To get an idea of the efficiency of EPRD caching I repeated the lessfs benchmark test with EPRD caching the Intel 320 SSD.
The Intel 320SSD was registered as /dev/sdc.
EPRD was setup like this : ./eprd_setup -f /dev/sdc -m 3 -b -p 2048M
The databases eventually reach a size of 8.5 GB during this test.
As the graph’s show a user space application like Lessfs speeds up with EPRD even when it is used to cache a relatively fast medium like an Intel 320 SSD. I intend to test EPRD with a number of other applications as well. Candidates that come to mind are for example openldap and Mysql.