Fusion-IO and MySQL 5.5 at craigslist, Jeremy Zawodny

MySQL 5.5 has innodb compression? saved 100 - 200gb of overhead, they compress pretty well. just did 2:1 compression

xfs on raid boxes, also using xfs on Fusion-IO

issues with trying to use intel drives, linux doesn't have trim support, degrade after lot of write cycles
  * all vendors are putting effort into wear leveling
  * even if they slow down 20%, they probably won't notice
  * think they can run full bore, and will replace machines before SSD runs out

been live on fusion-io...
  * took awhile to trust them, had some initial issues with fan speed and firmware
  * have been pretty solid with latest drivers / firmware
  * taking full traffic for 2 weeks

they don't trust replication, because when slave crashes, it might not start at the right place
  * they always re-clone when a slave db fails

chose fusion-io because they were ready to try ssd, thought PCIe was better than SATA style, and Fusion-IO was best in market last year. more options now.