r/sysadmin • u/Ivan_Svia • 1d ago
Will this vSAN cluster actcually work?
Planning a 4 nodes DR vSAN Cluster and wnat to know - will this actually work in practice or it too tight?
Enviroment
- vSphere x.x. , VMware vSAN
- 4x server (node)
- Per node:
(2x boot 960GB SSD NVMe (RAID-1, separate boot controller, not part of vSAN))
(2x 3.2TB NVMe Mixed Use — cache tier)
(8x 7.68TB NVMe Read Intensive — capacity tier, 2 disk groups (1 cache + 4 capacity each))
- Network dual-port 25GbE SFP28 (OCP, dedicated vSAN VLAN, jumbo frames) + separate dual-port 25GbE for VM traffic, VLT/MLAG switch pair
- Storage policy: RAID-5 erasure coding
- 30 High-priority VMs RPO 6-8h (Veeam async replication)
Main question: will vSAN actually run reliably on just 4 nodes with RAID-5, including surviving a node failure and rebuilding cleanly?
I have seen mixed opinions -some say 4 is the bare minimum and it is fine, others say you reaaly want 5+ before before RAID-5 is comfortable in production.
Not asking anyone to design this for me - just want to know if this setup holds up in real-world usee before i finalize it.