3.7.0 HP StorageWorks HP Scalable NAS File Serving Software installation guide HP Scalable NAS for Linux (AG513-96004, October 2009)

on the server. (The installation procedure in Chapter 2 specifies when to install the
driver.)
4. Modify system files
You may need to modify the following files on each server:
• Edit the /etc/hosts file. The operating system places both localhost and the
server name on the 127.0.0.1 entry in the /etc/hosts file. For example:
127.0.0.1 localhost.localdomain localhost
HP Scalable NAS requires that the server name appear on a separate line with
its real IP address, as in the following example. Be sure to move the server name
to its own line in the /etc/hosts file on each server. We recommend that you
specify the fully qualified name.
127.0.0.1 localhost
10.1.1.100 servername.localdomain
Normal operation of the cluster depends on a reliable network hostname resolution
service. If the hostname lookup facility becomes unreliable, this can cause reliab-
ility problems for the running cluster. Therefore, you should ensure that your
hostname lookup services are configured to provide highly reliable lookups,
particularly for the hostnames that are critical to cluster operation. These critical
hostnames include the hostnames of all servers in the cluster and the hostnames
of all FibreChannel switches being used with the cluster.
One easy way to ensure reliable hostname lookups is to put all critical hostnames
and their IP addresses in /etc/hosts on each of the servers (see the hosts(5)
man page.) After you have done this, ensure that the host lookup order in /etc/
nsswitch.conf specifies that the hosts file will be examined first (see the
nsswitch.conf(5) man page). Other mechanisms, apart from /etc/hosts,
can also be used, depending on your site's network configuration.
• Add psfs to the PRUNE FS list. In RHEL5, the list starts with PRUNEFS and is con-
tained in the file /etc/updatedb.conf file. In SLES10, the list starts with UP-
DATE_PRUNEFS and is contained in the file /etc/sysconfig/locate. The
following example shows an updated list on an RHEL5 system.
PRUNEFS = "auto afs iso9660 sfs udf psfs"
• For RHEL5 only, edit the /etc/init.d/halt script. When a server is rebooted,
the default /etc/init.d/halt script may need to probe each disk partition
to locate the root filesystem. If a server has been excluded from the cluster, these
probes can generate SCSI disk errors or hangs when the server is rebooted.
Install the operating system58