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Computer Science, Operating Systems
Year 4
File space
Consider a disk holding files with an average file length of 5 KB. Each file is allocated contiguously on adjacent sectors. To better utilize the disk space, it must be periodically compacted, which involves reading each file sequentially and writing it back to a new location. Assuming the standard sector size of 512, an average seek time of 50 ms, 100 sectors per track, and a rotational speed of 5000 rpm, estimate, how long it will take to move 1000 files~?
By OTA: Vinh (Vincent) Dang, PhD
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- Plain text response
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- The total time associated with moving files.doc
Multiprogrammed systems - In most multiprogrammed systems, user programs access memory through virtual addresses, while the operating systems uses raw physical addresses to access memory. What are the implications of this design on the initiation of I/O operations by the user program and their execution by the operating system?
Please provide a detailed explanation and include all references.
Direct access files - Suppose a direct access file consists of sectors with 1024 byte capacity. Suppose also that records are 32 bytes long. On which logical sector do the following logical records lie? What is the relative record number in the sector?
Logical record 42
Logical record 131
Logical record 32
Logical record 512
process states - Please provide insight regarding the attached diagram and questions. Please provide references. Please explain the concept of process states and how you draw your conclusions for the three questions.
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The following diagram indicates process states. The arrows between the boxes indicate state transitions.
(See attachment for diagram)
a) For each transition, descri...
Adapter Vs CPU - Many of the functions of an adapter(data link or network) related functionality built into network adapter. can be performed in software that runs on the node's CPU. What are advantages and disadvantages of moving this functionality from the adapter to the node?
checksum - Suppose that the information content of a packet is the bit pattern 1111000010100101 and an even parity is being used
a. What would be the checksum field in a single parity bit scheme?
b. What would be the value of the checksum field b for the case of a two-dimensional parity scheme? Your answer should be such that a minimum-length checksum is used.
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