12 - Chapter 12 Vocab 1. logical record, physical record 2....

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Vocab 1. logical record, physical record 2. logical records, physical record 3. close operation 4. file open 5. undelete 6. file migration 7. transaction logging 8. file control, storage control 9. complete path, relative path 10. tree, graph 11. file allocation table (FAT) 12. fault tolerance, RAID 13. storage or FAT 14. son, father, grandfather 15. striping 16. SAN (storage area nework) 17. NAS (network attached storage) Review 1. The command layer or application program provides command-layer functions and utility programs for users to manage files, directories, and secondary storage devices. The file control layer is the service-layer interface to the file system. It processes service calls from the command layer or application program and issues commands to the storage I/O control layer to interact with hardware. It also maintains the directory and storage allocation data structures used to find files and their physical storage locations. The storage I/O control layer is the part of the kernel that accesses storage locations and manages data movement between storage devices and memory; it includes device drivers, interrupt handlers, buffers, and cache managers. Secondary storage devices physically store bits, bytes, and blocks in a storage medium, and storage device controllers interact with the bus and OS device drivers to transfer data between storage devices and memory. 1.A file’s logical structure is composed of records and fields organized so that access by a program is as easy as possible. A file’s physical structure depends on the method of physical storage allocation and the physical characteristics of devices containing the file. The two rarely match, so translation between them is necessary. Application programs are simplified because of their lack of interaction with the physical file structure. They need no knowledge of storage allocation issues and no programming that depends on them. 2.Typical file types include text or unformatted binary data, executable programs, and OS
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This note was uploaded on 12/04/2011 for the course INFORMATIO 310 taught by Professor Redd during the Spring '11 term at Art Inst. Phoenix.

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12 - Chapter 12 Vocab 1. logical record, physical record 2....

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