Manuel_Serrano
Contributor
Contributor

Disks for 4TB

Hi.

We are going to mount a vsan cluster with 3 nodes and we need the total capacity of the space available for the machines to be 4 TB. Counting that we are going to mount all flash and raid 1, what total disk space do I need to buy? I know you need to keep a cache space, but I'm not sure how much you need.


Thanks

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IRIX201110141
Champion
Champion

Take a look to https://vsansizer.vmware.com/ or VMware® vSAN™ Design and Sizing Guide | VMware

In a AFA configuration the "cache" disk is only for buffering the writes. So it depends on how much writes you expect.  Normal drive size would be between 400-800 GB (iirc in early vsan version the was a 800gb "limit").  The "buffer" device doesnt count into capacity calculation.  So 4TB VMs *2 (RAID1) + Witnesses + vSAN Overhead + Free space = needed space. Something like a couple of 960GB RI SATA/SAS SSD for example.

You can lurking to the ReadyNodes configuration from HPE/DellEMC if you like.

Regards,
Joerg

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