[PetiteCloud] USB3 Flash for ZFS

[Michael Thoreson]

I have confirmed that USB3 flash drives can serve as L2ARC caches for 
ZFS. I am using a Kingston Hyper-x 64GB USB3 for my tests and it 
significantly increased writes between 3 and 10 fold for datasets with 
dedup set to verify.

Just thought this would be helpful for deployments where 100% SSD nodes 
may be either impractical or out of budget and Ram capacity is limited.

Michael Thoreson,