Matt Garman wrote:
Are you talking about using additional SATA controllers (i.e. via
add-on cards)? Or simply talking about the interconnect between the
southbridge and the northbridge?
Don't count on it, it depends on the specific setup of the MB.
I think you're talking about the former, i.e. the SATA controller
integrated in the southbridge generally ought to be fine, but if you
start adding additional controllers that hang off the south bridge,
their could be competition for bandwidth to the northbridge...
right? (And wouldn't the nvidia chips have an edge here, since they
have everything combined into one chip?)
Again, it depends on how much bandwidth was allocated internally in
the chip just because it is one chip does not mean that anyone
actually allocated enough resources to the given part of the chip, or
even has enough feed to the chip to support them all. The Seagate
1.5's will stream quite a bit higher numbers than previous disks, so
if one had several of them they could overload the allocated
bandwidth. Things build-into a given MB aren't always connected at
full speed often some of them are actually pci bus parts and suffer
from slow access, I would expect there to be similar tradeoffs even in
single chip cases.
Makes intuitive sense anyway; but in my case I'm really just curious
about the SATA controller integrated into the southbridge; not
concerned with additional SATA controllers.
The build-in intel ich series controllers vary from version to version
on exactly how fast that they are in this test, the newer ones are
faster than the older ones.
Is the "parallel dd test" valid if I do a raw read off the device,
e.g. "dd if=/dev/sda of=/dev/null"? All my drives are already in an
md array, so I can't access them individually at the filesystem
level.
Thanks for the feedback and info!
Matt
Yes, that is valid, so long as the md device is fairly quiet at the
time of the test. Since you already have a machine, please post the
mb type, and number/type of sata ports and the 1-disk, 2-disk,
3-disk,... numbers that you get.
I am looking at getting a new AMD solution in the next month or so and
would like also know which scales reasonably.
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