Nfs Mount Options
I know what each option does but I cannot find anywhere why these two options may not be combined. No guaranty it will work though. In this example, the share below will be available via “/media/username/nfs/sharename”. If the node, object, and mount point are the same as those for a top-most mount, but the remount options are different, the remount operation modifies the mount options of an existing mount. Use this procedure to automatically mount to NFS on a Linux client when your system starts up. The mount utility is available only if Client for NFS is installed. We were getting huge performance impact with noac option and the 1GB files takes about 4-5 minutes over a 1Gb Network NFS mount. The script is intended to run as a daemon (an upstart job script is provided for Ubuntu), and it reads its configuration from /etc/nfs-automount. 00 You can refer the man page of mount_nfs(1M) on HP-UX 11. This may be done any time during client operations. This option is on by default. This is confusing. For example, to make the NFS share asynchronous:. Mounting manually. Neither of these fields may contain spaces. We use the following command but fail to boot. mount_rootonly is on. The NFS client managed to mount the Kerberised NFS share with no issues at all. Technical Report Oracle Databases on ONTAP Jeffrey Steiner, NetApp December 2018 | TR-3633 Important Consult the Interoperability Matrix Tool (IMT) to determine whether the environment,. Here is a comparison of the syntax for each flag. 1 mount: While working on a recent scenario on NFS V4. Third, create the file auto. The main purpose of this protocol is sharing file/file system over the network between two UNIX/Linux machines. It astounds me that even though NFS is Sun's stuff and is a standard, every NFS client out there has a potpourri of mount options. The magic (to me) that these mount options bring is that if a network share or an external drive that is being called via /etc/fstab is not present, they save your machine from hanging for a minute or two during the boot process. IndirectSend This is a debugging option. conf: nfs_client_enable="YES" Then, run this command on each NFS client: # service nfsclient start. The output from showmount is designed to appear as though it were processed through ''sort -u''. Hence the recommended settings are hard and intr options. Make sure the user doing the NFS mount isn't in too many groups. 5 or higher. When you mount the exported aufs from your NFS client, you will need to some NFS options like v3 or nfsvers=3, especially if it is nfsroot. The next step is to mount the directories on a Linux box, and point it to the NFS Shares that were created. CAn you drop this branch (just. tburschka opened this issue Feb 16, 2014 · 21 comments mount. Does this string get included in the mount flags for the NFS SR or is this a set of custom attributes for XenServer?. In both cases, multiple options are separated by commas and must not contain any whitespace characters. Use the below command :. 04 p2 x64 and I am having trouble mounting an NFS share on my Ubuntu 12. Any data access to will go through the NFS cache unless the file is opened for direct I/O or if a write I/O is performed. sudo apt-get install nfs-common nfs-server -y. However, one must first set up the share on Qnap, and then enable NFS access to it as a share option, and ensure that its details are set correct (no_root_squash, or whatever), then create the local directory for the mount point, then do the above mount command. com:/shares /mnt/nfs [/code] to /etc/rc. cifs command has many options. This is the entry I have in my /etc/exports file on the nfs server. If the node, object, and mount point are the same as those for a top-most mount, but the remount options are different, the remount operation modifies the mount options of an existing mount. The main reason for discussing this is that, most of the options are not enabled until the client specifies it with an explicit argument during the mount. tburschka opened this issue Feb 16, 2014 · 21 comments mount. 20:/mnt/nfs /tmp mount. This module is aimed at environments with central file servers that a user wishes to mount on login and unmount on logout, such as (semi-)diskless stations where many users can logon and where statically mounting the entire /home from a server is a security risk, or listing all possible volumes in /etc. Here is a comparison of the syntax for each flag. Loading Index. [[email protected]
:/. This page REALLY is just for me to remember. Mount options for coherent None. Install NFS client support in Ubuntu. Mounting on demand. Note that these options completely override the default arguments that are added by Vagrant automatically. Allow subdirectories below the path(s) to be mounted. But when I mount the network share it. password. The backend can also test if. 1] and Netapp doc ID: What are the mount options for databases on NetApp NFS?. This will leave the VM to hang and wait for the share to come back online. By sharing a folder using the NFS protocol, Linux users can map that share on their systems and use it as a central location for their documents. But how do you mount an NFS share of a UNIX system from a Windows 10 machine? Keep reading to find out how. Create a target directory for your mount point, and execute the following command adjusted with the NFS server IP and the mount. 2) $ grep nfsclient /proc/mounts. 4, "Common NFS Mount Options" for details). Hi Cruisen, Thank you for your comment, the filesystem to be backed up are NFS filesystems, now customer wants to backup these nfs filesystems mount points to the NetBackup appliance i. Hi, Thanks alot for the information. Filesystem types are listed in the ``Filesystem types'' section of this manual page. What does the 11. When mounting a NFS share on Ubuntu (and probably Debian) for the first. To export a filesystem using krb5, export it to the special client named "gss/krb5". If you select the Use custom option, you can limit access by mapping root users or all users to a specific user and group ID. 3 The NFS Client in the 2. This article describes the best practices and recommendations for client-side settings and mount options when using the NFS protocol to connect to an Isilon cluster. You must first unmount the existing file system with the UMOUNT command. Tag: mount Tips on ‘mount options" on NFS version 4. There are four classes of mount options for nfs and nfs4 file systems. If the node, object, and mount point are the same as those for a top-most mount, but the remount options are different, the remount operation modifies the mount options of an existing mount. 4, "Common NFS Mount Options" for details). Mounting NFS resources with the mount command. Initially, we define the NFS mount points as suggested by Oracle. Kevin Closson you don't say much about what kind of backup this is or how it is failing or what the NFS is (NAS or just some NFS mount from another AIX server), and you don't provide the full NFS mount options either. Some of these options can have a positive impact on performance, while others can have a d ramatically negative effect. [2006-06-28 10:29 UTC] [email protected]
iSCSI and it would seem that NFS has some pretty good advantages over iSCSI. Generally, these are servers with a very large hard disk capacity, whose file systems are mounted by other clients. defaults - Use default settings. (I can Ping the RedHat linux) Thnx for your. 1, there are no particular access requirements to virtual directories , but all relative objects have the relevant security checks applied,. WRONG MOUNT OPTIONS AIX (Doc ID 420582. IP hash failover enabled at the ESXi host. Scenario In this how-to, I will be using two systems which are running with […]. IndirectSend This is a debugging option. 1, we came across some intresting scenarios for mounting the NFS volumes on the Unix NFS clients. However, you must be a privileged user to use mount. You can use NFS volumes to store and boot virtual machines in the same way that you use VMFS datastores. To ensure that the saved mount options are not erased during a remount, specify either the local mount directory, or the server hostname and export pathname, but not both, during a remount. In this example server. If you select the Use custom option, you can limit access by mapping root users or all users to a specific user and group ID. Does this string get included in the mount flags for the NFS SR or is this a set of custom attributes for XenServer?. If experiencing any issues with the mount failing due to the network not being up/available, enable NetworkManager-wait-online. The native Linux NLM conflicts with the MapR NFS server. 1 was the first nfs-utils 67 version with support for NFS/RDMA mounts, but for various reasons we 68 recommend using nfs-utils-1. You cannot mount a file system on a directory that is already being used as a mount point. For example, in the case of an NFS mount, device might look like knuth. 5 or higher. 1 mount: While working on a recent scenario on NFS V4. WRONG MOUNT OPTIONS AIX (Doc ID 420582. From the man pages: -O Overlay mount. Replace "krb5" by "krb5i" or "krb5p" for integrity or for privacy, respectively. Start by defining your single NFS mount point as you normally would in /etc/fstab. Managing NFS/NAS Datastores ESXi hosts can access a designated NFS volume located on a NAS (Network Attached Storage) server, can mount the volume, and can use it for its storage needs. If the system does not restrict this access, users with unprivileged access to the local system may be able to acquire privileged access by executing setuid or setgid files located on the mounted NFS file. Mounting NFS FS via autofs with options. A top-most mount does not have another mount on top of it. Can be overridden by the "vers=" NFS mount option. However, you must be a privileged user to use mount. See fsattr(5) for a description of extended attributes. The full set of mount options used by an invocation of mount is determined by first extracting the mount options for the filesystem from the fstab table, then applying any options specified by the -o argument, and finally applying a -r or -w option, when present. For a complete list of options, refer to the mount_nfs(1M) man page. Is there a specific sshd config file entry that prevents passless key login if sshd is not running in debug mode or when the OpenNebula NFS share is mounted? Again, in debug, SSHD works fine with or without the NFS mount on the worker mdskvm-p01. yum install -y nfs-utils Check NFS Share. NFS servers will often map UID 0 (root) to another user such as "nobody" or "nfsnobody". To enable NFS auditing, enter the following command: options cifs. home with the following line: * -fstype=nfs tree:/home/&. 1) Last updated on FEBRUARY 19, 2019 ORA-27054: NFS file system where the file is created or resides is not mounted with. Enabling the nosuid mount option prevents the system from granting owner or group owner privileges to programs with the suid or sgid bit set. Discussion of Individual NFS Mount Options. Learn what is VMFS and NFS and the difference between VMware VMFS and NFS Datastores. This article provides step-by-step instructions on how to access NFS shares from Windows. Not PHP problem. Fix this: All four classes of options are specified as normal NFS mount options because there is only one way to specify mount options in the /etc/fstab file. ls -l / | grep ricky will show you the permissions on the directory you are trying to mount onto. This should return the exports list for this system and should list the folder you just shared – Next step is to check the. 6 kernel is support for the latest version of the NFS protocol, version 4. Supported mount options include the NFS version, the port number, read/write block sizes, and the protocol (TCP or UDP). Red Hat 5/6 when I do mount it says type nfs, I would like to know how to determine version if it isn't listed in mount options or fstab. 6 kernel appeared and became stable enough to be deployed in production environments. This is because file system is mounted as read only. I assume because they are hard mounting. The NFS exports configuration has the following syntax /directories/to/share (nfs options) (nfs options). The next step is to mount the directories on a Linux box, and point it to the NFS Shares that were created. If experiencing any issues with the mount failing due to the network not being up/available, enable NetworkManager-wait-online. How to mount NFS(Network File System) on a Local Ubuntu? Ans : As Ubuntu will not install most of the tools by default. So let's begin this with some mount command options, that can be used to tune NFS performance, primarily from the client side. I don't want nautilus to show my NFS share as "umountable" when only root can umount it Auto mount remote NTFS drive on Choosing a Backup Generator Plus 3 LEGAL House Connection Options. 6 kernel appeared and became stable enough to be deployed in production environments. To list partitions with filesystems types, use the “lsblk” command with the “-f” option. As a whole, Linux can be configured to enforce all NFS mounts to use version 3 instead of defaulting to version 4. You need to specify on the NFS server which clients are allowed root access to the mount. 1] and Netapp doc ID: What are the mount options for databases on NetApp NFS?. In this guide, I’ll take you through the installation of NFSv3 and NFSv4 Server on CentOS 7. I'm running 8. Sounds like this issue but not 100% sure. It mainly describes how to correct ORA-01580 and ORA-27054 errors. 2 ADR Mount Options For NFS Mount Points (Doc ID 1367321. nfs: an incorrect mount option was specified I replaced "username=" with "user=" and got the identical error, so I'm specifying the option wrong. It causes all NFS I/O to be queued to a helper world and decreases performance if enabled. How to configure a NFS mounting in fstab? A typical /etc/fstab entry for a NFS mount looks /mnt/HDD1 /media/freenas/ nfs defaults 0 0 The options you supply. -o Options are specified with a -o flag followed by a comma separated string of options. Of course, the share can be manually mounted, using themount command, to acquire the exported filesystem at a particular mount point. The Linux "ro" (Read Only) mount option is used to mount the filesystem read-only. You can use NFS volumes to store and boot virtual machines in the same way that you use VMFS datastores. The NFS storage server needs to have been configured to export a mount point that is accessible to the ESX server on a trusted network. Systems using NFS make the files available to other systems on the network by "exporting" their directories to the network. How to Mount NFS Shares on Debian 9. Red Hat 5/6 when I do mount it says type nfs, I would like to know how to determine version if it isn't listed in mount options or fstab. I have updated MacOSX to 10. The NFS protocol version used in Fedora 14 is identified by the mount options nfsvers or vers. Fix : wrong fs type, bad option, bad superblock error, If you are trying to mount the nfs directory on system and getting this error. Write down all existing options so that you are able to revert to them. Table of Contents. Once you have the NFS server running and configured, mount the NFS share on the client machines. There is no need to modify /etc/fstab. The Linux mount command loads the filesystems of USBs, DVDs, SD cards, and other types of storage devices on a computer running the Linux operating system. To fix this problem, the NFS file handles must be renegotiated. Sometimes, you don't need to mount all network filesystems on boot. This lets you manage storage space in a different location and write to that space from multiple clients. Mount command Block Size Settings to improve NFS performance. Mounting NFS FS via autofs with options. The NFS server is the computer to which the disk is physically attached. Fix this: All four classes of options are specified as normal NFS mount options because there is only one way to specify mount options in the /etc/fstab file. Users on a. In this example server. There are several ways to store your Virtual Machines that run on your VMware Cloud Backend storage. V11 Service Pack 17. How To Mount and Access NFS Exports on Windows Server 2012 R2 few of the options when mounting and NFS share on Windows. These options can be used with manual mount commands, /etc/fstab settings, and autofs. Install DTR using --dtr-storage-volume to reference the Docker volume just created. NFS Only Works in Windows 10 Enterprise. To turn it off, specify insecure. Now see the performance impact by using different options/behavior to cache file attribute on a NFS mount (client side). With few exceptions, NFS-specific options are not able to be modified during a remount. The mount options used were: "rw,bg,hard,rsize=32768,wsize=32768,tcp,vers=3,timeo=600" with the first round, the second round with noac, and the thrid with actimeo=0. Is there a specific sshd config file entry that prevents passless key login if sshd is not running in debug mode or when the OpenNebula NFS share is mounted? Again, in debug, SSHD works fine with or without the NFS mount on the worker mdskvm-p01. This article describes the best practices and recommendations for client-side settings and mount options when using the NFS protocol to connect to an Isilon cluster. # If "vers=" is not specified for an NFS mount, this is the version # that will be attempted first. nfs: mount(2): Invalid argument mount. 1 (note the limitations of NFS 4. Assumptions: You know the exact NFS share PATH. Enable mount access to subdirectories. This means NFS 3 on the NFS server system is required. SAP MaxDB Version 7. Mount Options for Oracle files for RAC databases and Clusterware when used with NFS on NAS devices (Doc ID 359515. Unfortunately, this post probably comes way too late for the original poster, but it may be useful for anyone else, like me, who stumbles across this thread looking for a way to mount nfs on Android devices. The following options are available (note that most of the options are duplicates of other mount flags): acl - Use the filesystem's access control lists (ACLs) to implement real POSIX permissions (default). 1] Workaround: Oracle recommends to set the init parameter. Preventing setuid binaries on a world-writable filesystem makes sense because there's a risk of root escalation or other awfulness there. Are there any known workarounds for setting NFS mount options, however hacky?. A 100% free Network File Server (NFS) 2 and 3 compliant software for Windows Xp, Vista, 7 & 8. master file for auto. The magic (to me) that these mount options bring is that if a network share or an external drive that is being called via /etc/fstab is not present, they save your machine from hanging for a minute or two during the boot process. To created NFS mounts on custom servers Whenever an NFS mount is requested on a custom server In general, whenever an NFS mount is created on a custom server box as requested by the owner, it will be set to mount = true or false. StorNext NAS supports all NFS share options. Recommended NFS Mount Options We recommend the following default values for mount options on Linux: rsize=1048576 – Sets the maximum number of bytes of data that the NFS client can receive for each network READ request. local and it worked. To mount a filesystem using krb5, provide the "-osec=krb5" option to mount. Start by defining your single NFS mount point as you normally would in /etc/fstab. Have a handful of LInux clients backing up data over NFS and on occasion or during this process I'll notice the FreeNAS server bog completely down. NFS exists for a long time in Windows, starting with server 2003, and it’s still here in server 2012/R2. Mount options for ncpfs Just like nfs, the ncpfs implementation expects a binary argument (a struct ncp_mount_data) to the mount system call. It is analogous to the server Message Block (SMB) and Common Internet File System (CIFS) protocols on Microsoft Windows. As a whole, Linux can be configured to enforce all NFS mounts to use version 3 instead of defaulting to version 4. With Windows NFS clients, use the -o nolock option on the NFS server to prevent the Linux NLM from registering with the portmapper. When you try to mount NFS share using mount command, without a client you will get the following errormount -t nfs v-itig41:/var/data /mntmount: wrong fs type, […]. In the implementation of V4. remote NFS mounts should be mounted with the following options: most clients will mount remote NFS file systems with an 8-KB read/write block size; the. nfs: an incorrect mount option was specified. NFS Client Configuration Files. 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. For instance wsize=32768. home with the following line: * -fstype=nfs tree:/home/&. New users should try --mount syntax which is simpler than --volume syntax. Bind mounts provide a way to specify just one NFS mount and then bind the default GitLab data locations to the NFS mount. Hi All, I've been using the same configuration for CentOS 5 and 6 where I have to NFS shares that mount on startup in /etc/fstab. Hard Mount: A Hard mount is generally used for block resources like a local disk or SAN. Users can stream data directly to HDFS through the mount point. 1) What I'm after is some feedback from someone who's used NFS mounts for single instance Oracle 12 to make sure we reconfigure our mounts correctly. This document shows how to install a minimal Cygwin enviroment to host an NFS server. To mount NFS resources, do the following:. * NFS mount option “forcedirectio” is required on Solaris platforms when mounting the OCR/CRS files when using Oracle 10. You will need to create a suitable directory somewhere to mount the share - please don't create it under "/media/" … Mount options … 3. The server that is exporting the filesystems is an HP-UX 11. network file system -read by the NFS mount. I then removed nfs-utils packages. It is possible to indicate a block special device using its volume label or UUID (see the -L and -U options below). 1 for FT or SIOC). NFS Share Options. 5 Using Red Hat Client with NetApp Storage over NFS 2. I selected the rsize=2048 and wsize=2048 option for this NFS mount based on some testing I did with copying 90MB worth of files over the network to the client with different rsize settings. I have a Qnap myself which also is limited to the same speed you see. Direct NFS is built directly into the database kernel - just like ASM which is mainly used when using DAS or SAN storage. Explain why this mapping is a security risk. # The default is 2. Now mounting from fstab is working using command mount -a, but not at boot. i have tried to remove "-o nolock" option, but it still has problem like this: [email protected]
:~# mount -t nfs 192. Third, create the file auto. On AIX, I simply type "mount" and see the mount option… For some reasons, my Linux does not show me the complete mount options ! $ mount precision:/nfsserver on /nfsclient type nfs (rw,bg,addr=127. 6 kernel appeared and became stable enough to be deployed in production environments. This post shows results of three mount options used and backup time for a single tablespace (size 16GB) using RMAN. Expdp or rman on an NFS mount point in AIX This document describes how to do datapump exports and rman backups on NFS mount points on AIX. > > So far I found that the *client* side problem is likely caused (it was in my > case) by a lack of CONFIG_NFS_V4_2=y in the kernel; adding that and > rebooting made automounting with 1. Recommended NFS mount options for various UNIX hosts Note: mount options "forcedirectIO" and "noac" are only recommended on databases. Verify the relevant NFS export details. Third, create the file auto. Mounting manually. nfs_data]]] type = nfs mountpoint = /mnt/exports/nfs_data export_path = /mnt/exports/data The export_path is the path on the server, and the mountpoint is the path to mount the share on the client. Equivalent to rw, suid, dev, exec, auto, nouser, async. nfs: an incorrect mount option was specified. These options can be used with manual mount commands, /etc/fstab settings, and autofs. Direct NFS client without requiring any special configuration. Mounting NFS resources with the mount command. If no rsize and wsize options are specified, the default varies by which version of NFS we are using. Scenario In this how-to, I will be using two systems which are running with […]. 23 to know the mount options which are equivalent to 11. It determines the recovery behavior of the NFS client after an NFS request times out. 1)] for these different options. Kernel NFS mount. The regular 'mount' command needs the NFS helpers to be able to mount an NFS share. Network File System (NFS) is a popular distributed filesystem protocol that enables users to mount remote directories on their server. nfs is meant to be used by the mount(8) command for mounting NFS shares. Are there any known workarounds for setting NFS mount options, however hacky?. When mounting a FAT32 partition, I prefer the options as in the following line found in /etc/fstab. WRONG MOUNT OPTIONS AIX (Doc ID 420582. Discussion of Individual NFS Mount Options. See the mount(8) man page for possible options and their meanings. Each line may represent a different nfs share to mount. -o options Options specific to the server doing the mounting. Red Hat 5/6 when I do mount it says type nfs, I would like to know how to determine version if it isn't listed in mount options or fstab. To learn more about available options, take a look at. For example, using defaults on my machine expands to rw,vers=4,addr=nfs_server_ip,clientaddr=nfs_client_addr. Have a handful of LInux clients backing up data over NFS and on occasion or during this process I'll notice the FreeNAS server bog completely down. Add NFS mount options to allow the local caching support to be enabled. defaults - Use default settings. Mount an NFS Filesystem. password. 3 TL04 and higher with Oracle 10. To test if your modified /etc/fstab is working, unmount the shares and run mount -a: umount /mnt/nfs/home/client1 umount /var/www mount -a. We were getting huge performance impact with noac option and the 1GB files takes about 4-5 minutes over a 1Gb Network NFS mount. On a Windows Server 2003 R2-based computer, you map a drive by mounting a Network File System (NFS) share from an NFS server. When a NFS filesystem mount is a Hard mount, an NFS request affecting any part of the mounted resource is issued repeatedly until the request is satisfied. The regular 'mount' command needs the NFS helpers to be able to mount an NFS share. Applies to: Oracle Database - Enterprise Edition - Version 11. NFS allows a linux server to share directories with other UNIX clients over network. 1 mount: While working on a recent scenario on NFS V4. Q:9 How to check iostat of nfs mount points ? Ans: Using command ‘nfsiostat‘ we can list iostat of nfs mount points. To mount NFS resources, do the following:. Hi Carl The TR-3322 that you mentioned in your email is a great start and ha basi fundamentals of NFS protocol but it is rather an outdated one. showmount queries the mount daemon on a remote host for information about the state of the NFS server on that machine. 20:/mnt/nfs /tmp mount. Mount command Block Size Settings to improve NFS performance. These options are stored on disk by the NFS mount subcommand, and can be erased by a remount. To be able to use this, a recent nfsutils package is required. For details, see mount(8) or swapon(8). This one is a generic question on NFS mount settings: ORA-27054: NFS file system where the file is created or resides is not mounted with correct options (Doc ID 781349. These options can be used with manual mount commands, /etc/fstab settings, and autofs. 0 & 11i NFS implementations • Summarize Recommendations There are many NFS-specific mount options available. With the following commands you will mount an SMB share into /mnt/smb and an NFS share …. This option is on by default. Beyond mounting a file system via NFS on a remote host, you can also specify other options at mount time to make the mounted share easier to use. When the backup task tries to trigger (that's all I'm using this mount for) I get this error: TASK ERROR: could not get storage information for 'backups': mount error: mount. This file must contain a number of lines in the following format: directory mapname options Where: directory is the directory to mount an indirect map in, or /- for a direct map mapname is the file which contains the map and options are any standard NFS options which should be used for the entire map. Hi, - changed a bit the mount options in fstab: user, and users (but these are only setting the permissions of who can. It is mainly use for sharing files and folders between unix or linux system or vice-versa. To created NFS mounts on custom servers Whenever an NFS mount is requested on a custom server In general, whenever an NFS mount is created on a custom server box as requested by the owner, it will be set to mount = true or false. The purpose of this document is to outline the file system mount options to use when configuring GoldenGate to run with NFS mounted file system. This example used the soft and nfsvers options; Table 29. NFS Mount options for use with GoldenGate NFS Client OS Mount options for Oracle GoldenGate Files SUN Solaris rw,bg,hard,nointr,rsize=32768,wsize=32768,proto=tcp,. 1) Last updated on MARCH 06, 2019. Network share: Performance differences between NFS & SMB – Create folders inside /mnt (e. In TR-3322 it says that the mount point for the redo logs should have the forcedirectio option on and the mount point for the data files should have it off. It allows you to mount your local file systems over a network and remote hosts to interact with them as they are mounted locally on the same system. I saw it once, I can't find it again. The Busybox's 'mount' can handle NFS filesystem when enabled in its configuration. To enable NFS auditing, enter the following command: options cifs. NFS (Network File System) is basically developed for sharing of files and folders between Linux/Unix systems by Sun Microsystems in 1980. I then removed nfs-utils packages. Mounting NFS Share on Linux. While doing my first install of Oracle RAC on Solaris using NFS as the Clustered Filesystem, I took the opportunity to test the various mount options specified by oracle (Doc ID: Note:359515. This will install all the required packages for nfs client. These options can be used with manual mount commands, /etc/fstab settings, and autofs. The NFS gateway can be on the same host as DataNode, NameNode, or any HDFS client. nfs: an incorrect mount option was specified I replaced "username=" with "user=" and got the identical error, so I'm specifying the option wrong. Mounting and Verifying Exports on the NFS Client. The other option, retrans, specifies the number of tries the NFS client will make to retransmit the packet. The option has to be used with canonical path to the mount point. The Network File System is certainly one of the most widely used network services. Unless the storage device is mounted to the tree structure, the user can't open any of the files on the computer. Then it allows "insecure" port numbers and you don't have to use the "-P" option when mounting and you don't have to "sudo" or be root when mounting.