A consistency checker _________ and tries to fix any inconsistencies it finds.
1.compares the data in the secondary storage with the data in the cache
2. compares the data in the directory structure with the data blocks on disk
3.compares the system generated output and user required output
4.All of the Mentioned
A systems program such as fsck in ______ is a consistency checker.
1.UNIX
2.Windows
3.Macintosh
4.Solaris
A _________ directory is mounted over a directory of a _______ file system.
1.local, remote
2.remote, local
3. local, local
4.none of the mentioned
In UNIX, even an ’empty’ disk has a percentage of its space lost to ______
1.programs
2.inodes
3.virtual memory
4.stacks
The heads of the magnetic disk are attached to a _____ that moves all the heads as a unit.
1.spindle
2. disk arm
3. track
4.None of the mentioned
The set of tracks that are at one arm position make up a _____
1.magnetic disks
2. electrical disks
3.assemblies
4.cylinders
A file being read or written sequentially should not have its pages replaced in LRU order, because _______
1.it is very costly
2. the most recently used page will be used last
3. it is not efficient
4. all of the mentioned
A machine in Network file system (NFS) can be ________
1.client
2.server
3.both client and server
4.neither client nor server
A mount operation includes the ______
1. name of the network
2.name of the remote directory to be mounted
3.name of the server machine storing it
4.All of the Mentioned
A process is moved to wait queue when I/O request is made with _______
1. non-blocking I/O
2.blocking I/O
3.asynchronous I/O
4.synchronous I/O
A server crash and recovery will __________ to a client.
1. be visible
2.affect
3.be invisible
4.harm
A single NFS write procedure _________
1. can be atomic
2.is atomic
3.is non atomic
4. none of the mentioned
All the changes that were done from a transaction that did not commit before the system crashed, have to be _____
1. saved
2. saved and the transaction redone
3.undone
4.None of the mentioned
By preallocating the inodes and spreading them across the volume, we ___________ the system performance.
1.improve
2.decrease
3.maintain
4.do not affect
Device drivers are implemented to interface ______
1.character devices
2.block devices
3.network devices
4.All of the Mentioned
Each set of operations for performing a specific task is a _____
1.program
2.code
3. transaction
4.all of the mentioned
Every NFS request has a _________ allowing the server to determine if a request is duplicated or if any are missing.
1.name
2.transaction
3.sequence number
4.All of the Mentioned
For every pair of component and directory vnode after path name translation ______
1. a single NFS lookup call is used sequentially
2.a single NFS lookup call is used beginning from the last component
3.at least two NFS lookup calls per component are performed
4.a separate NFS lookup call is performed
I/O hardware contains ______
1.Bus
2.Controller
3. I/O port and its registers
4.All of the Mentioned
In the optimized technique for sequential access ___________ removes a page from the buffer as soon as the next page is requested.
1.write ahead
2.read ahead
3.free-behind
4.add-front
In UNIX, the file handle consists of a __________ and _____
1. file-system identifier & an inode number
2.an inode number & FAT
3. a FAT & an inode number
4.a file pointer & FAT
In _______ information is recorded magnetically on platters.
1. magnetic disks
2.electrical disks
3.assemblies
4. cylinders
In ___________ writes, the data is stored in the cache.
1. Asynchronous
2.Regular
3. Synchronous
4.Irregular
Once the changes are written to the log, they are considered to be ________
1. committed
2.aborted
3. completed
4.None of the mentioned
Some directory information is kept in main memory or cache to ______
1.fill up the cache
2. increase free space in secondary storage
3.decrease free space in secondary storage
4.speed up access
The data-in register of I/O port is ______
1.Read by host to get input
2.Read by controller to get input
3.Written by host to send output
4.Written by host to start a command
The device-status table contains ____
1. each I/O device type
2.each I/O device address
3. each I/O device state
4.All of the Mentioned
The device-status table contains ________
1.each I/O device type
2.each I/O device address
3.each I/O device state
4.all of the mentioned
The host sets _____ bit when a command is available for the controller to execute.
1.write
2. status
3.command-ready
4.control
The mount mechanism ________ a transitive property.
1. exhibits
2.does not exhibit
3.may exhibit
4.None of the mentioned
The mount request is mapped to the corresponding __________ and is forwarded to the mount server running on the specific server machine.
1.IPC
2.System
3.CPU
4.RPC
The NFS protocol __________ concurrency control mechanisms.
1.provides
2. does not provide
3.may provide
4.None of the mentioned
The NFS servers _______
1.are stateless
2. save the current state of the request
3.maybe stateless
4.None of the mentioned
The server maintains a/an ________ that specifies local file systems that it exports for mounting, along with names of machines that are permitted to mount them.
1.export list
2.import list
3.sending list
4.receiving list
The server must write all NFS data ________
1.synchronously
2.asynchronously
3.index-wise
4.None of the mentioned
The time taken for the desired sector to rotate to the disk head is called _______
1.positioning time
2.random access time
3.seek time
4.rotational latency
The time taken to move the disk arm to the desired cylinder is called the ______
1.positioning time
2. random access time
3. seek time
4.rotational latency
The _________ becomes the name of the root of the newly mounted directory.
1.root of the previous directory
2.local directory
3. remote directory itself
4.None of the mentioned
What is a circular buffer?
1.writes to the end of its space and then continues at the beginning
2.overwrites older values as it goes
3.all of the mentioned
4.None of the mentioned
When a client has a cascading mount _______ server(s) is/are involved in a path name traversal.
1.at least one
2.more than one
3.more than two
4.more than three
When an entire committed transaction is completed, _______
1. it is stored in the memory
2. it is removed from the log file
3. it is redone
4.None of the mentioned
When hardware is accessed by reading and writing to the specific memory locations, then it is called ______
1.port-mapped I/O
2.controller-mapped I/O
3. bus-mapped I/O
4.None of the mentioned
Which buffer holds the output for a device?
1.spool
2.output
3. status
4.magic
Which hardware triggers some operation after certain programmed count?
1. programmable interval timer
2.interrupt timer
3. programmable timer
4.None of the mentioned
Which one of the following connects high-speed high-bandwidth device to memory subsystem and CPU.
1.Expansion bus
2.PCI bus
3.SCSI bus
4.None of the mentioned
With _______ a requested page and several subsequent pages are read and cached.
1.write ahead
2.read ahead
3.free-behind
4.add-front
_____ tend to represent a major bottleneck in system performance.
1. CPUs
2.Disks
3.Programs
4. I/O
______ mounts, is when a file system can be mounted over another file system, that is remotely mounted, not local.
1.recursive
2. cascading
3.trivial
4.None of the mentioned
_______ in NFS involves the parsing of a path name into separate directory entries – or components.
1.Path parse
2.Path name parse
3.Path name translation
4.Path name parsing
________ writes occur in the order in which the disk subsystem receives them, and the writes are not buffered.
1. Asynchronous
2. Regular
3.Synchronous
4.Irregular