The LSI 9211 is an HBA, and provides straight passthrough of the drives connected to it. There are no caching options for it.
It's very very likely that 6 modern onboard SATA controllers are faster than this HBA. For starters, at the OS level there is a lock for the driver that can serialize...
It's not a driver issue. The BIOS isn't presenting the hardware to the operating system. I'd suspect the PCI-X slots aren't configured properly in the system BIOS, or perhaps they aren't all meant to be utilized at once. I had some machines with very odd PCI-X configurations in them, such as...
After adding postgresql_enable="YES" to /etc/rc.conf run /usr/local/etc/rc.d/postgresql initdb
You can the edit /usr/local/pgsql/data/pg_hba.conf and /usr/local/pgsql/data/postgresql.conf to taste, then run /usr/local/etc/rc.d/postgresql start
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