Googling, looks like a "Sune Fire 280r" is usually a 2 cpu box. I've
no idea what a "1 * 200 gb raid" is, nor how fast your two 36 GB disks
(must be SCSCI) are, but that machine does
not sound like a
"big Solaris server". In fact, depending on how old it is (and thus
how fast the CPUs, etc. are), it sounds fairly puny.
The biggest question is your disk IO. Just what is that "1 * 200 gb
raid" exactly? If it is really a RAID 10 array with 4 or 8 disks or
something like that, you might be fine. But I don't think that's what
you have, and if my assumptions about your hardware are correct, it
would probably only cost a few thousand dollars to buy a brand new and
much faster Linux box.
Which isn't to say that your scaling problems are hardware related,
they might not be. But when good server hardware is so cheap, it
doesn't make sense to even try to run a large, high traffic site on a
slow machine.
