Fix Error: open /dev/mptctl: No such device. Make sure mptctl is loaded into the kernel

The “mptctl” kernel module is required to check the RAID status on a Linux server using “mpt-status” tool. You may receive “/dev/mptctl: No such device” message OR “Make sure mptctl is loaded into the kernel” while checking the RAID status which indicates that the module is not loaded in the kernel OR the device “/dev/mptctl” is not created.

[root@server ~]# mpt-status
open /dev/mptctl: No such device
Are you sure your controller is supported by mptlinux?
Make sure mptctl is loaded into the kernel

To create the mptctl device, execute:

# mknod /dev/mptctl c 10 22

and verify it by

# ls -la /dev/mptctl
crw——- 1 root root 10, 220 Apr 12 08:05 /dev/mptctl

Once the device is created, load the module in the kernel using modprobe

# modprobe mptctl

and verify it using lsmod which should list the following modules along with it’s details

# lsmod |grep mptctl
mptctl
mptbase
scsi_mod

Add the module in /etc/rc.modules file to load the module in kernel on every reboot.

modprobe mptctl

Save the file. This will make sure the module is loaded in the kernel on every server reboot.
Once done, you will be able to check the RAID status by executing the ‘mpt-status’ command and it should show something like the following:

[root@server ~]# mpt-status

ioc0 vol_id 0 type IM, 2 phy, 465 GB, state OPTIMAL, flags ENABLED
ioc0 phy 1 scsi_id 1 ATA ST3500418AS CC38, 465 GB, state ONLINE, flags NONE
ioc0 phy 0 scsi_id 4 ATA ST3500418AS CC38, 465 GB, state ONLINE, flags NONE