How many processors are active in box ?

[Dusan Djordjevic]

Hi all,

I should perform upgrades to a box that I did not install so I am out of
documents. What confuses me is following:

-According to /etc/issue, it is running RHEL 5.2 (Red Hat Enterprise Linux
Server release 5.2 (Tikanga)). As far as I know. ES supports up to 2
processors
-It seems server do have 4 x Opteron 850 physical processors
-cat /proc/cpuinfo shows that box do have 4 processors

I am confused here. If only 2 processors are supported by ES, how comes I
can see all of them ? Are they active all, or just I can see them but kernel
uses only 2 ?

Why someone installed ES on 4 processors box is another question, not for
here :)

Thank you in advance.

Best regards,
Dusan