open /dev/mptctl: No such device. Make sure mptctl is loaded into the kernel
Posted by Category: Linux AdministrationThe “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
Tags: add mtpctl module in rc.modules, how to check raid status using mpt-status?, how to create a mptctl device?, how to load mptctl module in kernel?, Make sure mptctl is loaded into the kernel, mknod /dev/mptctl, open /dev/mptctl: No such device
May 19th, 2011 at 7:15 am
Thanks very much for this tip!
Best regards,
queo