@InProceedings{wilkes:autoraid-sosp,
  author = {John Wilkes and Richard Golding and Carl Staelin and Tim Sullivan},
  title = {The {HP AutoRAID} Hierarchical Storage System},
  booktitle = {Proceedings of the Fifteenth ACM Symposium on Operating Systems
  Principles},
  year = {1995},
  month = {December},
  pages = {96--108},
  publisher = {ACM Press},
  address = {Copper Mountain, CO},
  later = {wilkes:autoraid},
  URL =
  {http://www.hpl.hp.com/personal/John_Wilkes/papers/AutoRAID.SOSP95.ps.Z},
  keywords = {RAID, disk array, parallel I/O, pario-bib},
  comment = {Cite wilkes:autoraid. A commercial RAID box that transparently
  manages a hierarchy of two RAID systems, a RAID-1 mirrored system and a
  RAID-5 system. The goal is easy-to-use high performance, and they appear to
  have achieved that goal. Data in current use are kept in the RAID-1, and
  other data in RAID-5. This design gives performance of RAID-1 with cost of
  RAID-5. They have a clever scheme for spreading both RAIDs across most disks,
  including a hot spare. Dual controllers, power supplies, fans, etc. The
  design is a fairly standard RAID hardware controller, using standard SCSI
  disks, but with all the new tricks done in controller software. The paper
  gives a few results from the prototype hardware, and a lot of simulation
  results.}
}