I noticed a strange issue when creating RAID array with *mdadm*. As far as I see, it creates additional devices of
md type. According to the kernel.org documentation, the md device type is Metadisk (RAID) devices.
> The metadisk driver is used to span a filesystem across multiple
> physical disks.
However, this started to happens today on the same host. (I am using a configuration management tool to create a RAID array, but the same happens when I issue the *mdadm* commands manually.
*lsblk* output looks like below:
user@host:~$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
nvme0n1 259:0 0 1.7T 0 disk
└─md0 9:0 0 3.5T 0 raid0
└─md0p2 259:2 0 1.8T 0 md
xvda 202:0 0 20G 0 disk
└─xvda1 202:1 0 20G 0 part /
xvdf 202:80 0 20G 0 disk
nvme1n1 259:1 0 1.7T 0 disk
└─md0 9:0 0 3.5T 0 raid0
└─md0p2 259:2 0 1.8T 0 md
Can someone shed some light? Is this expected? I am seeing this for the first time.
Host is *Ubuntu 16.04.6 LTS*
**Clarification**
Why are these created:
└─md0p2 259:2 0 1.8T 0 md
Asked by Alan Kis
(283 rep)
Aug 13, 2019, 11:48 AM
Last activity: Aug 13, 2019, 02:55 PM
Last activity: Aug 13, 2019, 02:55 PM