Tim Litton has published the results of testing where the performance of fixed and dynamic disks were compared. Fixed disks generally performed 10-15% better.
When considering fixed versus dynamic disks:
- Fixed disks (and pass-through disks) are the only disks that PSS support in production.
- Dynamic (and differencing) disks are great in labs where you have smaller physical storage capacities.
On a related note, some details from QLogic on their performance testing with 8GB fibre channel HBA’s (a few months ago prior to RTM) are available.