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Hardware Configuration Requirements
When deploying a stretched cluster, you need to deploy a witness node. The witness node can be deployed on a physical server or a VMware virtualization environment. You can refer to the following table for corresponding hardware planning according to the cluster size.
The arbitration disk does not support the use of mechanical disks. It must be an enterprise SSD and in the compatibility list. Otherwise, it cannot pass the checking.
| Cluster size |
Minimum hardware requirements |
Illustration |
| Small deployment (4 to 6 HCI nodes, 2 to 3 for each machine room)
|
CPU: 6 cores Memory: 32GB System disk: capacity > = 128G Witness disk: enterprise SSD with capacity > 100GB. Virtualization deployment requires no less than 1000 IOPs. |
Support VMware virtualization deployment and physical machine deployment. |
| Midsize deployment (8 to 16 HCI nodes, 4 to 8 for each machine room) |
CPU: 8 cores Memory: 32GB System disk: capacity > = 128G Witness disk: two 128GB or 248GB enterprise SSDs are used and configured as RAID1 |
Physical machine deployment is recommended. |
| Large deployment (18 to 24 HCI nodes, 9 to 12 for each machine room) |
CPU: 16 cores Memory: 32GB System disk: capacity > = 128G Witness disk: two 128GB or 248GB enterprise SSDs are used and configured as RAID1 |
Be sure to deploy using physical machines. |
Table 4:Selection Requirements of Witness node
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