Turn on "Discard" option?

you need to set cache of vdisk to "write back" to have same performance of bare metal, because proxmox set cache to none by default.
 
you need to set cache of vdisk to "write back" to have same performance of bare metal, because proxmox set cache to none by default.
write-back is unsafe, the chances of losing data is much higher. This needs to be mentioned before recommending it for performance.
 

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