By Thomas C. Jepsen
The global marketplace for SAN and NAS garage is expected to develop from US $2 billion in 1999 to over $25 billion through 2004. As business-to-business and business-to-consumer e-commerce matures, even higher calls for for administration of saved info will come up. With the speedy bring up in info garage specifications within the final decade, effective administration of kept info turns into a need for the enterprise. a up to date UC-Berkeley examine predicts that 150,000 terabytes of disk garage could be shipped in 2003. most monetary, coverage, healthcare, and telecommunications associations are within the strategy of enforcing garage networks which are disbursed to a couple degree. For those associations, facts integrity is important, and they're going to spend a lot time and cash on making plans.
one of many fundamental stumbling blocks to enforcing a garage community pointed out via firm IT managers is a scarcity of data approximately garage networking know-how and the categorical matters enthusiastic about extending a garage zone community (SAN) or community hooked up garage (NAS) over the Metropolitan region Networks (MAN) or instant zone Networks (WAN). disbursed garage Networks : structure, Protocols and administration addresses the "terminology hole" among company community planners and telecommunications engineers, who needs to comprehend the delivery requisites of garage networks in an effort to enforce dispensed garage networks. Jepsen comprehensively presents IT managers, planners, and telecommunications pros with the knowledge they want with the intention to select the applied sciences most fitted for his or her specific surroundings.
A primary source for all community managers, planners and community layout engineers, in addition to telecommunications engineers and engineering, laptop technological know-how, and data expertise scholars.
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Additional info for Distributed Storage Networks: Architecture, Protocols and Management
Thus, System A can access blocks of data on System B’s storage devices as well as its own storage. Likewise, System B can access blocks of data on System A as well as its own storage. Users of either system would be unaware of the actual physical location of their data. Shared access is not problematical if access is for read-only data. If data is to be written or modiﬁed, however, access to the data must be controlled so that only one user is modifying the data at any time, to prevent corruption.
The primary difference between NAS and SAN architecture lies in the fact that NAS serves ﬁle-structured data to clients while SANs serve block-structured data to application servers. However, this neat distinction is blurred somewhat by the fact that the NAS ﬁle manager must manage data at the block level in its own attached storage. The ﬁle manager contains metadata, in the form of directories and data structures, that maps ﬁle requests to blocks of data in disk storage. 10). 10 NAS head architecture.
Once a connection is established, the entire loop bandwidth is dedicated to data transfer between the two connected ports. The arbitration logic includes a fairness algorithm to prevent any two nodes from monopolizing access to the loop. 5 Arbitrated loop topology. 6). In a true arbitrated loop topology, failure of a single node will cause the entire loop to become inoperative, since the entire bandwidth passes through each device. The hub contains circuitry to sense device failure, and permit data intended for other nodes to pass through if a node becomes inoperative.