How to mirror an active boot disk on Redhat/CentOs

Hello experts,

I wonder if it's possible to mirror an active boot disk on redhat.

I know how to do it during the install, but not after the install. I want to learn how to do it on a production server.
Williams225System AdministatorAsked:
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SandyCommented:
You need to follow the below steps.

1. Need to boot in resuce mode and mount chroot.
2. Now convert existing / partition into meta device  (fdisk ==> Type ==> fd)
3. Now create a new HDD partition and convert into the same type.
4. Now initialize the meta device /dev/md0 with new partition.
5. once it is done then just attach / part in array.


!!! Cheers. but be carefull
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arnoldCommented:
There are several examples online that deal with transitioning.
https://wiki.archlinux.org/index.php/Convert_a_single_drive_system_to_RAID
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