Suppose you have a 100GB database housed on a disk array that supports a transfe

Question

Suppose you have a 100GB database housed on a disk array that supports a transfer rate of 60MBps and a tape drive that supports 200GB cartridges with a transfer rate of 80MB per second. How long will it take to back up the database? What is the transfer time if 2:1 compression is possible?

Suppose you have a 100GB database housed on a disk array that supports a transfer rate of 60MBps and a tape drive that supports 200GB cartridges with a transfer rate of 80MB per second. How long will it take to back up the database? What is the transfer time if 2:1 compression is possible?

Explanation / Answer

Time required T = (100*1024)/60 = 102400/60 sec

Time with a compression ratio 2:1 = (100*1024)/(60*2) = 102400/120 sec

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