Managing Serviceguard Extension for SAP on Linux (IA64 Integrity and x86_64), February 2008
Step-by-Step Cluster Conversion
Linux Configuration
Chapter 3 127
IS320 Installation Step:
If you need to establish frontend and server LANs to separate network
traffic, be sure to add static routing entries to the internet routing
configurations of /etc/sysconfig/network/routing file. Route all
relocatable client LAN addresses to the local server LAN addresses. For
example, a two package concept would result in two entries:
<relocdb> <relocdb_s> 255.255.255.255
<relocci> <relocci_s> 255.255.255.255
IS380 Installation Step:
In /etc/fstab - comment out any references to file systems that are
identified as EXCLUSIVE in section “Planning the LVM layout for
Clustered SAP Environments”.
IS390 Installation Step:
Make sure that the content of /etc/fstab is not recreated during system
reboot. The file /etc/rc.d/boot.vginit is executed during reboot by
default. It should not perform any action for shared volume groups. If
this file exists remove it from /etc/rc.d and save it in another backup
directory
IS391 Installation Step:
By default Linux performs an LVM vgscan whenever the system is
rebooted. LVM vgscan attempts to detect and allocated and
non-allocated volumes and create /dev/xxx entries for volume groups it
finds. This could “cause problems” for volumes used in a Serviceguard
environment where a Serviceguard package has been stopped in a
cluster. In this case the stopped volume would not be allocated by any
cluster node. And therefore would be claimed by the booting node. When
that Serviceguard package tries to start it will fail because the storage
volume is already in use.
For SUSE - the vgscan can be prevented by removing
/etc/rc.d/boot.lvm and saving it in another backup directory.
For Redhat - use the following procedure to prevent a vgscan command
at boot time:
After your volume groups have been created on a node, back them up
using vgcfgbackup, then comment out (there are two places in this file
that you need to comment out) the following lines in the
/etc/rc.d/rc.sysinit file: