Consider a magnetic disk consisting of 16 heads and 400 cylinders. This disk has four 100-cylinder zones with the cylinders in different zones containing 160, 200, 240. And 280 sectors, respectively. Assume that each sector contains 512 bytes, average seek time between adjacent cylinders is 1 msec, and the disk rotates at 7200 RPM. Calculate the: disk capacity, optimal track skew, maximum data transfer rate
(A)Consider the following scheme to reduce message traffic in distributed deadlock
detection. Transactions are assigned unique priorities, and an antagonistic conflict occurs
when a transaction waits for a data object that is locked by a lower priority transaction.
Deadlock detection is initiated only when an antagonistic conflict occurs. When a waiting
transaction receives a probe that is initiated by a lower priority transaction, the probe is
discarded
(i) Determine the number of messages exchanged to detect a deadlock in the ‘best’ case.
(ii) Determine the number of messages exchanged to detect a deadlock in the ‘average’
case.
(iii) Determine the number of messages exchanged to detect a deadlock in the ‘worst-
case’
(iv) Determine the saving (in percentage) in the average number of messages exchanged
under this message traffic reduction scheme as compared to when no such is used
(B) Why does the interrupt disable method to achieve mutual exclusion not work for
multiprocessor systems?
(C) Consider a magnetic disk consisting of 16 heads and 400 cylinders. This disk has four
100-cylinder zones with the cylinders in different zones containing 160, 200, 240.
And 280 sectors, respectively. Assume that each sector contains 512 bytes, average
seek time between adjacent cylinders is 1 msec, and the disk rotates at 7200 RPM.
Calculate the: disk capacity, optimal track skew, maximum data transfer rate
Trending now
This is a popular solution!
Step by step
Solved in 2 steps
