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.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 rebuildinitrd
for the currently running kernel as follows. Set the kernel variable to the currently running kernel:#
cd /boot
#mkinitrd -f -v initrd-kernel.img kernel
For example, the currently running kernel in the followingmkinitrd
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
Note
You can determine the currently running kernel by runninguname -r
. - Restart the node.