A2Ans

# A2Ans - 1 University of Waterloo School of Computer Science...

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- 1 - University of Waterloo School of Computer Science CS348 Spring 2009 Assignment 2 Due: June 2, 2009 20%1. Consider a disk storage system with 40,000 cylinders and with 10 recordable surfaces. Each track on a surface is divided into 80 blocks, and the block size is 2048 bytes. Suppose a sales transaction file has 100,000,000 fixed-length records. Each record has the following attributes: Transaction#(32 bytes), Customer#(12 bytes), SalesLocation#(12 bytes), SalesPersonnel#(12 bytes), Item#(16 bytes), Price (4 bytes) and Quantity(4 bytes). The file is stored on contiguous blocks and as an unspanned file on the disk storage system. You may assume 1MB = 1,000,000 bytes and 1 GB = 1,000 MBs. (a) What is the total capacity of disk storage system (in MB). (5%) The total capacity is 40,000*10*80*2048 bytes = 40,000*10*80*2048/1000000=65536 MB. (b) Calculate the blocking factor, that is, how many records can be fitted into a block, assuming that no record can span two or more blocks, and we try to place

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A2Ans - 1 University of Waterloo School of Computer Science...

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