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Abstract RAID storage systems have been in use since the early 1990’s. Recently, however, as the demand for huge amounts of on-line storage has increased, RAID has once again come into focus. This report reviews the history of RAID, as well as where and how RAID systems flt in the storage hierarchy of an Enterprize Computing System (EIS). We descri...
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... Replication is the only erasure code which has multiple copies of an information object. This strategy corresponds to n = 1 and m ≥ 1. RAID level 5 is based on single error correcting codes (ECC), i. e., erasure codes with exactly one checksum fragment, which corresponds to n > 1 and m = 1 [12], while Reed-Solomon can be based on any number of fragments n ≥ 1 and m ≥ 1. In mobile computing and peer-to-peer networks, replication is a very popular strategy for achieving persistency . ...
... In contrast to simple replication strategies [16], in IRMA the information is stored fully distributed without any replica- tion. Available mechanisms for organizing distributed information storage and for recovering lost data are erasure codes such as RAID [12], or Reed-Solomon [13, 14], which were traditionally used in the context of redundant disk arrays in servers. Such disks are placed at well-known locations and controlled by a centralized I/O unit. ...
A novel management layer architecture for mobile grid environments and ad-hoc networks is presented. This pa- per addresses a key challenge in dynamic mobile environ- ments with a high degree of fluctuation in the hardware infrastructure: how to store informationpersistently and at the same time efficiently . Most currently available ap- proaches are based on replication strategies. These strate - gies achieve persistency even in highly dynamic environ- ments, but have to pay a high price for achieving redun- dancy. Our proposed architecture is based on the adap- tation of fault-tolerant data distribution strategies uti lizing erasure codes, such as RAID or Reed-Solomon, and thus combines persistency with high storage efficiency.
A three-tier information management architecture for mobile grid environments and ad-hoc networks is presented in this paper. We address a key challenge in such highly dynamic environments with a high degree of fluctuation in the hardware infrastructure: how to store information consistently, persistently, and at the same time efficiently. Most currently available approaches are based on replication strategies. These strategies achieve persistency even in highly dynamic environments, but have to pay a high price in terms of redundancy. Our proposed architecture is based on the adaptation of fault-tolerant data distribution strategies utilizing erasure codes, such as RAID or Reed-Solomon, and thus combines consistency and persistency with high storage efficiency.
