Considerations for Virtual Flash Resource

When you configure a virtual flash resource, several considerations apply.

• You can have only one virtual flash resource on a single ESXi host. The virtual flash resource is managed at the host's level.
• You cannot use the virtual flash resource to store virtual machines. Virtual flash resource is a caching layer only.
• You can use only local flash devices for the virtual flash resource.
• You can create the virtual flash resource from mixed flash devices. All device types are treated equally and no distinction is made between SAS, SATA, or PCI express connectivity. When creating the resource from mixed flash devices, make sure to group similar performing devices together to maximize performance.
• You cannot use the same flash devices for the virtual flash resource and vSAN. Each requires its own exclusive and dedicated flash device.