emacs question

[Jeffrey Leitner <leitnerj@us.ibm.com>]

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I have a user in Cypress that has one of our NAS 200 boxes with SFU 
installed.

They claim when they use emacs 21.1.1 in a unix to unix environment they 
have no issues.  However when they use the IBM NAS 200, Win2K based with 
Services for Unix and try to edit a file that resides on the NAS (with an 
AIX box) they get the following message...

"<filename> changed on disk, really edit the buffer(y,n,r or C-h)? "
The CU uses gnu emacs ver 21.1.1 and xemacs ver 21.1 (both were installed 
from AIX  Toolbox for Linux Applications) 
They do not get this error when using vi in the same environment.

The customer has input the following:
Open  a file with emacs, that resides on NAS file system.
Then try to open again (with  emacs), a file that resides on "pure" AIX 
filesystem  i.e /tmp.
In both  files, write something, save it, and  just wait 1-2 min.
If your try to append something in both files, the result will not be the 
same. 
In the first case, you will get the message from emacs that ""<filename> 
changed on disk, really edit the buffer(y,n,r or C-h)? ". 

In the second case, if you try to append to the file that was opened from 
/tmp, you will be able to append and continue writing with 
no warnings.

The claim is that they are  be sure that the problem is related with NAS 
and not with emacs.
I have combed the internet and found this message to be a superfluous, 
common message. 
Going onto discover that emacs uses buffers as it common element to save 
and transfer files. It seems, buffer messages are routine.

The customer wishes to recreate the scenario on a standard W2K box running 
SFU to see if it will show up there as well.
Based on my finding, this seems pointless.

Question:
1) Is this a common element found with emacs or windows in this type of 
set up?
If so,
2) What is causing this message and what can the Customer do to prevent 
it?



Thanks,

Jeff Leitner
Product Engineer | IBM  Storage Systems Group | SAN/NAS/Router Support
Internet mail:  leitnerj@us.ibm.com | Phone 919-254-0842 (TL 444) |  FAX 
919-543-8677

My shipping address:

600 Park Offices Dr.
EC1A/Bldg 660/E208
Research Triangle Park, NC 27709

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