samba - Sep 1999 - Shared Memory Problems

I just thought I'd throw this out there because it doesn't seem normal
to me.

We have 2.0.5a on AIX 4.3.2.

We initially tried to increase the shared mem size to 4MB. This would not happen
until we rebooted AIX. Then smbstatus reported a 4MB shared mem size. Now we are
trying to decrease it because we will only need about 2MB and it won't
reduce. I
suspect it will when we reboot again.

This does not seem like normal behavior to me. Could someone from the Team
explain why this might happen?

Bill

-- 



	/------------------------------------------------------\
	|                                                      |
	|                 William E. Jojo, Jr.                 |
	|                                                      |
	|         Senior Systems and Network Specialist        |
	|                                                      |
	|            Hudson Valley Community College           |
	|                                                      |
	|                    (518) 629 7540                    |
	|                                                      |
	|                   jojowil@hvcc.edu                   |
	|                                                      |
	\------------------------------------------------------/


	
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William Jojo said:
> I just thought I'd throw this out there because it doesn't seem 
> normal to me.
> 
> We have 2.0.5a on AIX 4.3.2.
> 
> We initially tried to increase the shared mem size to 4MB. This would 
> not happen until we rebooted AIX. Then smbstatus reported a 4MB 
> shared mem size. Now we are trying to decrease it because we will 
> only need about 2MB and it won't reduce. I suspect it will when we 
> reboot again.
> 
> This does not seem like normal behavior to me. Could someone from the 
> Team explain why this might happen?
This is actually the way SysV style shared memory works - we had same problems
under Solaris.  Basicly you have to remove the shared memory to change the
size and Samba will not do this for you.

I wrote a little script which follows to give an idea of what to do:

#!/bin/sh
#
# Simple script to release shared memory segment - to allow for resizing.
# To do this HAVE to stop ALL smbd - so only or schedule for quiet times.
#
 
# stop all smbd
/LOCAL/etc/rc3.d/S75smbd stop
 
# wait little while
/bin/sleep 10
 
# now remove shared memory by key - sorry for magic key
/bin/ipcrm -M 0x00280267
 
# restart smbd
/LOCAL/etc/rc3.d/S75smbd start
 
# end of shmem_release.sh

- obviously this is for my set up under Solaris - but should give the right
clue!

-- 
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| Peter Polkinghorne, Computer Centre, Brunel University, Uxbridge, UB8 3PH,|
| Peter.Polkinghorne@brunel.ac.uk   +44 1895 274000 x2561       UK          |
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