Thanks. As I discovered from that post, VB does not have cache flush enabled by 
default. Ignoreflush must be explicitly turned off.

VBoxManage setextradata VMNAME 
"VBoxInternal/Devices/piix3ide/0/LUN#[x]/Config/IgnoreFlush" 0

where VMNAME is the name of your virtual machine.


Although I tried that it it returned with no output (indicating it worked) but 
it still won't detect a pool that has been destroyed. Is there any way to 
detect if flushes are working from inside the OS? Maybe a command that tells 
you if cacheflush is enabled?

Thanks.
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