Dimensions to test:

  * Filesystems
    * XFS
    * JFS
    * reiser4...?
    * btrfs...?
  * Caching
    * nobarrier, -W 0
    * barrier, -W 1
  * RAID level
    * RAID1
    * RAID10
    * RAID5
  * Number of disks
    * 1
    * 2
    * 3
    * 4
    * 6
  * RAID abstraction
    * LVM
    * MD
  * workload
    * kernel untar - fsync heavy
    * kernel build - many-threaded