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2.4. Configuring max_luns
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.confwith 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.conffile, a node can access LUNs numbered as high as 255:options scsi_mod max_luns=255
- Save
/etc/modprobe.conf. - Run
mkinitrdto rebuildinitrdfor the currently running kernel as follows. Set the kernel variable to the currently running kernel:#
cd /boot#mkinitrd -f -v initrd-kernel.img kernelFor example, the currently running kernel in the followingmkinitrdcommand 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.ELNote
You can determine the currently running kernel by runninguname -r. - Restart the node.
