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when installing grub(2) to mdadm devices are you supposed to install it to /dev/sdX or /dev/mdX?

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This Q&A has some more information: unix.stackexchange.com/questions/203279/where-to-install-grub/… – Ned64 May 14 '15 at 9:15

You have to install it on /dev/sdX devices because grub runs before you are able to know that that your are using raid devices. And you should install grub on all active disk that are part of the mdadm.

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