What do others use for measuring I/O statistics? I'd like something versatile, as in being able to watch (like iostat, but easier to trend), generate load (like iozone, but more realistic), and perform somewhat generalized benchmarks (like bonnie, but more current.) It would scale from a few filesystems to several hundred filesystems.
Another utility I'd like to keep my eye for would be a way to list outstanding lock operations...
This would all be used on GNU/Linux systems, SLES and RHEL. Basically, generate a load of read/write activity similar to production without having actual production - piece of cake, no? 