A Success Story: MySQL on OpenSolaris
Check out this blog: Success with OpenSolaris + ZFS + MySQL in production! by Don MacAskill at SmugMug. It discusses his favorable impressions from running MySQL on OpenSolaris in production and concurrently benefiting from the volume and file-system management capabilities offered by ZFS.
To quote MacAskill, "[ZFS] is pure heaven to work with. This is how file systems should have always been. The commands to create, manage, and extend pools are so simple and logical you basically donâ€™t even need man pages." Coming from a self-proclaimed "Linux geek," that's high praise indeed.