Memory problems on a -sunfire T2000

UNIX Solaris
1

I work with a network management tool, which, for various reasons, is installed on a solaris server.This is a Sunfire T2000 server with 16 CPUs and 8GB of RAM. I have installed a Solaris 10 ZFS and 8GB swap. From the beginning I had problems with memory occupation that it rises progressively to 95% of the 8GB, no swapping, no cpu problems. When I run a top command, I see that sum of these processes is less than 2 gb. Do you have any idea where I can find the 6GB I missing?

2

In the ZFS ARC cache and similar. It's actually not a problem as this is still available memory.

Run this:

echo ::memstat | mdb -k
3

The problem is that when memory is above 87% occupancy, it shuts down the network monitoring application, which is all this server has installed. Although, there is not core.

bash-3.00# echo ::memstat | mdb -k
Page Summary                Pages                MB  %Tot
------------     ----------------  ----------------  ----
Kernel                      83685               653    8%
ZFS File Data              267573              2090   26%
Anon                       186106              1453   18%
Exec and libs               10172                79    1%
Page cache                   5512                43    1%
Free (cachelist)             4313                33    0%
Free (freelist)            455652              3559   45%
Total                     1013013              7914
Physical                  1007838              7873
bash-3.00# 
You have new mail in /var/mail/root
bash-3.00#
4

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5

Why is this monitoring application shutting down ?

One workaround might be to limit the arc cache size:
http://www.solarisinternals.com/wiki/index.php/ZFS\_Evil\_Tuning\_Guide\#Limiting\_the\_ARC_Cache