LVM Snapshot Problem: "snapshot: Required device-mapper target(s) not detected in your kernel"

Applies To:

Linux OS – Version Oracle Linux 7.0

Linux x86_64 on Oracle Public Cloud

 

Goal:

Create an LVM snapshot using lvcreate

Symptoms:

[root@test /]# lvcreate -L 1G -s -n root_snap /dev/mapper/vgRoot-lv_root
 /usr/sbin/modprobe failed: 1
 snapshot: Required device-mapper target(s) not detected in your kernel.
 Run `lvcreate --help' for more information.
[root@test /]#

 

Solution:

This error means that the module snapshot is not present in the current kernel, this can be validated by running: 

[root@test /]# uname -r
 3.10.0-862.11.6.el7.x86_64
 [root@test /]# find /lib/modules | grep snapshot
 /lib/modules/3.10.0-1160.49.1.el7.x86_64/kernel/drivers/md/dm-snapshot.ko.xz
 /lib/modules/3.10.0-1160.88.1.0.1.el7.x86_64/kernel/drivers/md/dm-snapshot.ko.xz