1.Checking which disks to use for mirror
[root@rifle ~]# lvmdiskscan/dev/centos_rifle/root [ <6.20 GiB]
/dev/sda1 [ 1.00 GiB]
/dev/centos_rifle/swap [ 820.00 MiB]
/dev/sda2 [ <7.00 GiB] LVM physical volume
/dev/vg_mydata/lv_mydata [ 1.50 GiB]
/dev/sdb [ <1.04 GiB] LVM physical volume
/dev/sdc [ 519.34 MiB] LVM physical volume
/dev/sdd [ <1.99 GiB]
/dev/sde [ 2.00 GiB]
5 disks
1 partition
2 LVM physical volume whole disks
1 LVM physical volume
In my case I have two almost identical disks: /dev/sdd and /dev/sde.
2. Creating Physical Volume
[root@rifle ~]# pvcreate /dev/sdd /dev/sde
Physical volume "/dev/sdd" successfully created.
Physical volume "/dev/sde" successfully created.
Checking physical volumes
[root@rifle ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/sda2 centos_rifle lvm2 a-- <7.00g 0
/dev/sdb vg_mydata lvm2 a-- 1.03g 0
/dev/sdc vg_mydata lvm2 a-- 516.00m 32.00m
/dev/sdd lvm2 --- <1.99g <1.99g
/dev/sde lvm2 --- 2.00g 2.00g
3. Creating Volume Group named vg_mirror
[root@rifle ~]# vgcreate vg_mirror /dev/sdd /dev/sde
Volume group "vg_mirror" successfully created
Check VG
[root@rifle ~]# vgs
VG #PV #LV #SN Attr VSize VFree
centos_rifle 1 2 0 wz--n- <7.00g 0
vg_mirror 2 0 0 wz--n- 3.98g 3.98g
vg_mydata 2 1 0 wz--n- <1.54g 32.00m
I created new virtual group vg_mirror with two PVs and no LVs in it.
4.Creating a new mirrored Logical Volume
[root@rifle ~]# lvcreate -m 1 -l100%FREE -n lv_mirror vg_mirror
Logical volume "lv_mirror" created.
Where parameters are:
-m 1 - have one mirror copy of data
-l100%FREE - use all free space on the volume group
Check status of the new logical volume:
[root@rifle ~]# lvs /dev/vg_mirror/lv_mirror
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
lv_mirror vg_mirror rwi-a-r--- 1.98g 100.00
100.00 - means that both copies are in sync
5.Creating file systems
[root@rifle ~]# mkfs -t ext4 /dev/vg_mirror/lv_mirror
mke2fs 1.42.9 (28-Dec-2013)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
129792 inodes, 519168 blocks
25958 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=532676608
16 block groups
32768 blocks per group, 32768 fragments per group
8112 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912
Allocating group tables: done
Writing inode tables: done
Creating journal (8192 blocks): done
Writing superblocks and filesystem accounting information: done
6.Creating mount point and mount
[root@rifle ~]# mkdir /mirrored_data
[root@rifle ~]# mount /dev/vg_mirror/lv_mirror /mirrored_data/
Checking file system size:
[root@rifle ~]# df -h /mirrored_data/
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_mirror-lv_mirror 2.0G 6.0M 1.8G 1% /mirrored_data
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