- #1
JackFrank
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need help answering these 2 questions
Q1.
A hypothetical disk drive has the specifications shown below. Find the average access time for a block (sector) of data.
I want the answer in milliseconds, and you need to reduce your answer to a simple final value.
• 32 sectors per track
• 3600 RPM speed
• 7 millisecond average seek time
________________________
Q2.
Transaction processing is chiefly concerned with I/O rate: number of disk accesses per
second, as opposed to data rate, and the I/O speed versus CPU speed in terms of Transactions Per Second (TPS). Assume the following information:
• CPU has the performance of 800 MIPS.
• Each transaction requires 2 disk reads plus 2 disk writes.
• The database software executes 40000 instructions to process a transaction.
• The operating system uses 15000 instructions for each disk read or write access.
• The I/O bus and memory are capable of sustaining 1000 MB/sec of data transfer without interfering with the CPU.
• Each read/write access transfers 100 bytes.
a. What is the peak performance of the CPU in terms of TPS?
b. What is the peak performance of the I/O bus system in terms of TPS?
Thank you in advance.
Q1.
A hypothetical disk drive has the specifications shown below. Find the average access time for a block (sector) of data.
I want the answer in milliseconds, and you need to reduce your answer to a simple final value.
• 32 sectors per track
• 3600 RPM speed
• 7 millisecond average seek time
________________________
Q2.
Transaction processing is chiefly concerned with I/O rate: number of disk accesses per
second, as opposed to data rate, and the I/O speed versus CPU speed in terms of Transactions Per Second (TPS). Assume the following information:
• CPU has the performance of 800 MIPS.
• Each transaction requires 2 disk reads plus 2 disk writes.
• The database software executes 40000 instructions to process a transaction.
• The operating system uses 15000 instructions for each disk read or write access.
• The I/O bus and memory are capable of sustaining 1000 MB/sec of data transfer without interfering with the CPU.
• Each read/write access transfers 100 bytes.
a. What is the peak performance of the CPU in terms of TPS?
b. What is the peak performance of the I/O bus system in terms of TPS?
Thank you in advance.