CA ARCserve Backup r12 - Cluster Support
With the spiraling cost of downtime and the increased need for application availability 24x7, enterprises are constantly
looking for ways that provide high application availability while controlling costs. Keeping in mind this concern, CA brings
easy-to-use solutions with its support for cluster aware installation in MSCS and NEC cluster environment to provide
round-the-clock application availability with minimum impact to business continuity.
Overview
CA ARCserve Primary/Member/Stand-alone servers
achieve continuous application availability with their
support for MSCS and NEC cluster aware installations.
ARCserve database (SQL/SQL Express) can also be
implemented as cluster aware.
Benefits
•
Round-the-clock availability of CA ARCserve
Backup server.
•
Increased success rate of backups and restores
when a failover occurs.
When a failover happens, CA ARCserve server ensures
that no manual intervention is required to restart
services on other nodes. Active/crashed jobs that have
failed are taken over by another node. It also takes care
to ensure that the Jobs scheduled in future will continue
to run as expected.
Install
Installation of cluster node is a simple process, similar to the normal installation procedure. CA ARCserve Backup server
should be installed onto the shared disk by selecting Cluster Environment Installation option in the installation wizard.
CA ARCserve in a cluster environment supports the following cluster platforms - Microsoft Cluster Server (MSCS) on
X86/X64/IA64 Windows server and NEC ClusterPro/ExpressCluster 8.0 for Windows and NEC ClusterPro/ExpressCluster X
1.0 for Windows.
Objective: To install/configure ARCserve on
Clusters.
Pre-requisite: ARCserve Backup Cluster
Group is created with Shared Disk, Virtual
IP, and Virtual Name resources. ARCserve as
clu ster aware applicatio n can also b e
installed on existing cluster aware resource
groups.
Process: After installation of ARCserve
server onto the shared disk from all the
nodes in the cluster, a post setup screen
pops up with an option to create HA
resources. Even though the post setup
screen pops up after every installation from
cluster nodes, this option must be checked
only after completing installation from the
last node in the cluster. Checking this option
after installing CA ARCserve Backup on the
last node in the cluster triggers the creation
of HA resources. Getting the ARCserve
cluster resources manually online brings
ARCserve services online.
CA ARCserve Cluster Deployment
When a job is running on a Primary/Member server and the server fails over, CA ARCserve makes sure that after the
failover the job that had failed “because of the failover” is resumed automatically from the last failure point. The “job
resume” can be at the volume level or node level.
Cluster aware CA ARCserve Backup server supports two types of failovers.
Planned Failover: Planned failovers occur when it is necessary to perform maintenance on the active node within a
cluster. It can be performed by migrating CA ARCserve cluster resources from an active node to a passive node from the
cluster administrator.
Unplanned Failovers: Unplanned failovers occur because of hardware or software failures.
ARCserve Database Failover with SQL Server
CA ARCserve r12 supports SQL Server 2005 Express Edition (default) and SQL Server Standard/Enterprise edition as its
database. Depending on the differences of cluster platforms (MSCS/NEC) and whether SQL database can be deployed as
cluster aware application or not, different strategies are adopted. The below table displays the supported cluster and SQL
database combinations.
Cluster Platform
MSCS
MSCS
MSCS
NEC
NEC
SQL Server Type (Local)
SQL
SQL
SQL
SQL
SQL
Express
Standard/Enterprise (but non-cluster)
Enterprise Cluster
Express
Standard/Enterprise (cluster/non-cluster)
Supported
Yes
No
Yes
Yes
No
SQL Server Express + MSCS
Though SQL Server Express Edition is not a cluster aware application in MSCS, CA supports it by providing extra
configurations:
1.
2.
By creating ARCserve database onto a shared disk during setup. But the SQL server meta database should be
kept in %program_file%\SQLserver.
By registering SQL Server Express instance in MSCS as a managed resource. This puts ARCserve database under
control of MSCS as well as ARCserve.
SQL Server 2005 Express + NEC Cluster
Though SQL Server Express Editions are not native cluster aware applications in NEC cluster environment, CA supports it
by providing customized failover script.
1.
By installing SQL Server’s system database (binaries, master, model etc.) on the Operating System partition and
installing ARCserve database onto the shared disk hosted by ARCserve to make sure the active and passive
nodes share the same database files.
2.
By customizing failover script to make sure that ARCserve database is always attached to the new active node in
case of failover.
Frequently Asked Questions
Q.
A.
What are the components that CA ARCserve supports as cluster aware?
CA ARCserve supports server and database as cluster aware components while Agents are not cluster aware.
Q.
A.
How do I uninstall CA ARCserve if the ARCserve in on cluster?
To uninstall CA ARCserve on a cluster, follow the uninstallation steps specified in ARCserve Admin Guide.
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