Specifications

Configuring the ESS for clustering
The following section describes how to configure an ESS for clustering on the
HP-UX 11.00 operating systems using MC/ServiceGuard.
Configuring MC/ServiceGuard on an HP-UX 11.00 with the ESS
This section describes how to configure a Hewlett-Packard host system for
clustering for HP-UX.
The steps to configure MC/ServiceGuard with the ESS are the same as the steps in
the Hewlett-Packard high availability documentation. You can find that
documentation at the following Web site:
www.docs.hp.com/hpux/ha/index.html
After you configure your host for normal operating system access, the ESS acts as
a normal disk device in the MC/ServiceGuard configuration. IBM recommends that
you create volume groups that contain the volumes using the Hewlett-Packard
logical volume manager. This method of disk management is more reliable, easier,
and more flexible than whole-disk management techniques.
Creating volume groups also allows you to implement PV-Links, Hewlett-Packard’s
built-in multipathing software, for highly available disks such as the ESS. To
establish PV-Links, perform the following steps:
1. Create the volume group, using the path to the volumes that you want as the
primary path to the data.
2. Extend the volume group with the path to the volumes that are intended as
alternate paths.
The logical volume manager reads the label on the disk and knows that it is an
alternate path to one of the volumes in the group. The logical volume manager
labels the volume.
For example, if a host has access to a volume on an ESS with the device
nodes c2t0d0 and c3t0d0, you can use the c2 path as the primary path and
create the volume group using only the c2t0d0 path.
3. Extend the volume group to include the c3t0d0 path. When you issue a
vgdisplay -v command on the volume group, the command lists c3t0d0 as an
alternate link to the data.
Attaching with fibre-channel adapters
This section describes the host system requirements and provides procedures to
attach an ESS to a Hewlett-Packard 9000 host system with fibre-channel adapters.
Attachment requirements
This section lists the requirements for attaching the ESS to your host system:
v Ensure that you have the installation script file. The script file is on the compact
disc that you receive with the ESS.
v Ensure that you have 1 MB minimum of hard disk space available to install the
2105inst script file.
v Check the LUN limitations for your host system; see Table 6 on page 11.
v Ensure that you have the documentation for your host system and the IBM
Enterprise Storage Server User’s Guide. The User’s Guide is on the compact
disc that you receive with the ESS.
Chapter 3. Attaching to a Hewlett-Packard 9000 host 41