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By Jon Tate; International Business Machines Corporation. International Technical Support Organization.; et al

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Secure transactions and data transfer. This is a security and integrity requirement aiming to guarantee that data from one application or system does not become overlaid or corrupted by other applications or systems. Authorization also require the ability to fence off one system’s data to other systems. 28 Introduction to SAN • 24x7 response and availability. This is an availability requirement that implies both protection against media failure, possibly using RAID technologies, as well as ease of data migration between devices without interrupting application processing.

Data and storage security and manageability. N ew Era 1980-90s intelligent co ntroller 1970-80s c ontroller storage server N etw orked M odel G lobal data access B roader m anagem ent C lient/S erver M odel D istributed data M anagem ent challenges D edicated M odel Centralized m anagem ent Figure 14. Evolutions in Storage Architecture Figure 14 on page 38 illustrates the evolution of storage architecture in relation to era or phase of computing, from the centralized computing with controller-based dedicated storage, to the Client/Server model with distributed data, and finally to the current networked era calling with its requirement for universal access to data, robust software tools, and data management solutions.

Different Data formats, such as Extended Count Key Data (ECKD), blocks, clusters, and sectors. • Different file systems, such as Virtual Storage Access Method (VSAM), Journal File System (JFS), Andrew File System (AFS), and Windows NT File System (NTFS). SAN Servers and Storage 41 • OS/400, with the concept of single-level storage. • Different file system structures, such as catalogs and directories. CCC and DIR/Xxx/Yyy. • Different data encoding techniques, such as EBCDIC, ASCII, floating point, and little or big endian.

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