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RAID 0+1 configuration. How can I tell which drive failed?

Six months ago, I built a system for myself that consists of an ASUS A8N-SLI mobo and four Seagate 160 GB SATA drives in a RAID 0+1 configuration, using the NVidia drivers bundled with the mobo.  Everything worked until recently, when I started receiving alerts during system bootup that one of my drives has failed.  I've checked all of the cables and power connections.  I tried running Spinrite 6 but the program hung at the detect stage.  I've since learned that Spinrite is unable to work with RAID 0+1 (at least that what I gathered from Steve Gibson's website).  I need to know which drive is the faulty one so I can get it replaced.  What's the best course of action?
1 Solution
That motherboard has an nVidia RAID system.   I don't have that board; but have read the nVidia RAID documentation, and NVRAID supports a Disk Alert System, which is supposed to pictorially show which SATA port on the motherboard the failed drive is connected to.

According to Page 5-5 of your motherboard's manual (http://dlsvr03.asus.com/pub/ASUS/mb/socket939/A8N-SLI%20Premium/e2435_a8n-sli_premium.pdf), your system includes this feature, and the manual for the Disk Alert System is on your support CD.

You need to simply run Disk Alert, and then look on the motherboard and you'll know which disk has failed :-)
I do not have said motherboard either, but in a RAID 0+1 the whole stripe is seen as bad.  The only way to see which stripe and possibly narrowing the process to a single drive would be through a GUI management interface if one is available for the RAID controller you use, or by going through the BIOS configuration utility.  You should determine the issue and correct it as soon as possible.  A drive failure in the remaining stripe will lead to data loss.  Safest bet would be to replace the failed pair of drives.  Then test each drive individually to determine the bad one.
thescudAuthor Commented:
My apologies for letting this question slide -- it was due to a personal problem that I don't really want to divulge here.  I will assign the points to garycase though strangely, I never could get the Disk Alert system to work even though the s/w was installed with the ForceWare drivers.

I will ask a follow-up question to help me resolve this still outstanding issue.

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