[ILUG] Highpoint Sata RAID
paul at clubi.ie
Wed Mar 23 10:53:51 GMT 2005
On Tue, 22 Mar 2005, Niall O Broin wrote:
> software runs on a processor on the controller. With Linux software RAID, or
> RAID on the cheap Highpoint or Promise cards, the software runs on the host
Interestingly, the Promise SX4 SATA cards actually /are/ hardware
RAID. At least, they have onboard RAM and a XOR engine to be able to
accellerate RAID-5. The RAM allows the OS to only have to copy data
across the PCI bus once, and then issueing the disk transaction from
the card-local data.
Sort of a hardware-accellerated card. It doesn't get involved in the
details of managing RAID-5 - left for OS - but does provide the
hardware needed for fast RAID.
Linux md doesnt make use of that onboard hardware yet though.
Paul Jakma paul at clubi.ie paul at jakma.org Key ID: 64A2FF6A
When I works, I works hard.
When I sits, I sits easy.
And when I thinks, I goes to sleep.
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