After installing Linux, can I configure RAID 1 with the O/S partition (/, swap, boot) on the operating server?

[polaris]

Hi everyone,

After installing Linux, can I configure RAID 1 with the O/S partition (/, swap, boot) on the operating server?

I wonder if it is possible to configure SDA and SDB as RAID 1 as shown in the picture.
(The filesystem of / is LVM.)

Thank you in advance!

Have a great day

 

[KGIII]

I don't really have an answer for you, 'cause I haven't personally used RAID in like a decade. I did a very quick search to see if it was possible to deal with RAID after installing the OS and came away with this link:

How to Set Up Software RAID 1 on an Existing Linux Distribution

In this tutorial, we'll be talking about RAID, specifically we will set up software RAID 1 on a running Linux distribution.

www.linuxbabe.com

 

[f33dm3bits]

I haven't setup software raid in a long time but if you want it setup on the os disk(s) you will have to do it during the installation process. With CentOS there is an option for it at the disk setup window where you also create partitions.

I just did the setup I think you want in a vm, I think you are looking for something like this.

[[email protected] ~]# lsblk
NAME      MAJ:MIN RM  SIZE RO TYPE  MOUNTPOINT
sr0        11:0    1 1024M  0 rom
vda       253:0    0   20G  0 disk
├─vda1    253:1    0   18G  0 part
│ └─md125   9:125  0   18G  0 raid1 /
├─vda2    253:2    0    1G  0 part
│ └─md127   9:127  0    1G  0 raid1 [SWAP]
└─vda3    253:3    0    1G  0 part
  └─md126   9:126  0 1022M  0 raid1 /boot
vdb       253:16   0   20G  0 disk
├─vdb1    253:17   0   18G  0 part
│ └─md125   9:125  0   18G  0 raid1 /
├─vdb2    253:18   0    1G  0 part
│ └─md127   9:127  0    1G  0 raid1 [SWAP]
└─vdb3    253:19   0    1G  0 part
  └─md126   9:126  0 1022M  0 raid1 /boot

That's the best the installer can do which is first you create your partitions and volumes and then you can select which volumes you want to be raid and which raid version you want them to be. If you want a different raid setup where the whole disk is a raid device you will have to do boot from a live cd and then do your custom raid setup through the command-line. After which you can boot the centos installer and install the system on your custom raid setup.