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Full Discussion: zone breaching 'capped-memory' threshold
Operating Systems Solaris zone breaching 'capped-memory' threshold Post 302577423 by soliberus on Tuesday 29th of November 2011 04:24:31 AM
Old 11-29-2011
zone breaching 'capped-memory' threshold
Calling upon all Solaris zone experts.

I have a Sun T3-1 that is running a few whole-root zones. I've set the 'capped-memory' setting on all the zones.

However, I have a problem on the one zone. Under load it uses more memory that has been allocated to it.

Code:
zonecfg -z sunrep02 export

...
add capped-memory
set physical=8G
end
...

When I run 'top' inside the zone it reports the correct memory

Code:
Memory: 8192M phys mem

Yesterday I had a problem with a rogue Oracle process and the zone managed to use more than the capped size of 8GB

The global zone has 16GB of RAM, so the sunrep02 zone should never use more than 50%.

Running 'prstat -Z' in the global zone returned the following:

Code:
...
     3      146   15G   10G    66%   3:40:36 0.5% sunrep02
...

In this instance it managed to grap 66% of the global zone's physical memory.

How is it possible for the zone to use more than 8GB of memory? Am I missing something in my zone's config?

Many thanks
 

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LEARN ABOUT OPENSOLARIS

zcons

zcons(7D)							      Devices								 zcons(7D)

NAME

       zcons - Zone console device driver

DESCRIPTION

       The  zcons character driver exports the console for system zones. The driver is comprised of two "sides:" a master side with which applica-
       tions in the global zone communicate, and a slave side, which receives I/O from the master side. The slave side is available in the  global
       zones.

       Applications must not depend on the location of /dev or /devices entries exported by zcons. Inside a zone, the zcons slave  side is fronted
       by /dev/console and other console-related  symbolic links, which are used by applications that expect to write to the system console.

       The zcons driver is Sun Private, and may change in future releases.

FILES

       /dev/zcons/<zonename>/masterconsole

	   Global zone master side console for zone <zonename>.

       /dev/zcons/<zonename>/slaveconsole

	   Global zone slave side console for zone <zonename>.

       /dev/zconsole

	   Non-global zone console (slave side).

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+
       | Interface Stability	     |Sun Private		   |
       +-----------------------------+-----------------------------+

SEE ALSO

       zoneadm(1M), zonecfg(1M), attributes(5), zones(5)

SunOS 5.11							    24 Aug 2003 							 zcons(7D)
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