MBR on software RAID 10 CentOS

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spd00

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Feb 18, 2014
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I have a HP Proliant DL120 G7 running CentOS on 4 1TB HDD's software RAID10. After I've installed it and sent it for colocation in a datacenter, all is ok. But now I realized that MBR is installed on 1st HDD. If the first drive failes, I don't belive it will boot. Is there any way to copy MBR on a second drive or maybe on all drives, so if one fails there are 3 more to boot from? Thanks in advance.
 
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drtweak

drtweak

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Sep 17, 2012
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If you know what a Raid 10 Does you can tolerate a 2 Drive Failure and still run (So long both drives in the same Raid 1 fail). A Raid 10 is a Strip of 2 Mirros. So you have Two drives. Those are a Raid 1. and another 2 drive in a Raid 1. Then you have a Raid 0 of those two Raid 1's. If one drive in each Raid 1 fail you will be ok because it will just use the other drives until you replace them. So if the MRB is on Drive 1 and Drive 2 is part of the same mirror they BOTH have the MBR on it. Now when you setup a Raid it makes a Vitural Drive so do NOT think of the Raid 10 and 4 seperate drive. Windows will ONLY see it as ONE DRIVE hence why its on the first drive because the second drive is the second half of the Raid and windows always installs the MRB at the begining of the disk.
 
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