Switchover to CAM ATA?

Dag-Erling Smørgrav des at des.no
Wed Apr 28 07:35:52 UTC 2010

Alexander Motin <mav at FreeBSD.org> writes:
> I haven't dug really deep into current ataraid(4), but AFAIK it is all
> done in software. At least there is no any offloading support on the
> controller drivers level. None of ata(4) drivers do anything except
> executing one ATA command at a time.


That doesn't mean they *shouldn't* use offloading.

Like I said, I started working on checksum offloading for Promise SATA
controllers, but ZFS came along and I replaced the controllers because
of data corruption issues (which turned out to be either a driver bug or
a PCI timing bug which sos@ worked around in the driver, I forget which)

> Any URLs?

Google "Promise FastTrak SATA RAID"

I have two or three of those, including one with on-board SDRAM (but no
battery backup)

Dag-Erling Smørgrav - des at des.no

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