– Specify intr if users are not likely to damage critical data by manually interrupting an NFS request. If a hard mount is interruptible, a user may press [CTRL]-C or issue the kill command to interrupt an NFS mount that is hanging indefinitely because a server is down.
What is intr fstab?
3) intr. This allows NFS requests to be interrupted if the server goes down or cannot be reached. Using the intr option is preferred to using the soft option because it is significantly less likely to result in data corruption.
What is NFS background mounting?
The -bg option causes the mount attempts to be run in the background. … The -fg option causes the mount attempt to be run in the foreground. The default is -fg , which is the best selection for file systems that must be available.
What is hard mount and soft mount in NFS?
A hard mount is generally used for block resources like a local disk or SAN. A soft mount is usually used for network file protocols like NFS or CIFS. The advantage of a soft mount is that if your NFS server is unavailable, the kernel will time out the I/O operation after a pre-configured period of time.
What is the role of sync option for NFS server?
Most people use the synchronous option on the NFS server. For synchronous writes, the server replies to NFS clients only when the data has been written to stable storage. … If you want to change the option, you first have to unmount the NFS filesystem, change the option, then remount the filesystem.
What are the main features of NFS?
Features of the NFS Service
- NFS Version 2 Protocol. Version 2 was the first version of the NFS protocol in wide use. …
- NFS ACL Support. Access control list (ACL) support was added in the Solaris 2.5 release. …
- NFS Over TCP. …
- Network Lock Manager and NFS. …
- NFS Large File Support. …
- NFS Client Failover. …
- Kerberos Support for the NFS Service. …
- WebNFS Support.
What are 2 NFS mount options?
Common NFS mount options in Linux
- rw (read/write) / ro (read-only) – Use rw for data that users need to modify. …
- suid / nosuid. …
- hard / soft. …
- intr / nointr. …
- fg (foreground) / bg (background) …
- devs / nodevs. …
- timeo=n. …
What is Nolock in NFS?
The nolock option prevents the exchange of file lock information between the NFS server and this NFS client. … If another host accesses the same files as your application on this host, there may be problems if file lock information exchange is disabled.
How do you mount with options?
Mount options for affs
Set the owner and group of the root of the filesystem (default: uid=gid=0, but with option uid or gid without specified value, the uid and gid of the current process are taken). Set the owner and group of all files. Set the mode of all files to value & 0777 disregarding the original permissions.
What are the default share options used by NFS?
defaults use default options: rw, suid, dev, exec, auto, nouser, and async. This defines the settings for the defaults keyword. NFS has its own (additional) set of defaults that are implied unless you tell it otherwise. An example of this is hard vs soft , where hard is the implied value unless you specify soft .
What are soft mounts?
“A soft mount is a lesser-known type of taxidermy where the animal’s head is mounted traditionally on a hard foam form while the body and legs contain a soft filler, usually poly-fil. This makes the finished mount soft and floppy”.
What is the difference between hard mount and soft mount washers?
Hard-mount washers require thick, reinforced concrete foundations, hole drilling and bolt-down. Soft-mount washers slide easily into place without need for these things. … Hard-mount washers require 18-inch clearances between them; soft-mount washers only need only a half inch.
What is soft mounting in DS?
1) Soft Mount
Suppose you have mounted a NFS filesystem using soft mount . When a program or application requests a file from the NFS filesystem, NFS client daemons will try to retrieve the data from the NFS server. … The advantage of this mechanism is fast responsiveness as it doesn’t wait for the NFS server to respond.
Why do we need NFS?
A significant advantage of NFS is that it allows for central management, decreasing the need for added software and disk space on individual user systems. NFS is user-friendly, allowing users to access files on remote hosts in the same way they access local files.
When should I use NFS?
In a closed network (where you know every device), NFS is a fine choice. With a good network, throughput it disgustingly fast and at the same time less CPU intensive on the server. It’s very simple to set up and you can toggle readonly on shares you don’t need to be writeable.
How does NFS work?
All versions of NFS can use Transmission Control Protocol (TCP) running over an IP network, with NFSv4 requiring it. NFSv2 and NFSv3 can use the User Datagram Protocol (UDP) running over an IP network to provide a stateless network connection between the client and server.