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- Suppose that you have a UNIX file system where the disk block size is 4096 bytes. Disk addresses and file block pointers take 32 bits (4 bytes), and the i-node contains 12 direct pointers, one single-indirect pointer and one double-indirect pointer. Assume an index block is the same size as a data block (both 4096 Bytes). If there is a file having 50,000 bytes of data and it is never been accessed, we only assume the file's i-node is in memory, but none of the rest of the file. If the user process wants to access to read the entire file into the memory, how many I/O operations would be needed? O a. 15 O b. 12 O c. 14 O d. 13Consider a file system that uses inodes to represent files. Disk blocks are 8 KB in size, and a pointer to a disk block requires 8 bytes. This file system has 12 direct disk blocks, as well as 1 single and 1 double indirect disk blocks. What is the maximum size of a file that can be stored in this file system in GBs (round to the nearest integer)?A disk has a capacity of two tera-byte size. Say the file system uses a multi-level inode structure for locating the data blocks of afile.The inode stores pointers to data blocks, including a single indirect block, a double indirect block, and several direct blocks in the 64 B of available space.Now, it is given that the disk has a block size of 512 B. The maximum file size that can be stored in such a file system in MB (round off upto 2 decimal places).
- Consider a file system that uses contiguous allocation method. For a disk consists of 100 data blocks, each block is 4KB. What is the maximum and minimum number of files of size 15KB can it save? Find the number of files the disk able to support using (1) link allocation and (2) index allocation, assuming the address is 32 bit.Consider a filesystem that uses inodes to represent files. Each inode contains pointers to 12 direct disk blocks, as well as a single and double indirect blocks. Disk blocks are 1KB in size, and a pointer to a disk block requires 4 bytes. If we install this filesystem on a 4TB SSD, we have (select all that apply) the SSD cannot store more than 4 billion files the SSD cannot store more than 1 billion files the SSD at least can store about 650 files the SSD at least can store about 6,500 files none of aboveA file system with 300 GByte uses a file descriptor with 8 direct block address. 1 indirect block address and 1 doubly indirect block address. The size of each disk block is 128 Bytes and the size of each disk block address is 8 Bytes. Find the maximum possible file size in this file system.
- Suppose that a block is 1K Byte and that a disk address is 4 bytes. Suppose that files are implemented using i-nodes, and that an i-node has the following structure: the last address in the inode is a third-level indirect block; the second-to-last address is a second-level indirect block; the third-to-last address is an indirect block; and the remaining addresses are data blocks. Approximately how large a file can this system support?In a main memory-disk virtual storage system, the page size is 1KByte and the OPTIMAL algorithm is used for page replacements. A given program has been allocated three page frames in the main memory and it makes the following 16 memory references when it starts executing (the addresses are given in decimal):500, 2000, 2500, 800, 4000, 1000, 5500, 1500, 2800, 400, 5000, 700, 2100, 3500, 900, 2400 Fill in the contents of the three page frames after each memory reference in a table and calculate the hit ratio. Hint: denote by 'a' the page consisting of locations 0 through 1023 in memory. Similarly, b: 1024-2047, c: 2048-3071, d: 3072-4095, e: 4096-5119 and f: 5120-6143. Round to three decimal places.Suppose that there is a file system with blocks of 512 bytes in size. For each inode, there are 20 direct blocks, 2 singly-indirect blocks, and 2 doubly-indirect blocks. The size of a pointer is 4 bytes. Calculate the maximum possible size of a file in bytes. Show your work.
- . Q: In this problem you are to compare reading a file using a single-threaded file server and a multithreaded server. It takes 15 msec to get a request for work, dispatch it, and do the rest of the necessary processing, assuming that the data needed are in a cache in main memory. If a disk operation is needed, as is the case one-third of the time, an additional 75 msec is required, during which time the thread sleeps. How many requests/sec can the server handle if it is single threaded? If it is multithreaded?Suppose that we have a magnetic disk with the following structure: Each sector is fixed at 512 bytes, and each cluster consists of 4 sectors. Given that a file has reserved 2 clusters with a slack space of 1024 bytes . a- How many sectors will the file will require? b- What will be the physical size of the file? c- What will be the logical size of the file?Consider a file system on a disk that has both logical and physical block sizes of 512 bytes. Assume that the information about each file is al ready in memory. For each of the three allocation strategies (contiguous, linked, and indexed), answer these questions: a. How is the logical-to-physical address mapping accomplished in this system? (For the indexed allocation, assume that a file is always less than 512 blocks long.) b. If we are currently at logical block 10 (the last block accessed was block 10) and want to access logical block 4, how many physical blocks must be read from the disk