Electrical computers and digital processing systems: memory – Storage accessing and control – Specific memory composition
Reexamination Certificate
2005-11-01
2005-11-01
Lane, Jack (Department: 2188)
Electrical computers and digital processing systems: memory
Storage accessing and control
Specific memory composition
Reexamination Certificate
active
06961815
ABSTRACT:
A disk controller connected to a set of disks in a data storage system is configured to mirror a first class of data on multiple disks while storing a second class of data without mirroring. The controller maintains at least one of the disks containing the first class of data in an operational state while maintaining at least one of the remaining disks in a low power state. The first class of data may contain popular files while the second class of data contains unpopular files. The first data class may be mirrored on each of the disks. The data in the second class may be stored with parity where the parity information is maintained on a single disk. The operational disk may be changed following access to data from the second class of data that is stored on one of the low power state disks.
REFERENCES:
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Sai-Lai Lo, Ivy: A Study on Replicating Data for Performance Improvement, Hewlett Packard Laboratories Technical Report HPL-CSP-90-48, Dec. 14, 1990, Palo Alto, CA.
Rachad Youssef, RAID for Mobile Computers, Master's Thesis, Aug. 1995, Carnegie Mellon University Information Networking Institute.
X. Yu, B. Gum, Y. Chen, R.Y. Wang, K. Li, A. Krishnamurthy, T.E. Anderson, Trading Capacity for Performance in a Disk Array, Proc. Fourth Symposium on Operating Systems Design and Implementation, Oct. 2000.
Kistler Michael David
Rajamony Ramakrishnan
Lally Joseph P.
Lane Jack
Salys Casimer K.
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