Depending what you’re looking to accomplish, setting up a cluster in VMs 
(VirtualBox, Fusion, cloud provider, etc) may meet your needs without having to 
buy anything.

> 
> - Don't think having a few 1Gbit can replace a >10Gbit. Ceph doesn't use 
> such bonds optimal. I already asked about this years ago. Having a 10Gbe 
> might make a SBC solution more costly than estimated.

10GE is out of scope for sure, but a note about bonding:  more than once I’ve 
seen NICs bonded improperly, or tested improperly.

* Bonding doesn’t make a single faster interface - you need multiple clients to 
be able to utilize it well
* If the hash policy isn’t set right, it’s easy to have *all* of your traffic 
routed over a single link, and your throughput will be capped at half what you 
expect
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