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Full Discussion: How to read a fast written log file at Real time speed?
Top Forums UNIX for Advanced & Expert Users How to read a fast written log file at Real time speed? Post 302936759 by achenle on Friday 27th of February 2015 12:13:42 PM
Old 02-27-2015
Reliable read-behind-write on NFS? That's not going to happen because NFS is stateless. And yes, what you're trying to do is called "read-behind-write":

https://www.google.com/search?q=%22read+behind+write%22

If you have a requirement to monitor those logs, you need to monitor them another way. Reading them over NFS is not going to work.
 

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LEARN ABOUT CENTOS

tapset::nfsd

tapset::nfsd(3stap)													       tapset::nfsd(3stap)

NAME

       tapset::nfsd - systemtap nfsd tapset

DESCRIPTION

       nfsd.dispatch
	      NFS server receives an operation from client

	       See probe::nfsd.dispatch(3stap)
	       for details.

       nfsd.proc.lookup
	      NFS server opening or searching for a file for client

	       See probe::nfsd.proc.lookup(3stap)
	       for details.

       nfsd.proc.read
	      NFS server reading file for client

	       See probe::nfsd.proc.read(3stap)
	       for details.

       nfsd.proc.write
	      NFS server writing data to file for client

	       See probe::nfsd.proc.write(3stap)
	       for details.

       nfsd.proc.commit
	      NFS server performing a commit operation for client

	       See probe::nfsd.proc.commit(3stap)
	       for details.

       nfsd.proc.create
	      NFS server creating a file for client

	       See probe::nfsd.proc.create(3stap)
	       for details.

       nfsd.proc.remove
	      NFS server removing a file for client

	       See probe::nfsd.proc.remove(3stap)
	       for details.

       nfsd.proc.rename
	      NFS Server renaming a file for client

	       See probe::nfsd.proc.rename(3stap)
	       for details.

       nfsd.open
	      NFS server opening a file for client

	       See probe::nfsd.open(3stap)
	       for details.

       nfsd.close
	      NFS server closing a file for client

	       See probe::nfsd.close(3stap)
	       for details.

       nfsd.read
	      NFS server reading data from a file for client

	       See probe::nfsd.read(3stap)
	       for details.

       nfsd.write
	      NFS server writing data to a file for client

	       See probe::nfsd.write(3stap)
	       for details.

       nfsd.commit
	      NFS server committing all pending writes to stable storage

	       See probe::nfsd.commit(3stap)
	       for details.

       nfsd.lookup
	      NFS server opening or searching file for a file for client

	       See probe::nfsd.lookup(3stap)
	       for details.

       nfsd.create
	      NFS server creating a file(regular,dir,device,fifo) for client

	       See probe::nfsd.create(3stap)
	       for details.

       nfsd.createv3
	      NFS server creating a regular file or set file attributes for client

	       See probe::nfsd.createv3(3stap)
	       for details.

       nfsd.unlink
	      NFS server removing a file or a directory for client

	       See probe::nfsd.unlink(3stap)
	       for details.

SEE ALSO

	  probe::nfsd.dispatch(3stap),	    probe::nfsd.proc.lookup(3stap),	 probe::nfsd.proc.read(3stap),	  probe::nfsd.proc.write(3stap),
       probe::nfsd.proc.commit(3stap),	  probe::nfsd.proc.create(3stap),    probe::nfsd.proc.remove(3stap),	probe::nfsd.proc.rename(3stap),
       probe::nfsd.open(3stap),    probe::nfsd.close(3stap),	probe::nfsd.read(3stap),    probe::nfsd.write(3stap),  probe::nfsd.commit(3stap),
       probe::nfsd.lookup(3stap),	 probe::nfsd.create(3stap),	     probe::nfsd.createv3(3stap),	   probe::nfsd.unlink(3stap),
       probe::nfsd.rename(3stap),  stap(1), stapprobes(3stap)

IBM
									---						       tapset::nfsd(3stap)
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