HP Serviceguard Extended Distance Cluster for Linux A.11.20.20 Deployment Guide, August 2013

1. Upgrade the Serviceguard version to A.11.20.10 and serviceguard-xdc version to A.11.20.10.
For information on upgrading to Serviceguard A.11.20.10 and serviceguard-xdc A.11.20.10,
see HP Serviceguard A.11.20.10 for Linux Release Notes.
2. Upgrade the Serviceguard version to A.11.20.20 and serviceguard-xdc version to A.11.20.20.
For information on upgrading to Serviceguard A.11.20.20 and serviceguard-xdc A.11.20.20,
see HP Serviceguard A.11.20.20 for Linux Release Notes.
3.2.4 Verifying the serviceguard-xdc Installation
After you install serviceguard-xdc, run the following command to ensure that the software is installed:
# rpm -qa| grep serviceguard-xdc
In the output, the product name, serviceguard-xdc-A.11.20.20-0 will be listed. The presence
of this file verifies that the installation is successful.
3.2.5 Removing serviceguard-xdc
To remove serviceguard-xdc from your environment, complete the following procedure:
For Red Hat 5:
# rpm -e serviceguard-xdc-A.11.20.20-0.rhel5.x86_64
For Red Hat 6:
# rpm -e serviceguard-xdc-A.11.20.20-0.rhel6.x86_64
For SUSE:
# rpm -e serviceguard-xdc-A.11.20.20-0.sles11.x86_64
3.3 Configuring the Storage Environment
After setting up the hardware as described in the Extended Distance Cluster Architecture section
and installing the Extended Distance Cluster software, see the following sections that describe each
of these processes in detail.
3.3.1 Configuring the Storage
This section describes the configuration changes recommended for both single path and multiple
paths to storage as described in Figure 3.
3.3.1.1 Setting the Value of the Link Down Timeout Parameter
After you install, you must set the Link Down Timeout parameter for the Fibre Channel cards
to a duration equal to the cluster reformation time. The value of cluster reformation time parameter
depends on the heartbeat interval and the node timeout values configured in a particular cluster.
To get the cluster reformation time set for a particular cluster:
cmviewcl –vf line | grep max_reformation_duration
This parameter prevents any data being written to a disk when a failure occurs. The value of this
parameter must be set such that the disks are inaccessible for a time period which is greater than
the cluster reformation time. This parameter is important in scenarios where an entire site is in the
process of going down. By blocking further writes to the MD device, the two disks of the MD device
remain current and synchronized. As a result, when the package fails over, it starts with a disk
that has current data.
The Fibre Channel cards are configured to hold up any disk access and essentially hang for a
time period which is greater than the cluster reformation time when access to a disk is lost. This is
achieved by altering the Link Down Timeout value for each port of the card. Setting a value
for the Link Down Timeout parameter for a Fibre Channel card ensures that the MD device
3.3 Configuring the Storage Environment 23