For all of those out there getting into raid stuff, I have had many complaints over a period of time that peoples raids are under performing and I don't know if people actually understand why.
I'll quote an example using the Asus Striker II extreme , not to pick on Asus or this particular board as my understanding is that all boards operate in the way I'm about to describe.
Generally looking at a mother board you have 2 SATA connectors one above the other and manufacturers refer two this as two ports I.E SATA 1.0 and SATA 1.1, and they are ; however those two ports share bandwidth on one chip and thus if you plug an HD into each connection and stripe them the performance will pretty much suck.
Fixing the problem:
If you plug 1 HD into the Port SATA 1.0 and then plug another into SATA 2.0 and stripe it you will note quite a dramatic increase in speed as you are using the maximum bandwidth on each chip. I.E you should only plug one device in for each set of connectors in order to obtain maximum speed, this is correct also for PCIe SATA cards.
Personally I feel that when 1 Port will saturate the bandwidth of the chip running it that manufacturers should not refer to it as 2 SATA 3GBp/s ports as this is a little dishonest and will slow your drives down by using both connectors.
It also strikes me as very annoying that chipset manufacturers I.E intel are including so few SATA 3 connections on their motherboards... Whats the point in this, SATA 3 is AFAIK backward compatible with SATA 2, the only reason I can see that Intel is doing this is so that they can continue selling overpriced SAS/SATA controllers.
Whats your view.
I'll quote an example using the Asus Striker II extreme , not to pick on Asus or this particular board as my understanding is that all boards operate in the way I'm about to describe.
Generally looking at a mother board you have 2 SATA connectors one above the other and manufacturers refer two this as two ports I.E SATA 1.0 and SATA 1.1, and they are ; however those two ports share bandwidth on one chip and thus if you plug an HD into each connection and stripe them the performance will pretty much suck.
Fixing the problem:
If you plug 1 HD into the Port SATA 1.0 and then plug another into SATA 2.0 and stripe it you will note quite a dramatic increase in speed as you are using the maximum bandwidth on each chip. I.E you should only plug one device in for each set of connectors in order to obtain maximum speed, this is correct also for PCIe SATA cards.
Personally I feel that when 1 Port will saturate the bandwidth of the chip running it that manufacturers should not refer to it as 2 SATA 3GBp/s ports as this is a little dishonest and will slow your drives down by using both connectors.
It also strikes me as very annoying that chipset manufacturers I.E intel are including so few SATA 3 connections on their motherboards... Whats the point in this, SATA 3 is AFAIK backward compatible with SATA 2, the only reason I can see that Intel is doing this is so that they can continue selling overpriced SAS/SATA controllers.
Whats your view.