It’s a raid with mdadm:
$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
[...]
sdb 8:16 0 931.5G 0 disk
└─sdb1 8:17 0 931.5G 0 part
└─md0 9:0 0 931.4G 0 raid1
└─vg_raid-lv_data0 253:2 0 500G 0 lvm
sdc 8:32 0 931.5G 0 disk
└─sdc1 8:33 0 931.5G 0 part
└─md0 9:0 0 931.4G 0 raid1
└─vg_raid-lv_data0 253:2 0 500G 0 lvm
$ sudo mdadm --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Mon May 13 22:09:50 2019
Raid Level : raid1
Array Size : 976629440 (931.39 GiB 1000.07 GB)
Used Dev Size : 976629440 (931.39 GiB 1000.07 GB)
Raid Devices : 2
Total Devices : 2
Persistence : Superblock is persistent
Intent Bitmap : Internal
Update Time : Mon Aug 26 22:58:43 2019
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Consistency Policy : bitmap
Name : toaster-tonedomain:0 (local to host toaster-tonedomain)
UUID : 4709cbb9:aecaa9e2:f5889d7f:c6207b4f
Events : 2960
Number Major Minor RaidDevice State
0 8 17 0 active sync /dev/sdb1
1 8 33 1 active sync /dev/sdc1
It was created like this:
sudo mdadm --create /dev/md0 --level=mirror --raid-devices=2 /dev/sd[bc]1
Then I created pv, vg amd lv upon it:
sudo pvcreate /dev/md0
sudo pvdisplay
sudo vgcreate vg_raid /dev/md0
sudo vgdisplay
sudo lvcreate -L 500G vg_raid -n lv_data0
sudo lvdysplay
sudo mkfs.xfs /dev/vg_raid/lv_data0
I note now that when I use pvs, vgs and lvs commands, I cannot display raid vg and lv infos:
# pvs --all
PV VG Fmt Attr PSize PFree
/dev/fedora/home --- 0 0
/dev/fedora/root --- 0 0
/dev/fedora/swap --- 0 0
/dev/md0 --- 0 0
/dev/sda1 fedora lvm2 a-- 231.88g 0
/dev/sda2 --- 0 0
/dev/vg_raid/lv_data0 --- 0 0
# vgs --all
VG #PV #LV #SN Attr VSize VFree
fedora 1 3 0 wz--n- 231.88g 0
# lvs --all
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
home fedora -wi-ao---- 154.05g
root fedora -wi-ao---- 70.00g
swap fedora -wi-ao---- <7.83g