TheBobkin
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Hello ManivelR​,

"Can i club all these 10 ESXi servers to make as a vSAN ? "

Likely not but this depends on more precisely what you have available and/or what you can add; vSAN requires a) true locally attached storage b) a combination of SSDs/NVMe for cache + HDDs/SSDs for capacity-tier (up to 7 per Disk-Group, 5 Disk-Groups per node) and c) components on the vSAN HCL.

"If there is any host failure or any disk failure,it will sustain failure ? or i need to get the same storage capacity from all the 10 ESXi servers to make as a vSAN ??"

vSAN protects data by placing mirrors of data-Objects on multiple Fault Domains - each node being a Fault Domain if not specified otherwise so for instance if you had a 10 node cluster with FTT=1 applied to the data it can tolerate one node failure and rebuild the data back to FTT=1. You don't necessarily need all nodes to contribute the same amount of storage (or technically some can have none) but this would be fairly imbalanced from a resilience perspective.

"We no need to configure any RAID from the hardware level right ?  Please confirm."

No - RAID is applied at the data-Object level (and for some controllers RAID0 individual RAID0 VDs for each device).

Bob

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