There are two ways to upgrade the cluster subsystem.
This Adaptive Server release supports the following cluster
platforms for high availability:
-
Perform a major upgrade,
which involves cluster downtime, then shutting down and restarting
all servers. In this case, you must:
-
Run sp_companion
suspend, as described in Using Sybase Failover
in a High Availability System.
-
Offline the resource groups of primary and secondary
companions on both nodes. Ensure that
the companion server and corresponding resource groups are not automatically brought online until the cluster system
upgrade is complete.
-
Upgrade the cluster subsystem following the instructions
from the cluster system vendor. You may find options to migrate the
current resource groups to the new cluster version. If such an option
is not available (or if the resource groups get deleted or corrupted),
re-create the resource groups and configure them appropriately after
you have upgraded the cluster system.
-
Bring the resource groups online. This should bring
primary and secondary companions online on their respective nodes.
-
Run sp_companion resume as
described in Using Sybase Failover in a High Availability
System.
-
Perform a minor upgrade, to avoid
cluster downtime. Nodes are failed over to other nodes and upgraded one at a time. For example, assuming ASE1 is the primary companion
on node N1, and ASE2 is secondary companion running on node N2:
-
Upgrade the primary
companion:
-
Failover ASE1 from
N1 to N2. Achieve this by relocating the primary resource
group to N2 or by shutting down ASE1.
-
Upgrade the cluster subsystem on N1 following the
upgrade instructions provided by the vendor.
-
Fail back ASE1 from N2 to N1. See the appropriate
cluster chapter in Using Sybase Failover in a High Availability
System for more details on Adaptive Server failback.
-
Upgrade the secondary companion. If you are using a symmetric configuration, follow
the steps in “upgrade the primary companion,” above,
for ASE2.
If you are using an
asymmetric configuration:
-
Take the secondary
resource group offline and verify ASE2 is shut down. ASE2 is not
available during this upgrade.
-
Upgrade the cluster subsystem on N2 following the
upgrade instructions from the vendor.
-
Start ASE2 by bringing the secondary resource group
online to N2.