@TechReport{lo:disks,
  author = {Raymond Lo and Norman Matloff},
  title = {A Probabilistic Limit on the Virtual Size of Replicated File
  Systems},
  year = {1989},
  institution = {Department of EE and CS, UC Davis},
  keywords = {parallel I/O, replication, file system, disk mirroring, disk
  shadowing, pario-bib},
  comment = {A look at shadowed disks. If you have $k$ disks set up to read
  from the disk with the shortest seek, but write to all disks, you have
  increased reliability, read time like the min of the seeks, and write time
  like the max of the seeks. It appears that with increasing $k$ you can get
  good performance. But this paper clearly shows, since writes move all disk
  heads to the same location, that the effective value of $k$ is actually quite
  low. Only 4--10 disks are likely to be useful for most traffic loads.}
}