The shared storage design selects the appropriate storage device for each type of cluster.

The storage devices for use by each type of cluster are as follows.

Management clusters use vSAN for primary storage and NFS for secondary storage.

Shared edge and compute clusters can use FC/FCoE, iSCSI, NFS, or vSAN storage. No specific guidance is given as user workloads and other factors determine storage type and SLA for user workloads.

Logical Storage Design
Management clusters use Virtual SAN for primary storage and NFS for secondary storage. Shared edge and compute clusters can use FC/FCoE, iSCSI, NFS, or vSAN storage.
Storage Type Design Decisions

Decision ID

Design Decision

Design Justification

Design Implication

SDDC-VI-Storage-001

In the management cluster, use vSAN and NFS shared storage:

Use vSAN as the primary shared storage platform.

Use NFS as the secondary shared storage platform for the management cluster.

vSAN as the primary shared storage solution can take advantage of more cost-effective local storage.

NFS is used primarily for archival and the need to maintain historical data. Leveraging NFS provides large, low cost volumes that have the flexibility to be expanded on a regular basis depending on capacity needs.

The use of two different storage technologies increases the complexity and operational overhead.

SDDC-VI-Storage-002

In all clusters, ensure that at least 20% of free space is always available on all non-vSAN datastores.

If the datastore runs out of free space, applications and services within the SDDC, including but not limited to the NSX Edge core network services, the provisioning portal and VDP backups, will fail. To prevent this, maintain adequate free space.

Monitoring and capacity management are critical, and must be proactively performed.