November 2001
Intermediate to advanced
320 pages
7h 58m
English
Content preview from IP SANs: A Guide to iSCSI, iFCP, and FCIP Protocols for Storage Area NetworksBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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3.3. Network-Attached Storage
Like the acronym SAN, NAS is largely a marketing term that has, through repeated use, gained a technical definition. The primary distinction between NAS and SAN rests on the difference between data files and data blocks. NAS transports files; SANs transport blocks. NAS uses file-oriented delivery protocols such as NFS and CIFS, whereas SANs use block-oriented delivery protocols such as SCSI-3. Because data blocks are the raw material from which files are formed, NAS also has a block component. These blocks are addressed on a per-file basis, using meta-data (directory information) to determine which file to use. The block access methods of a NAS device, however, are typically hidden in the NAS enclosure. To the outside ...
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