On 08/16/2010 10:35 AM, Freddie Cash wrote:
On Mon, Aug 16, 2010 at 7:13 AM, Mike DeMarco<mikej...@yahoo.com> wrote:
What I would really like to know is why do pci-e raid controller cards cost
more than an entire motherboard with processor. Some cards can cost over $1,000
dollars, for what.
Because they include a motherboard and processor. :) The high-end
RAID controllers include their own CPUs and RAM for doing all the RAID
stuff in hardware.
The low-end RAID controllers (if you can even really call them RAID
controllers) do all the RAID stuff in software via a driver installed
in the OS, running on the host computer's CPU.
And the ones in the middle have "simple" XOR engines for doing the
RAID.stuff in hardware.
And the irony is that the expensive hardware RAID controllers really aren't a
good idea for ZFS. For a ZFS application, you're far better off to use a simple
HBA in JBOD mode, and such HBAs can be had in the $100-$200 range.
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