Rapid Storage Technology
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System Drive Recovery

GBayl1
Beginner
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If I create a Raid 1 array for my system (boot) drive and the primary drive fails, will the system automatically boot from the secondary disk or would I simply have to point the BIOS to the secondary drive to boot from it?

Thanks, Geoff

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JJaeg
New Contributor I
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Based on my experience with an albeit older Intel RAID chipset, I would expect that if a drive fails the array will then be in a "degraded" state, but should still operate. It should, in essence, still boot from the array - it isn't booting from the raw drive alone (and if I recall correctly, it cannot do so). You would not need to (and probably must not) make any BIOS setting changes, e.g. changing it from RAID to something else.

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GBayl1
Beginner
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Thanks. I guess the key point is whether the BIOS sees (a) a single drive (which is the RAID), so the alternate will be used automatically if the boot fails, or (b) just a physical drive as normal, then the RAID is in operation once Windows kicks in.

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JJaeg
New Contributor I
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Neither is exactly correct, but (a) is closer. The BIOS still sees the remaining drive as a RAID *member* operating in "degraded" mode (i.e., its RAID-1 partner mirror is missing in action).

Assuming that the Motherboard BIOS settings are unchanged (in particular that the BIOS disk controller remains in RAID mode), and one does not mess around with the remaining drive, the motherboard will still see it as a RAID member, as will the OS. You actually have to write over the RAID meta-data to turn it back into an "ordinary" drive.

Note that there are actually two pieces of BIOS involved: the Motherboard BIOS and the RAID support BIOS.

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Anonymous
Not applicable
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If your system is configured to boot from a RAID 1 array, it will automatically attempt to boot from the secondary disk if the primary disk fails. However, you may need to change the BIOS settings to point to the secondary disk in order for the system to successfully boot.

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AlHill
Super User
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@Anonymous Answering a thread that is more than four years old serves no purpose.

 

Doc (not an Intel employee or contractor)
[Maybe Windows 12 will be better]

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