lvm - Is there any way to setup a raid device after installation? - Ask Ubuntu


i set storage-manager server connect via iscsi main system , trying set mirrored volume. resultant volume mirror of /dev/sda1 , /dev/sdd4, noticed there no raid devices set up. (here output of cat /proc/mdstat)

    personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]     unused devices: <none>

due set lvm combines 2 disks not wanted... raid1... how... mdadm?

tried it: output of following command says "mdadm: no raid-devices specified" 

    sudo mdadm --create --verbose /dev/md0 --level=raid1 /dev/sdd4 /dev/sda1

i'm assuming because device /dev/md0 doesn't exist.

so question how/could make /dev/md0 raid device work raid1 setup , mdadm (without reinstalling system)? if proves impossible, how set mirrored lvm on ubuntu 16.04?

any insight appreciated. thanks!

thanks terrance found tutorial works great

https://www.howtoforge.com/how-to-set-up-software-raid1-on-a-running-system-incl-grub2-configuration-ubuntu-10.04

basically instructions follows:

    1.) change partition type --> fdisk /dev/sdd --> press t, select partition, l list codes, looking "linux raid setup" fd     2.) above every volume plan add --> fdisk /dev/sda | t | 1 | fd     3.) 0 superblock of devices --> mdadm --zero-superblock /dev/sdd4     4.) create raid device --> mdadm --create /dev/md0 --level=1 --raid-disks=2 /dev/sdd4 /dev/sda1     5.) check make sure device exists --> cat /proc/mdstat --> should see raid device     6.) create filesystems on our raid array --> mkfs.ntfs /dev/md0      7.) mount raid array --> mount /dev/md0 /srv      8.) recommend benchmark array have idea if going wrong

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