Configuring Max_Luns; Considerations For Using Quorum Disk; Max_Luns; Quorum Disk - Red Hat CLUSTER SUITE FOR ENTERPRISE LINUX 5.1 Configuration Manual

Chapter 2. Before Configuring a Red Hat Cluster
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.img
In this example,
acpi=off
starting with "kernel /vmlinuz-2.6.18-36.el5".
Example 2.11. Kernel Boot Command Line with

4. Configuring max_luns

It is not necessary to configure
In Red Hat Enterprise Linux releases prior to Red Hat Enterprise Linux 5, if RAID storage in a
cluster presents multiple LUNs, it is necessary to enable access to those LUNs by configuring
(or

max_luns

max_scsi_luns
Red Hat Enterprise Linux 5, cluster nodes detect multiple LUNs without intervention required; it
is not necessary to configure

5. Considerations for Using Quorum Disk

Quorum Disk is a disk-based quorum daemon,
determine node fitness. With heuristics you can determine factors that are important to the
operation of the node in the event of a network partition. For example, in a four-node cluster
with a 3:1 split, ordinarily, the three nodes automatically "win" because of the three-to-one
majority. Under those circumstances, the one node is fenced. With
set up heuristics that allow the one node to win based on access to a critical resource (for
example, a critical network path). If your cluster requires additional methods of determining
node health, then you should configure
Note
Configuring
node health. An example of a special requirement is an "all-but-one"
configuration. In an all-but-one configuration,
enough quorum votes to maintain quorum even though only one node is working.
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has been appended to the kernel boot command line — the line
in Red Hat Enterprise Linux 5.
max_luns
for 2.4 kernels) in the
to detect multiple LUNs.
max_luns
qdiskd
to meet those needs.
qdiskd
is not required unless you have special requirements for
qdiskd
Appended to It
acpi=off
/etc/modprobe.conf
, that provides supplemental heuristics to
qdiskd
is configured to provide
qdiskd
file of each node. In
however, you can