Red Hat ENTERPRISE LINUX 4 - ADMINISTRATION Guía de instalación descargar pdf (Pagina 29)

4. When the cluster is configured and running, verify that the node turns off immediately when

fenced.

Note

You can fence the node with the fence_node command or Conga.

Example 2.12. Kernel Boot Command Line with acpi=off Appended to It

# grub.conf generated by anaconda

# Note that you do not have to rerun grub after making changes to this file

# NOTICE: You have a /boot partition. This means that

# all kernel and initrd paths are relative to /boot/, eg.

# root (hd0,0)

# kernel /vmlinuz-version ro root=/dev/VolGroup00/LogVol00

# initrd /initrd-version.im g

#boot=/dev/hda

default=0

timeout=5

serial --unit=0 --speed=115200

terminal --timeout=5 serial console

title Red Hat Enterprise Linux Server (2.6.18-36.el5)

root (hd0,0)

kernel /vmlinuz-2.6.18-36.el5 ro root=/dev/VolGroup00/LogVol00

console=ttyS0,115200n8 acpi=off

initrd /initrd-2.6.18-36.el5.im g

In this example, acpi=off has been appended to the kernel boot command line — the line starting

with "kernel /vmlinuz-2.6.18-36.el5".

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. T o enable access to all LUNs presented, configure m ax_luns in the

/etc/m odprobe.conf file of each node as follows:

1. Open /etc/m odprobe.conf with a text editor.

2. 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/m odprobe.conf file, a node can

access LUNs numbered as high as 255:

options scsi_mod max_luns=255

3. Save /etc/m odprobe.conf.

4. Run m kinitrd to rebuild initrd for the currently running kernel as follows. Set the kernel

variable to the currently running kernel:

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Red Hat ENTERPRISE LINUX 4 - ADMINISTRATION Guía de instalación Pagina 29