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Operating Systems Solaris NFS - concurrent write to same file normal ? Post 302967368 by javanoob on Tuesday 23rd of February 2016 08:19:25 AM
Old 02-23-2016
NFS - concurrent write to same file normal ?

Hi all,

Sorry if I sound like a novice , I have always thought that for network file system which can be shared, there will be some access restriction in which

when user A is writing/editing fileA, user B is able to view the same fileA but cannot write/edit it until user A has completed and saved the fileA.

======================

Today, while in Solaris10, I encounter the following

Code:
 
 ServerA:/shareddrive
 ServerB -> mount -F nfs serverA:/shareddrive /shareddrive
 ServerC -> mount -F nfs serverA:/shareddrive /shareddrive
  
 -- shuser user has the same UID across all the 3 servers.
 In Server A -> mkdir sharedfolder; chown shuser:shuser sharedfolder;
 In Server B -> touch filea; vi filea;  insert 'abcd' -- leaving the file open
 In Server C -> vi filea; insert '1234'  
  
 In server B -> :wq!
 In server C -> :wq!
  
 Result filea = 1234

====================

Is this behaviour perfectly normal under NFS ?
Able to edit the same file at the same time, with 1 write overwriting another ? SmilieSmilieSmilie

Regards,
Noob
 

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MOUNT.NFS(8)						      System Manager's Manual						      MOUNT.NFS(8)

NAME
mount.nfs, mount.nfs4 - mount a Network File System SYNOPSIS
mount.nfs remotetarget dir [-rvVwfnsh ] [-o options] DESCRIPTION
mount.nfs is a part of nfs(5) utilities package, which provides NFS client functionality. mount.nfs is meant to be used by the mount(8) command for mounting NFS shares. This subcommand, however, can also be used as a standalone command with limited functionality. mount.nfs4 is used for mounting NFSv4 file system, while mount.nfs is used to mount NFS file systems versions 3 or 2. remotetarget is a server share usually in the form of servername:/path/to/share. dir is the directory on which the file system is to be mounted. OPTIONS
-r Mount file system readonly. -v Be verbose. -V Print version. -w Mount file system read-write. -f Fake mount. Don't actually call the mount system call. -n Do not update /etc/mtab. By default, an entry is created in /etc/mtab for every mounted file system. Use this option to skip making an entry. -s Tolerate sloppy mount options rather than fail. -h Print help message. nfsoptions Refer to nfs(5) or mount(8) manual pages. NOTE
For further information please refer nfs(5) and mount(8) manual pages. FILES
/etc/fstab file system table /etc/mtab table of mounted file systems SEE ALSO
nfs(5), mount(8), AUTHOR
Amit Gud <agud@redhat.com> 5 Jun 2006 MOUNT.NFS(8)
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