With new updates of FusionIO drivers I was able to test it on our Dell R900 with Ubuntu 8.10 without pain of compiling drives myself and downgrading to older kernel, so I was decided to test it in strict_sync mode.
As I understand FusionIO in default mode, like Intel SSD, is “lying” to application, and fsync() is not real, it still commit only to internal memory, not to final media. And FusionIO has “strict_sync” mode to guarantee fsync is trustworthy.
So let’s benchmark it – as usually I do tpcc-mysql benchmark on 100W (9GB data) with 3GB buffer_pool in O_DIRECT access.
The raw number are here
and graph is
Results are in TPM (Transactions Per Minute), more is better, and graph shows how result is changing in time ( axis X ).
It is too obvious from graph to comment it…
I actually did not test if you really loose transactions in case of power outage in default mode, this is something to check.