USB to increase RAM

[John Levine]

In article <MWHPR04MB049571F2BA1149AC4E36D41980070 at MWHPR04MB0495.namprd04.prod.outlook.com> you write:
>Windows has a feature called "ReadyBoost" that can use a USB drive to
>increase RAM.

ReadyBoost uses an SSD as a cache between RAM and the regular disk.
More details here:

https://en.wikipedia.org/wiki/ReadyBoost

To do more or less the same thing with ZFS, add the USB disk as a
cache device to your disk pool.  Look at the zpool man page, and
search for "Cache devices".