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i have installed 2 harddisk (hda, hdc) as mirroring in RH7.3. I use this command (cat /proc/mdstat) to check the md0, it works fine(UU). So i do a testing (unplug the power cable of hda) to assume the hda down, then i reboot. it can't boot into my hdc after that.
First, check the bios, make sure it will boot from that drive, Second, try it the other way. It might not have a boot sector, I'm not sure how the mirroring stuff all works, but also, it isn't able to initialize the raid because half of it is missing
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