Nfsvers=2 or nfsvers=3 — Specifies which version of the NFS protocol to use. This is useful for hosts that run multiple NFS servers. If no version is specified, NFS uses the highest supported version by the kernel and mount command. This option is not supported with NFSv4 and should not be used.
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Linux Nfs Version
How To Check Nfs Version
fsid=num
— Forces the file handle and file attributes settings on the wire to be
, instead of a number derived from the major and minor number of the block device on the mounted file system. The valuenum
0
has special meaning when used with NFSv4. NFSv4 has a concept of a root of the overall exported file system. The export point exported withfsid=0
is used as this root.hard
orsoft
— Specifies whether the program using a file via an NFS connection should stop and wait (hard
) for the server to come back online, if the host serving the exported file system is unavailable, or if it should report an error (soft
).Ifhard
is specified, the user cannot terminate the process waiting for the NFS communication to resume unless theintr
option is also specified.Ifsoft
is specified, the user can set an additionaltimeo=
option, where<value>
specifies the number of seconds to pass before the error is reported.<value>
intr
— Allows NFS requests to be interrupted if the server goes down or cannot be reached.nfsvers=2
ornfsvers=3
— Specifies which version of the NFS protocol to use. This is useful for hosts that run multiple NFS servers. If no version is specified, NFS uses the highest supported version by the kernel andmount
command. This option is not supported with NFSv4 and should not be used.noacl
— Turns off all ACL processing. This may be needed when interfacing with older versions of Red Hat Enterprise Linux, Red Hat Linux, or Solaris, since the most recent ACL technology is not compatible with older systems.nolock
— Disables file locking. This setting is occasionally required when connecting to older NFS servers.noexec
— Prevents execution of binaries on mounted file systems. This is useful if the system is mounting a non-Linux file system via NFS containing incompatible binaries.nosuid
— Disables set-user-identifier or set-group-identifier bits. This prevents remote users from gaining higher privileges by running a setuid program.port=num
— Specifies the numeric value of the NFS server port. If
isnum
0
(the default), thenmount
queries the remote host's portmapper for the port number to use. If the remote host's NFS daemon is not registered with its portmapper, the standard NFS port number of TCP 2049 is used instead.rsize=num
andwsize=num
— These settings speed up NFS communication for reads (rsize
) and writes (wsize
) by setting a larger data block size, in bytes, to be transferred at one time. Be careful when changing these values; some older Linux kernels and network cards do not work well with larger block sizes. For NFSv2 or NFSv3, the default values for both parameters is set to 8192. For NFSv4, the default values for both parameters is set to 32768.sec=mode
— Specifies the type of security to utilize when authenticating an NFS connection.sec=sys
is the default setting, which uses local UNIX UIDs and GIDs by means of AUTH_SYS to authenticate NFS operations.sec=krb5
uses Kerberos V5 instead of local UNIX UIDs and GIDs to authenticate users.sec=krb5i
uses Kerberos V5 for user authentication and performs integrity checking of NFS operations using secure checksums to prevent data tampering.sec=krb5p
uses Kerberos V5 for user authentication, integrity checking, and encrypts NFS traffic to prevent traffic sniffing. This is the most secure setting, but it also has the most performance overhead involved.tcp
— Specifies for the NFS mount to use the TCP protocol.udp
— Specifies for the NFS mount to use the UDP protocol.