Designing Disaster Recovery Clusters using Metroclusters and Continentalclusters, Reprinted October 2011 (5900-1881)

HP StorageWorks Smart Tiers
Metrocluster with Continuous Access for P9000 and XP Version A.11.00 includes support for Smart
Tiers on HP StorageWorks P9000 Disk Array family. Using Smart Tiers one can configure the
storage consisting of multiple kinds of hard disk drives including SSD, SAS, and SATA. All restrictions
and guidelines that are applicable to HP StorageWorks P9000 Smart Tiers are applicable in the
Metrocluster environment. For information on HP StorageWorks P9000 Smart Tiers, see the HP
StorageWorks P9000 Provisioning for open systems user guide at : http://
bizsupport1.austin.hp.com/bc/docs/support/SupportManual/c02535118/c02535118.pdf.
Creating the Cluster
Create the cluster or clusters according to the process described in the Managing Serviceguard
user’s guide. In the case of a metropolitan cluster, create a single Serviceguard cluster with
components on multiple sites. In the case of Continentalclusters, create two distinct Serviceguard
clusters on different sites.
NOTE: Do not configure an P9000 or XP series paired volume, PVOL or SVOL, as a cluster lock
disk. A cluster lock disk must always be writable. Since it cannot be guaranteed that either half of
a paired volume is always writable, neither half may be used as a cluster lock disk. A configuration
with a cluster lock disk that is part of a paired volume is not a supported configuration.
Preparing the Cluster for Data Replication
This section assumes that you have already created one or more Serviceguard clusters for use in
a disaster tolerant configuration. The following procedures will prepare Serviceguard clusters for
use with Continuous Access P9000 or XP data replication in a metropolitan or Continentalclusters.
• Creating the RAID Manager Configuration
• Configuring a remote array RAID Manager instance
• Defining Storage Units
• Configuring Packages
Creating the RAID Manager Configuration
Use these steps to create the configuration:
1. Ensure that the P9000 or XP Series disk arrays are correctly cabled to each host system that
will run packages whose data reside on the arrays.
Each P9000 or XP Series disk array must be configured with redundant Continuous Access
links, each of which is connected to a different LCP or RCP card. To prevent a single point of
failure (SPOF), there must be at least two physical boards in each XP for the Continuous Access
links. Each board usually has multiple ports. However, a redundant Continuous Access link
must be connected to a port on a different physical board from the board that has the primary
Continuous Access link. When using bi-directional configurations, where data center A backs
up data center B and data center B backs up data center A, you must have at least four
Continuous Access links, two in each direction. Four Continuous Access links are also required
in uni-directional configurations in which you want to allow failback.
2. Install the Raid Manager software for either P9000 or XP on each host system depending on
each host system depending on the disk array used in your environment.
3. Edit the /etc/services file, adding an entry for the Raid Manager instance to be used
with the cluster.
The format of the entry is:
horcm<instance-number> <port-number>/udp
For example:
164 Building Disaster Recovery Serviceguard Solutions Using Metrocluster with Continuous Access for P9000 and XP