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Dell vSAN Ready Nodes (R750, R840, R740xd) support up to 24 disks per node. With Dell vSAN Ready Nodes, only all-flash or all-NVMe configurations are supported for SAP HANA. NVMe disks are required for the caching layer. Configurations are supported with a minimum of two vSAN disk groups per node, and a minimum of three capacity disks per disk group is recommended. Based on capacity requirements, you can configure up to four disk groups with a maximum of five capacity disks per disk group.
For the two-socket R650 vSAN Ready Node, up to 10 disks are supported per node. Only all-flash and all-NVMe configurations are supported for SAP HANA with two vSAN disk groups per node, and a minimum of three capacity disks per disk group is recommended.
All vSAN Ready Nodes in a cluster must have the same disk group configuration. For performance reasons, match the number of disk groups in the vSAN cluster to the number of production SAP HANA VMs running in the cluster as a best practice.
Assign the RAID 1 failure tolerance method in the storage policy to the SAP HANA persistence (data and log of each SAP HANA VM), as described in Assign VM storage policies to the SAP HANA persistence. The capacity requirement for data and log devices is twice as much as for SSD/NVMe.
RAID 1 is the default storage policy for all VMs on vSAN and is required for the persistence of production SAP HANA devices. With RAID 5/6, you can create a new capacity-optimized storage policy and assign it to other non-SAP HANA persistent devices. RAID 5/6 consumes 1.33 times the usable device capacity on disk.