Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Q. Remapping of bad blocks by sector sparing or else sector slipping could influence performance. Presume that the drive in Subsequent Exercise has a total of 100 bad sectors at random locations and that every bad sector is mapped to a spare that is located on a different track but within the same cylinder. Estimation the number of I/Os per second and the effective transfer rate for a random-access workload consisting of 8-kilobyte reads with a queue length of 1 (that is the choice of scheduling algorithm isn't a factor). What is the consequence of a bad sector on performance?
Answer: Since the disk holds 22,400,000 sectors the probability of requesting one of the 100 remapped sectors is very small. An instance of a worst-case event is that we attempt to read say an 8 KB page however one sector from the middle is defective and has been remapped to the worst possible location on another track in that cylinder. In this situation the time for the retrieval could be 8 ms to seek plus two track switches and two full rotational latencies. It is probable that a modern controller would read all the requested good sectors from the original track before switching to the spare track to retrieve the remapped sector and thus would incur only one track switch and rotational latency. Therefore the time would be 8ms seek + 4.17 ms average rotational latency + 0.05 ms track switch + 8.3 ms rotational latency + 0.83 ms read time (8 KB is 16 sectors 1/10 of a track rotation). Therefore the time to service this request would be 21.8ms giving an I/O rate of 45.9 requests per second as well as an effective bandwidth of 367 KB/s. For a strictly time-constrained application this might matter but the overall impact in the weighted average of 100 remapped sectors and 22.4 million good sectors is nil.
Question: a) The following questions pertain to User and Group accounts in Windows XP: i) Give four differences between a Power User and a Guest User account. ii) Explain h
Question : a) Consider table 1.0 below, assume the processes arrived in the order P 1 , P 2 , P 3 , P 4 at time shown and need the indicated burst time (both in milliseconds)
Define spooling. A spool is a buffer that holds output for a device, like printer, that cannot accept interleaved data streams. When a request finishes printing, the spooling s
Unix process API The two most important function calls to use when programming with several processes are fork and exec: fork() creates a copy of current process. It gives
Q. How does the distinction among kernel mode and user mode function as a rudimentary form of protection (security) system? Answer: The distinction among kernel mode and user m
Q. What are the five main activities of an operating system in regard to process management? Answer: a. The creation as well as deletion of both user and system processes
Explain process scheduling in time sharing The relevant features of time sharing are: 1. Process priorities do not depend on the nature of the processes 2. Proc
Determine what the expansion of nested macro calls follows The expansion of nested macro calls follows the Last in First out (LIFO) rule.
What disadvantages are there to this two-level directory? Without other provisions, two users who require cooperating with each other are hampered in reaching every other's fi
Determine what the “blocking factor” of a file is Blocking factor is the number of logical records in one physical record
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd