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Are there performance penalties for using RAID when AHCI would work?

Last response: in Storage
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February 15, 2014 12:30:49 AM

Hi, my question is: what are the drawbacks of having a system configured in RAID mode but with no slave drives (i.e. AHCI would work). Is there a performance drag? If so, how much? Is there a higher chance for system errors or drive failure?

If it matters, the reason I am asking is below:

I recently updated my system from a 1TB HDD with 40GB SRT cache to a 256GB SSD. I moved the 1TB drive to a secondary drive, but made the mistake of unnecessarily leaving the 40GB SRT drive in the machine to cache the 1TB drive. That gave me a config of:

* 256GB SSD
* 1TB 7200 RPM
* 40GB SSD(SRT/cache for the 1TB drive)

About a week after spending 12 hours doing a full reinstall (and 5 more days downloading my company's server) the 40GB SSD drive failed.

Removing the failed drive caused a chain reaction of problems: an EC flash error occurred, and I had to reset the CMOS. That reset the machine to AHCI and it wouldn't boot. I reset to RAID mode, and for my next 3 reboots had numerous startups errors and delays.

The machine is now booting properly and seems to be running at full speed. I really do NOT want to have to reinstall windows again, unless is is necessary.

Thanks for your help!!!

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a c 528 G Storage
February 15, 2014 8:15:17 AM

AHCI mode is a subset of RAID mode, so any HDD or SSD connected to a SATA port in RAID mode will automatically default to AHCI mode if it is not part of an actual RAID array.
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February 15, 2014 9:58:10 AM

Dereck47 said:
AHCI mode is a subset of RAID mode, so any HDD or SSD connected to a SATA port in RAID mode will automatically default to AHCI mode if it is not part of an actual RAID array.


Thanks :) 
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