I have used unraid for a year now, running basic containers and file shares.
Initially I misunderstood unraid's cache mechanism (thinking it was both ways) and have been disappointed there is not a read cache option.
I have intermittently encountered download issues and slow play stutter which I attribute to the slower HDD spinning up.
Seems an oversight that such a basic feature as a read cache is missing.
I have an SSD installed in my system that I would immediately change to a read cache if available today.
