!Hola Gonzalo! I use Solaris 8 on a Sunfire v890 and have no performance problems (so far . I use MySQL 4.1.10, Apache 2.0.54 with the Worker MPM, PHP 4.3.11, and TurckMMcache 2.4.6.
Also, my Moodle 1.5.2+ shares the machine with Blackboard 5.5.1, and that old Bb system runs old 1.3.26 Apache and MySQL 3.23.32.
WHile the Bb system is heavily loaded as we begin a transition to Moodle, it's performance is limited by the mysql daemon, and by the memory available to apache. From this experience I strongly recommend using a threaded Apache. I can't judge PHP 5.x as I haven't tried it (does it work with MMcache?) As to the Mysql load, perhaps mytop would help show what it is doing? Also, you could try running myisamchk on the tables. Something like:
myisamchk --silent --force --fast --medium-check
-O key_buffer=64M -O sort_buffer=64M $DATADIR/*/*.MYI
Buena suerte, amigo!
--James
Hardware and performance
Moodle 1.5.2 & Solaris 10 performance problems
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