CS Table, Friday, 30 January 2015: Redundant Arrays of Inexpensive Disks (RAID)

This week in CS table, we will read the first major paper on RAID (not the bug spray, but the disk technology - Redundant Arrays of Inexpensive Disks). This classic paper not only led computer scientists to think differently about storage, but also saw wide adoption in the real world. Copies are available outside Professor Rebelsky's office.

Patterson, D. A., Gibson, G., and Katz, R. H. 1988. A case for redundant arrays of inexpensive disks (RAID). In Proceedings of the 1988 ACM SIGMOD international Conference on Management of Data (Chicago, Illinois, United States, June 01 - 03, 1988). H. Boral and P. Larson, Eds. SIGMOD '88. ACM, New York, NY, 109-116. DOI=https://dl.acm.org/citation.cfm?doid=50202.50214.
Increasing performance of CPUs and memories will be squandered if not matched by a similar performance increase in I/O. While the capacity of Single Large Expensive Disks (SLED) has grown rapidly, the performance improvement of SLED has been modest. Redundant Arrays of Inexpensive Disks (RAID), based on the magnetic disk technology developed for personal computers, offers an attractive alternative to SLED, promising improvements of an order of magnitude in performance, reliability, power consumption, and scalability. This paper introduces five levels of RAIDs, giving their relative cost/performance, and compares RAID to an IBM 3380 and a Fujitsu Super Eagle.

Computer science table is a weekly meeting of Grinnell College community members (students, faculty, staff, etc.) interested in discussing topics related to computing and computer science. CS Table meets Fridays from 12:10-12:50 in the Day PDR (JRC 224A). Contact Sam Rebelsky, rebelsky@grinnell.edu, for the weekly reading. Students on meal plans, faculty, and staff are expected to cover the cost of their meals. Visitors to the College and students not on meal plans can charge their meals to the department.