I use the term loosely.
This is with the raw drive being a Maxtor MaxlineII 250GB 7200RPM SATA
unit. It's about a 2004 vintage with over 30,000 hours on it. Slow and
steady.
The Cache device is an OCZ Vertex Plus 120GB Unit. Not all that fast or
clever. The Cache has writeback enabled and is formatted with -w512 so
that direct IO worked as previously discussed.
The benchmark is conducted inside an XP VM running under KVM. The device
is a qcow2 backing file formatted NTFS. I ran the test multiple times
without the cache until the numbers stabilised (the backing file was
being expanded as required)
http://www.fnarfbargle.com/private/111022_bcache/Without_Cache.png
http://www.fnarfbargle.com/private/111022_bcache/With_Cache.png
As expected a significant improvement in random small I/O. The VM is far
more responsive with the cache.
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