write behind operation warning. What's it mean.

MCCALL,DON (HP-USA,ex1) don_mccall at hp.com
Wed Apr 11 15:44:30 GMT 2001


Hi Martin,
This typically means that the client attempted to write to a disk that is
getting close to full, or has quotas enabled.  There is a situation where
files written to a disk that is almost full/or quota almost exceeded can end
up corrupting files; see q-article (in microsoft support database) q290861.

  http://support.microsoft.com/support/kb/articles/Q290/8/61.ASP

Basically the message itself hearkens back to ms clients being able to
transfer data in a 'write-behind' mode, which means that,essentially, they
trust the server to actually write the data to disk AFTER the smb has been
responded to.  So if for some reason the actual disk write cannot be
performed (file system full, exceeded quota), the client doesn't actually
find out about it till the next smb request...
Microsoft reported a problem with this in its MCIS software as well in q
article q193932, though it's probably not related to your problem.

Whether it's actually a PROBLEM or not depends on how the client/application
that was doing the write handles it; it could attempt to re-write the data,
or return an error up to the user of the application indicating that the
operation (a save, whatever) failed.  Check with your users on this pc to
see what they are doing, and if they have experienced any application
errors...

Hope this helps,
Don



-----Original Message-----
From: Martin Rootes [mailto:M.J.Rootes at shu.ac.uk]
Sent: Wednesday, April 11, 2001 5:52 AM
To: samba at samba.org
Subject: write behind operation warning. What's it mean.


	We are seeing the following warning messages in event logs on PCs
that are accessing a 	
Samba server (Solaris 2.7, samba 2.0.6):-
 
03/03/04/2001,14:44:04,Rdr,Warning,None,3025,N/A,CIS-C033-04,A write-behind
operation has 
failed to the remote server ilex.  The data contains the amount requested to
write and the 
amount actually written.
 
What does this message actually mean? Does it indicate an underlying
problem? Is it 
something I should be very worried about?
 
 	Martin Rootes
 	Systems Support

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Martin Rootes - Senior Systems Programmer/Analyst, Sheffield Hallam
University
Email :         M.J.Rootes at shu.ac.uk                      Phone: 0114 225
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