However, I keep getting conflicting advice.  My choices are along
these lines:

Dual Xeon 64bit with built-in 6-disk RAID10 or RAID5 (LSI RAID card)
Dual Opteron 64bit with built-in 6-disk RAID10 or RAID5 (LSI RAID card)
Dual Opteron 64bit with external RAID via fibre channel (eg, nstor)

An Opteron, properly tuned with PostgreSQL will always beat a Xeon in terms of raw cpu.

RAID 10 will typically always outperform RAID 5 with the same HD config.

Fibre channel in general will always beat a normal (especially an LSI) raid.

Dell's suck for PostgreSQL.


Joshua D. Drake

I'm sure any of these will whip the bottom off the Dell 2650, but which will be the fastest overall? No way to know without spending lots of money to test. :-(

Dell claims their new 2750 will be faster, but they've lost the battle
already, and won't commit to any performance numbers.  Won't even give
me a ballpark number.

Command Prompt, Inc., home of PostgreSQL Replication, and plPHP.
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note:Command Prompt, Inc. is the largest and oldest US based commercial PostgreSQL support provider. We  provide the only commercially viable integrated PostgreSQL replication solution, but also custom programming, and support. We authored  the book Practical PostgreSQL, the procedural language plPHP, and adding trigger capability to plPerl.

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