FYI
Since September 25th 2014 we haven’t seen any firmware update from LSI for 9207-8i (20.00.00.00). Yesterday I checked LSI’s websites and found the same P20 firmware package listed. However this time the release date was different, May 21st 2015, but the same P20 versioning. After looking at the archive/rlsnotes the only thing to change was the firmware, 20.00.04.00 – 9207-8.bin. No release notes on changes to the firmware that I could find. So for those on other LSI cards/firmware, don't be quick to dismiss the idea of a sneaky update being available.
I have installed it on my Lab cluster (one day), and its seeing major magnetic disk latency improvements during component tasks. It seems to behave more consistently across various workloads. The "mpt2sas" 2308 LSI driver for ESXi is still at 20.00.00.00.1, which im running, hopefully there will be a corresponding update soon. The performance and stability really isn't there when running P19 Firm and mpt2sas v19 IMHO.
Cheers.