8.0-RELEASE/amd64 - full ZFS install - low read and write disk performance

[Artem Belevich]

aoc-sat2-mv8 was somewhat slower compared to ICH9 or LSI1068
controllers when I tried it with 6 and 8 disks.
I think the problem is that MV8 only does 32K per transfer and that
does seem to matter when you have 8 drives hooked up to it. I don't
have hard numbers, but peak throughput of MV8 with 8-disk raidz2 was
noticeably lower than that of LSI1068 in the same configuration. Both
LSI1068 and MV2 were on the same PCI-X bus. It could be a driver
limitation. The driver for Marvel SATA controllers in NetBSD seems a
bit more advanced compared to what's in FreeBSD.

I wish intel would make cheap multi-port PCIe SATA card based on their
AHCI controllers.

--Artem

On Mon, Jan 25, 2010 at 3:29 AM, Pete French
<petefrench at ticketswitch.com> wrote:
>> I like to use pci-x with aoc-sat2-mv8 cards or pci-e cards....that way you
>> get a lot more bandwidth..
>
> I would goalong with that - I have precisely the same controller, with
> a pair of eSATA drives, running ZFS mirrored. But I get a nice 100
> meg/second out of them if I try. My controller is, however on PCI-X, not
> PCI. It's a shame PCI-X appears to have gone the way of the dinosaur :-(
>
> -pete.
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