Synchronized Disk Interleaving
IEEE Transactions on Computers
A case for redundant arrays of inexpensive disks (RAID)
SIGMOD '88 Proceedings of the 1988 ACM SIGMOD international conference on Management of data
Floating parity and data disk arrays
Journal of Parallel and Distributed Computing - Special issue on parallel I/O systems
Parity logging overcoming the small write problem in redundant disk arrays
ISCA '93 Proceedings of the 20th annual international symposium on computer architecture
The HP AutoRAID hierarchical storage system
ACM Transactions on Computer Systems (TOCS) - Special issue on operating system principles
DCD—disk caching disk: a new approach for boosting I/O performance
ISCA '96 Proceedings of the 23rd annual international symposium on Computer architecture
Hot mirroring: a method of hiding parity update penalty and degradation during rebuilds for RAID5
SIGMOD '96 Proceedings of the 1996 ACM SIGMOD international conference on Management of data
Virtual log based file systems for a programmable disk
OSDI '99 Proceedings of the third symposium on Operating systems design and implementation
Proceedings of the Second International Conference on Data Engineering
Data Logging: A Method for Efficient Data Updates in Constantly Active RAIDs
ICDE '98 Proceedings of the Fourteenth International Conference on Data Engineering
Implementation and Performance Evaluation of RAPID-Chache under Linux
PDPTA '02 Proceedings of the International Conference on Parallel and Distributed Processing Techniques and Applications - Volume 3
DSN '02 Proceedings of the 2002 International Conference on Dependable Systems and Networks
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RAID has long been established as an effective way to provide highly reliable as well as high-performance disk subsystems. However, reliability in RAID systems comes at the cost of extra disks. In this paper, we describe a mechanism that we have termed RAID0.5 that enables striped disks with very high data reliability but low disk cost. We take advantage of the fact that most disk systems use offline backup systems for disaster recovery. With the use of these offline backup systems, the disk system needs to only replicate data since the last backup, thus drastically reducing the storage space requirement. Though RAID0.5 has the same data loss characteristics of traditional mirroring, the lower storage space comes at the cost of lower availability. Thus, RAID0.5 is a tradeoff between lower disk cost and lower availability while still preserving very high data reliability. We present analytical reliability models and experimental results that demonstrate the enhanced reliability and performance of the proposed RAID0.5 system.