SSD Cache Vs NVME speed comparison help

[Superdean56]

Hey guys, 

I am hoping someone can shed some light and explain something to me. I’ve always read that passing through an nvme to a vm is better and faster than creating a v-disk on your cache drive

 

I have a main disk (c drive) for my vm that’s a 70GB virtio disk sitting on the cache that has windows 10 on it and a NVME (d drive) drive that is being passthrough as a secondary drive for the vm. 
The main disk (c drive) scores 21GB/s and the NVME (d drive) scores 2.4GB/s. The NVME is scoring correctly but How is it possible that I’m getting 21GB/s from the cache drive?!?

 

Current setup:

- i9-990k CPU

- ASRock B365M Phantom Gaming 4 Mobo

- 2x16 Corsair vengeance RAM

- 1 - 10TB parity drive

- 3 - 8TB disks

- 512GB crucial SSD for cache

- 1080super passthrough for vm

- quadro p600 for plex

- 1TB NVME western digital SN550 passthrough for vm

 

 

 

[Vr2Io]

5 hours ago, Superdean56 said:

How is it possible that I’m getting 21GB/s from the cache drive?!?

Those not real, it is cached.

[Superdean56]

What do you mean?

 

the primary v-disk for the vm is in the domains folder that is sitting on the cache drive 

[unrateable]

17 minutes ago, Superdean56 said:

What do you mean?

 

the primary v-disk for the vm is in the domains folder that is sitting on the cache drive 

its a caching that happens between VM and host, which distorts the measuring

Edited October 5, 2020 by unrateable

[Superdean56]

1 hour ago, unrateable said:

its a caching that happens between VM and host, which distorts the measuring

Ohhh I see, thank you for answering!