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

Artem Belevich fbsdlist at src.cx
Mon Jan 25 17:27:27 UTC 2010

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.


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.
> _______________________________________________
> freebsd-stable at freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-stable
> To unsubscribe, send any mail to "freebsd-stable-unsubscribe at freebsd.org"

More information about the freebsd-questions mailing list