Consider a distributed file system that uses per-user name spaces. In other words, each user has his own, private name space. Can names from such name spaces be used to share resources between two different users?
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- Write a program that scans all directories in a UNIX file system and finds and locates all i-nodes with a hard link count of two or more. For each such file, it lists together all file names that point to a file. Explain the key steps in your code and suggest one alternative approach.Write a C program that scans all directories in a UNIX file system and finds and locates all i-nodes with a hard link count of two or more. For each such file, it lists together all file names that point to a file. Explain the key steps in your code and suggest one alternative approach.For example, Computer A can communicate with computer C by using TELNET. At the same time, computer A communicates with computer B by using the File Transfer Protocol (FTP). For these processes to receive data simultaneously, we need a method to label the different processes. Could you explain that method?
- Take, for instance, an airline database using a technique called "snapshot isolation." If the airline's overall performance improves, non-serializable executions may be tolerated.Suppose that a disk drive has 6,000 cylinders, numbered 0 to 5999. The drive is currently serving a request at cylinder 3797, and the previous request was at cylinder 1375. The queue of pending requests, in FIFO order, is: 1589, 5474, 2104, 1350, 4336, 3678, 1697, 1780, 3794, 3982, 2508 Starting from the current head position, what is the total distance (in cylinders) that the disk arm moves to satisfy all the pending requests for each of the following disk-scheduling algorithms? Show the calculation result Show the sequence of the position of the head and calculation steps 1. SSTF 2. SCANConsider a distributed system with two sites, A and B. Can site A distinguish among the following? • B goes down. • The link between A and B goes down. • B is extremely overloaded and response time is 100 times longer than normal. What implications does your answer have for recovery in distributed systems?
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- For a system, the resource allocation state is given below: Available = (2 4 1 1) (a) Is this system in a safe state? Justify your answer. (b) If a request from process P0 arrives for (0 2 0 0), can the request be immediately granted? Justify your answerGiven a directory tree of a file system, if /usr/jeff is the working directory, what is the absolute path name for the file whose relative path name is ../ast/z?For this assignment, write a pair of programs, in C or as shell scripts, to send and receive a message. Your programs will: Send and receive a message by a covert channel on a MINIX 3 system. Hint: A permission bit can be seen even when a file is otherwise inaccessible, and the sleep command or system call is guaranteed to delay for a fixed time, set by its argument. Measure the data rate on an idle system. Create an artificially heavy load by starting up numerous different background processes and measure the data rate again.