The world's earliest industrial RAID prototype!
RAID and I/O Systems project, part of the Storage Systems and Servers
department, has made many fundamental contributions in the areas of
I/O (storage) subsystems and RAID technology. These contributions
have resulted in significant advancements to the architecture, algorithms
and practical implementation of I/O and RAID technology in the industry;
they have had an impact on every significant IBM RAID product.
Over 7 years
of research, we have published in excess of 20 RAID papers and collectively
hold 20 patents on RAID technology. Our project has invented many
ideas which are widely referenced and cited by the research community;
- distributed sparing
- Cached RAIDs
- fault tolerant RAIDs
- floating parity
- parity sparing
- 2-D parity
- opportunistic rebuild
- EVENODD codes
- hierarchical RAIDs
These algorithms improve
the performance and availability of RAID controllers significantly.
Our group built the first
RAID prototype in IBM and the industry (contemporaneous with the
Berkeley RAID prototype). This prototype, called Hagar, was the
first to use ideas like non-volatile caching and fault-tolerant
design, now routinely used in RAID designs.
We have made significant
contributions to products such as the IBM RAMAC and the IBM 9337
RAID products, which have been commercial successes. We have also
done significant research, invention and analysis of a newer form
of RAID which includes compression called log-structured RAID.
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