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AHCI vs RAID

post #1 of 7
Thread Starter 
What is the performance difference going to be? I'm slightly annoyed, as apparently the ASUS P8P67 Pro, despite having both the Marvell controller and the Intel controller for SATA can only set EVERY sata port to RAID or AHCI. ***?

Anyway, I picked up 2 spinpoint f3s to RAID, but apparently that means I have to take my SSD boot drive into raid mode (and format and reinstall to boot), so I'm wondering what kind of performance hit that will incur? Maybe I'll just use one of these HDs as batting practice if it's not worth it and I can't raid without buying a hardware controller.

I wonder if the UD7 I traded could have split AHCI and raid, I am rather regretting my decision to trade down lately
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post #2 of 7
You do NOT have to re-install your OS if its windows 7 all you have to do is change a registry setting
Here: http://support.microsoft.com/kb/922976

Also if your intel raid chip behaves like mine, ONLY drives you setup in the raid bios will get put into raid mode and the other SATA ports will still function in AHCI mode, but I would still edit the registry setting because it might cause a BSOD if you dont.

You will likely also have to go into bios and reset boot devices.

I just did this to my sig rig a while ago and switched my OS from single drive to a RAID0 setup.. without even re-installing!

TALE OF CAUTION: Raid is great, but if you ever boot your rig with the raid setting in AHCI it will likely write your first drive out of the raid and fail it, I had this happen and lost 2 months of data. I am rather skilled in data recovery and I could not get any programs to rebuild my raid0 properly to get the data back.
Edited by Killam0n - 4/25/11 at 2:33am
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post #3 of 7
Quote:
Originally Posted by ocpokey View Post
What is the performance difference going to be? I'm slightly annoyed, as apparently the ASUS P8P67 Pro, despite having both the Marvell controller and the Intel controller for SATA can only set EVERY sata port to RAID or AHCI. ***?

Anyway, I picked up 2 spinpoint f3s to RAID, but apparently that means I have to take my SSD boot drive into raid mode (and format and reinstall to boot), so I'm wondering what kind of performance hit that will incur? Maybe I'll just use one of these HDs as batting practice if it's not worth it and I can't raid without buying a hardware controller.

I wonder if the UD7 I traded could have split AHCI and raid, I am rather regretting my decision to trade down lately
I have the asus p8p67 deluxe which is like one step up and i have 2 1tb f3rs in raid and i use 2 ssds which are not in raid.
i do not know of any limitation that says only every other sata can be raid but i do know that the drives connected to the marvel controller can not be raid. just install the intel raid control from your mobo disk or from asus site.
Also i did not need any registry editing.
When loading into windows, after you install the raid controller, after your bios splash screen there will be a screen for the raid controller and on my system i have to press Ctrl+I to enter the raid set up, when in there all i had to do was select the drives and the stipe. Then when i got into windows i had to go into the drive manager and assign the volume a letter and do the format into what ever file system you want
Edited by Razzal - 4/25/11 at 2:41am
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post #4 of 7
Thread Starter 
It states in my user manual

Quote:
Due to chipset limitation, when set any of SATA ports to RAID mode, all SATA ports run at RAID mode together
(sic)

When I run in RAID mode the Ctrl+I screen comes up (I raided my drives already) but Windows BSODs at boot, when I set back to AHCI windows boots but I cannot access the raid setting.

EDIT: It looks like my user manual is retarded. I checked the device manager and voila there was my RAID setup. Hooray!

Reps to you guys for pointing me in the right direction and making me happy again

I seem to be in AHCI (as that's what my SSD was set up under) with the raid volume working fine, so hopefully all is well that ends well.
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post #5 of 7
to clarify what I meant is:

If you set your SATA ports to RAID mode and then go into Ctrl+i (raid setup) and set 2 drives into a RAID and then leave the SATA ports as RAID MODE you can still use other onboard sata ports for non raid drives and they will behave like AHCI mode.

*you should still be able to use plug and play on the other sata ports too.

I have a intel ICH10R chip for my onboard sata ports and I can tell you that in RAID mode I can use a combo of RAID drives and NON RAID drives at the same time on my onboard sata ports.


I did have an issue where I reset my bios to defaults and forgot to change my sata mode back to RAID and it booted into windows in AHCI mode.. This caused one of my drives to get written out of the RAID and when I went back into the bios and changed the sata mode back to RAID it was too late and one of my raid drives had been marked as bad. This issue broke the raid and I lost data, however both drives were actually fine from a hardware standpoint and I was able to re-format them and re setup raid0.
Edited by Killam0n - 4/25/11 at 2:55am
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post #6 of 7
Thread Starter 
Quote:
Originally Posted by Killam0n View Post
to clarify what I meant is:

If you set your SATA ports to RAID mode and then go into Ctrl+i (raid setup) and set 2 drives into a RAID and then leave the SATA ports as RAID MODE you can still use other onboard sata ports for non raid drives and they will behave like AHCI mode.

*you should still be able to use plug and play on the other sata ports too.

I have a intel ICH10R chip for my onboard sata ports and I can tell you that in RAID mode I can use a combo of RAID drives and NON RAID drives at the same time on my onboard sata ports.


I did have an issue where I reset my bios to defaults and forgot to change my sata mode back to RAID and it booted into windows in AHCI mode.. This caused one of my drives to get written out of the RAID and when I went back into the bios and changed the sata mode back to RAID it was too late and one of my raid drives had been marked as bad. This issue broke the raid and I lost data, however both drives were actually fine from a hardware standpoint and I was able to re-format them and re setup raid0.
Well, I'm still not terribly clear on what the hell my motherboard is doing, as it only has 1 setting for AHCI or RAID across all ports. So I'm just going to hope for the best and that I dont experience what you experienced, although I don't have any terribly critical data anyway.

Thanks for the info.
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post #7 of 7
I've read these Posts and like some of you that have the ASUS boards and use CTRL-I to enter your RAID BIOS setup switching between RAID and AHCI can cause problems, but yes you can simultaneously set your other SATA ports to run single drives in AHCI mode in addition to running your primary RAID.


SOLUTION FOR FAILED ARRAY OR DRIVE IN AN ARRAY:

Now when you encounter errors such as the RAID controller marking an array or drive as FAILED in the array....because you switched between modes or some other condition caused the error and your POST BOOT sequence shows your RAID drives as RED onscreen and when booting into a second partition or installation in your RAID doesn't work.

THERE IS A WAY AROUND THIS....STOP....and....READ.

You can use a separate drive with Win 7 with which you were sure and intently installed the Intel RST driver utility package.

Step 1 Power down then disconnect the data cables from your RAID
Step 2 connect a spare dedicated data cable to your spare Win 7+updates drive with the Intel RST program installed and boot from it, make sure its boot order is ok in the BIOS and/or bootable on the correct port.
Step 3 After having booted to the spare Win 7 drive, plug in the data cables to your RAID again while within Windows and then launch the Intel RST Utility....or if neccessary reboot with all drives making sure your spare Win 7 is the bootable or first boot device in your BIOS.
Step 4 Within the Intel RST utility you will see the failed array....you want to look for the option to set the drives to normal which clears the error condition of the RAID. Set it to normal.
This does not set the hard disks or RAID to normal.
Step 5 power down, unplug your spare, reboot and re-enter your BIOS to set your boot order back to the RAID save to your BIOS or BIOS profile, reboot again and voila, you should be back in your OS
There is no data loss when this error condition occurs.

Its a matter of knowing how to handle it....so all you need is a spare drive with Win7+updates and the RST utility from Intel, a spare SATA cable and port, because you will still need your RAID data cables while you are booted into your spare drive.

I have used this procedure a few times and it works for me because I don't give up on such problems.
Edited by ekrash - 8/18/12 at 2:14pm
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