If RAID storage in your cluster presents multiple LUNs (Logical Unit Numbers), each cluster node must be able to access those LUNs. To enable access to all LUNs presented, configure max_luns in the /etc/modprobe.conf file of each node as follows:
Open /etc/modprobe.conf with a text editor.
Append the following line to /etc/modprobe.conf. Set N to the highest numbered LUN that is presented by RAID storage.
options scsi_mod max_luns=N
For example, with the following line appended to the /etc/modprobe.conf file, a node can access LUNs numbered as high as 255:
options scsi_mod max_luns=255
Save /etc/modprobe.conf.
Run mkinitrd to rebuild initrd for the currently running kernel as follows. Set the kernel variable to the currently running kernel:
#cd /boot#mkinitrd -f -v initrd-kernel.imgkernel
For example, the currently running kernel in the following mkinitrd command is 2.6.9-34.0.2.EL:
# mkinitrd -f -v initrd-2.6.9-34.0.2.EL.img 2.6.9-34.0.2.EL
You can determine the currently running kernel by running uname -r.
Restart the node.