Publishing principles: https://update.dsesecurity.com/updates/dse-updates-editorial-methodology/
Usage and citation policy: https://update.dsesecurity.com/usage/
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