I currently run 6 Oracle 9i and 10g dbs using 8GB SGA apiece in containers on a
v890 and find no difficulties starting Oracle (though we don't start all the
dbs truly simultaneously). The ARC cache doesn't ramp up until a lot of IO has
passed through after a reboot (typically a steady rise over 4-8 hours). I use
the mdb -k method at startup before the containers come up and the zfs datasets
are available, with mixed success in being able to hold down kernel arc memory
over time but with a definite extension of free memory.. Setting ARC cache
limits helps for awhile after a system has been up and is slowly gaining cache
but, generally speaking, Oracle runs well even with a low free and high arc
cache and that ARC does dump memory reasonably well (though with added
overhead) in S10U3, allowing me to start a single instance of Oracle with an
8GB SGA on a machine showing only 4GB free (according to top). And then
another. And then another.
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