<p dir="ltr">I don't know what your host system is but think that in case of virtulization most of disk activity could happens in host OS memory aka cache.</p>
<p dir="ltr">I have few old systems around. Pentium MMX 200 MHz 16 MB RAM. Pentium II 300 and Pentium III 550 also "newer :)" Pentium III 850 Mhz. Could do some testing for acurate results.</p>
<p dir="ltr">The old Pentium could be only small firewall with that much RAM.</p>