[linux-lvm] Testing the new LVM cache feature

[Werner Gold]

Many thanks to Alasdair and Heinz for the hint with the tagging feature.
More convenient than dealing with UUIDs.

I also stumbled across the "same VG" issue when I tried to set up the
test environment. Thanks to Richard for that hint. :-)

I ran bonnie++ on my X230 (RHEL7) here where I used an external USB3
SSD. Attached you find the results.

With cache, there is a significant difference in random create. That's
what I would expect from an SSD cache.

Werner
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Werner Gold                                    wgold at redhat.com
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