[CentOS] md raid 10

Ljubomir Ljubojevic office at plnet.rs
Thu Mar 8 12:47:09 EST 2012


On 03/08/2012 02:03 PM, Ross Walker wrote:
> On Mar 7, 2012, at 7:48 PM, Ljubomir Ljubojevic<office at plnet.rs>  wrote:
>
>> We are talking about *software* /boot partition on RAID1! that can have
>> any number of member partitions. And the rest of the disk here discussed
>> is *software* "mdraid RAID10" with 1,2,3,4,... member partitions, not
>> regular hardware RAID1+0!!
>
> I think that line of discussion started when someone mentioned their Ubuntu with grub2 can do mdraid10 whole disk, /boot whatever.

I am referring to OP question.

>
> Of course with whole disk or /boot mdraid10, you don't know which of the 4 drives (besides the first) is bootable (mdraid10 distributes copies), so you'll need to add MBR and grub to all 4 and swap them around until it booted.
>
> In a 4 disk mdraid10 setup, even with grub2, the best method is still /boot as a 4 disk mdraid1 so any of the 4 can boot. Though you only need grub on the first two, cause if they are both out so is the mdraid10.

Setting boot on other two should be done, so if someone mixes up cables 
system still boots. It's only 2-3 minutes more to do it right. I do not 
belive in half-done jobs, always bite me if I do that.

-- 

Ljubomir Ljubojevic
(Love is in the Air)
PL Computers
Serbia, Europe

Google is the Mother, Google is the Father, and traceroute is your
trusty Spiderman...
StarOS, Mikrotik and CentOS/RHEL/Linux consultant


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