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https://kerneltalks.com/troubleshooting/mount-nfs-requested-nfs-version-or-transport-protocol-is-not-supported/
Oct 16, 2017 · Removing hash from RPCNFSDARGS lines will turn off specific version support.This way clients with mentioned nfs version wont be able to connect to NFS server for mounting share. If you have any of it enabled, try disabling it and mounting at client after NFS server service restart.
https://access.redhat.com/solutions/28211
We are facing the same issue, When we copy some data to NFS mount on client, systems gets hung. Didnt find any packets loss, and after copy done system gets back to normal.
https://en.wikipedia.org/wiki/Network_File_System
Network File System (NFS) is a distributed file system protocol originally developed by Sun Microsystems (Sun) in 1984, allowing a user on a client computer to access files over a computer network much like local storage is accessed. NFS, like many other protocols, builds on the Open Network Computing Remote Procedure Call (ONC RPC) system. The NFS is an open standard defined in a …
https://www.thegeekdiary.com/mount-nfs-access-denied-by-server-while-mounting-how-to-resolve/
Then try to mount the NFS share directory. If specifying the NFS client in /etc/exports by domain or hostname ensure the domain name maps to the correct IP, an incorrect entry in /etc/hosts for example could cause access to be denied.. 4.
https://tools.ietf.org/html/rfc1813
RFC 1813 NFS Version 3 Protocol June 1995 Although RPC/XDR compilers exist to generate client and server stubs from RPC Data Description Language input, NFS implementations do not require their use. Any software that provides equivalent encoding and decoding to the canonical network order of data defined by XDR can be used to interoperate with other NFS implementations.
https://linux.die.net/man/5/nfs
NFS is an Internet Standard protocol created by Sun Microsystems in 1984. NFS was developed to allow file sharing between systems residing on a local area network.
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/storage_administration_guide/nfs-serverconfig
Every file system being exported to remote users with NFS, as well as the access level for those file systems, are listed in the /etc/exports file. When the nfs service starts, the /usr/sbin/exportfs command launches and reads this file, passes control to rpc.mountd (if NFSv3) for the actual mounting process, then to rpc.nfsd where the file systems are then available to remote users.
http://nfs.sourceforge.net/nfs-howto/ar01s05.html
The mount command options rsize and wsize specify the size of the chunks of data that the client and server pass back and forth to each other. If no rsize and wsize options are specified, the default varies by which version of NFS we are using. The most common default is 4K (4096 bytes), although for TCP-based mounts in 2.2 kernels, and for all mounts beginning with 2.4 kernels, the server ...
https://linuxize.com/post/how-to-install-and-configure-an-nfs-server-on-centos-8/
Oct 13, 2019 · In this tutorial, you'll go through the steps necessary to set up an NFSv4 Server on CentOS 8. We'll also show you how to mount an NFS file system on the client.
https://serverfault.com/questions/377170/which-ports-do-i-need-to-open-in-the-firewall-to-use-nfs
$ rpcinfo -p grep nfs Port 111 (TCP and UDP) and 2049 (TCP and UDP) for the NFS server. There are also ports for Cluster and client status (Port 1110 TCP for the former, and 1110 UDP for the latter) as well as a port for the NFS lock manager (Port 4045 TCP and UDP).
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