Same behavior here. Gigabyte Z77M-D3H. Tested with 3 Samsung 2TB and after that with 3 WD 500 GB . RAID 5 write performance goes down in one minute from 120 MB/s to 30 MB/s.
Tested under WIn7 64 Bit and Windows Home Server 2011.
Newest Intel Storage Driver 126.96.36.1993
Intel Celeron 530. CPU usage 5%-15%. 8 GB RAM
So what ? Z77 not really ready to use as RAID5?
In german i say: ********
Message was edited by: Mark H @ Intel to remove a vulgar word.
I have the same motherboard as you, although not running RAID 5.
But I was experimenting with the Smart Response Technology that uses a small SSD in RAID0 to accelerate an HDD. When I enabled the acceleration, my transfer speeds dropped from 125 MB/s to 14 MB/s.
I should add, my performance improved significantly when I replaced my SSD with a new one with better Sequential write speeds.
Mine happened to be with Windows 8, but probably the performance is about the same.
I don't have 5 hard drives laying around, but I could test a couple of 640 GB drives. Mine are not "Green" drives, however.
And which controller/s (or SATA ports) do you have them on?
Thanks for your reply. I have connected the three hard disks to Port 2,3,4.
Perhaps my HDDs are to slow ? So I destroyed the RAID5 and used all three disks as non member disk.
Then i build the Raid5 with Windows Home Server and i got 60 MB/S write speed - constant. That' s not mouch,
but twice as much as configured under 'Controller Bios Setup'. So the HDD's are not the limiting factor. I should get the 60MB/s under both conditions. I would expect, that the 'Intel-Raid' perform better, than Windows Home Sever Raid.
Now I am stuck. Buying an expensive RAID Controller, or exchange the board with an other Z77M-D3H, or with a board with H77 Chipset ? Buying faster HDDs , or like you tested: using a SSD for 'acceleration Mode' ?
I startet a Ticket at Gigabyte, too. No answer yet.
And finally i tested the performance of the three single disks : all three disks has a write speed between 110 MB/s an 121 MB/s.
Vielen Dank für Ihre Antwort.
Das Problem mit der Raid 5 Performance konnte nachgestellt werden.
Dieses Problem wurde an Intel weitergeleitet, da es bei allen Z77 Chipsätzen so zu sein scheint, unabhängig vom Board Hersteller.
Schauen Sie in 2-3 Wochen bei Intel direkt nach, ob es neue Chipsatz Treiber gibt.
Derzeit können wir keine Lösung anbieten, da auch wir auf Intel warten müssen.
Motherboard #1: Z77M-D3H
CPU: i5 3470
Memory:OCZ DDR3 1333 FSB 2gb (dual channel)
a. WD 500 GB x 3pcs.
OS: Window 8 64 bits.
Mit freundlichen Grüßen
Windows 8 Ready:
Insist on an Ultra Durable