So, here's how it works.
Solaris can address a boat-load of memory, replies have stated systems
running with up to 64gb and Casper stated that they don't sell systems
with memory that isn't usable. So whatever the max that Sun systems can
hold can be addressed. Swap space is a different story; 2gb for 2.5.1,
4gb for 2.6 and 7 in 32-bit mode, 4+ for 7 in 64-bit mode and 8.
32-bit processes can address not quite 4gb (call it 4 for practical
purposes) and 64-bit processes on a 64-bit OS can address more.
The short answer is; Solaris will address all the memory you can put in
the box, no matter what version. If you're wondering why a 32-bit
process can only address 4gb and a 32-bit OS can address much more than
that it's because of the MMU (memory management unit) that Sun uses. If
you want details on that you'll have to look elsewhere. :-}
Special Thanks goes to Casper Dik (isn't that often the case?) for
explaining in detail how it happens.
Also thanks to:
Chris O'Malley Ravi Channavajhala
Mike DeMarco Nickolai Zeldovich
Paul Yahnig Dave Foster
A.D. Dunham Danny Johnson
Kevin Buterbaugh Frank Smith
Jeff Kennedy wrote:
> A quick question about Solaris 7 and the memory it can address. I was
> asked if Solaris 7 would address 4 gb's RAM and I said yes. Then I
> thought, "I better double check .....".
> I was willing to bet my paycheck on it and still am but I like to cover
> all bases when possible. We have several 420's that are loaded, that's
> what they are wondering about.
=================== Jeff Kennedy UNIX Administrator AMCC email@example.com
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