George Spelvin writes:
> I have an AM2 motherboard with onboard SB600 AHCI, connected to 10
> identical 2 TB hard drives:
> - 4 from the onboard SB600 (sd[abcd])
> - 2 from the motherboard PDC42819 (sd[ef])
> - 4 from a Si3132 PCIe card (sd[ghij])
>
> I can copy (RAID resync, actually) from sda to sdc (or sdb to sdd)
> at around 100 MB/s.
> But copying sda to sde (or sdb to sdf) runs around 25-33 MB/s.
...
> 04:00.0 RAID bus controller [0104]: Promise Technology, Inc. PDC42819 [FastTrak TX2650/TX4650] [105a:3f20]
There's no public documentation for the PDC42819 aka FastTrak TX{2,4}650.
The only reason it works at all is that it includes an AHCI interface.
But all the advanced stuff is hidden from us.
You can try asking Promise for PDC42819 programming documentation, or
failing that for a 100% open-source driver (no binary blobs).
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