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Operating Systems Solaris NFS - concurrent write to same file normal ? Post 302967376 by gull04 on Tuesday 23rd of February 2016 09:03:10 AM
Old 02-23-2016
Hi Javanoob,

There are much more robust solutions, consequentially they are more complex. If you are serious about needing the access and the file level locking spread across multiple servers or shares. I would suggest that you use GFS, I have used it very successfully in the past - with upwards of 15 systems accessing the same disk areas.

However although the systems all functioned as expected, there was an issue where when the utilization of the filesystem got above 80% performance fell away dramatically. These file systems were pretty big (almost 10Tb), so if there was an issue that required an "fsck" the file system was unavailable for a long time (60 hours in one case).

So you have to weigh up the requirements, it may be worth considering something like CVS or similar - where the file has to be checked out and then back in by one user at a time.

Regards

Gull04
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gfsi(5) 							File Formats Manual							   gfsi(5)

Name
       gfsi - The Generic File System Interface

Description
       The  Generic  File  System  Interface (GFSI) is the interface between the kernel and specific file system implementations such as the local
       ULTRIX file system and the Network File System.	The Generic File System Interface has many performance improvements, along with a complete
       reorganization  of  the	file  system code.  The GFS interface has been accomplished with modifications to both the mount table, and to the
       inode, which under the GFS interface implementation is referred to as the gnode.  The gnode is defined in the and

       The GFS interface allows superusers to and file systems on local and remote machines.  Changes to the file allow any type of mount to occur
       automatically  at  boot	time  in the files and Other than mounting and unmounting file systems, users should not see any difference in the
       local file system.

       The GFS interface requires two system calls: and The system call handles generic mounted file system data.  The system call handles generic
       directory entries from any file system.

See Also
       getdirentries(2), getmnt(2), mount(2), fstab(5), nfs(5nfs), ufs(5), fsck(8), mount(8)

																	   gfsi(5)
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