Serviceguard Extension for SAP Version A.06.00 for Linux Release Notes, December 2012

The livecache module provides instance failover capabilities to SAP livecache instances. The
sapinfra module complements the SAP instance clustering with capabilities to cluster SAP
infrastructure software that does not become installed as part of a formal instance, including
saprouter, sapccmsr, and webdispatcher.
HP SGeSAP/LX modular package configuration files are created using cmmakepkg(1) command.
HP SGeSAP/LX modular package configuration changes can be verified using the
cmcheckconf(1) command before they become effective. HP SGeSAP/LX detects erroneous
SAP package configurations and prevents that they get applied with cmapplyconf(1). All SAP
cluster configuration changes are performed as atomic, consistent operations across all the cluster
nodes.
HP SGeSAP/LX modular packages maintain internal versioning, that allows keeping packages
with different versions within the same cluster. In particular, this allows adding new HP SGeSAP/LX
packages for additional SAP instances without the requirement to upgrade any already existing
HP SGeSAP/LX package to the same HP SGeSAP/LX revision simultaneously.
HP SGeSAP/LX package configuration supports three verbosity levels. HP SGeSAP/LX package
logging supports five verbosity levels.
Modular-style SGeSAP-packages support Serviceguard features including package maintenance
mode and Service Live Application Detach.
NOTE: Legacy-style packages created with HP SGeSAP/LX A.03.00 continue to operate in HP
SGeSAP/LX A.6.00 environments. However, new packages must be created as modular-style
packages and the existing packages must be migrated to modular-style packages as soon as
possible. See “Related information” (page 11) section for a reference to the user guidelines to
achieve this.
Automated SAP enqueue replication
Central part of any SAP HA cluster is the handling of SAP enqueue locking services that ensure
data consistency for the application.
A cluster-wide multi-node package of HP SGeSAP/LX keeps track of the status of all clustered
enqueue services and their remote replications and allows to treat them as Serviceguard generic
resources. This enables easy creation of clusters with two or more nodes that run one or more
Central Service/Replication Instance pairs in an automated fashion. The package pairs use a
Follow-and-push failover policy that ensures that SAP Central Service Instances can repeatedly
failover without transaction loss for the SAP applications.
It is not required to install, administer, and maintain several Replication Instances for one SAP
Central Service. HP SGeSAP/LX does not require active-passive setups for multiple replications
and avoids potential error sources that lie in the added complexity of such setups. If possible, the
single Replication Instance gets pushed out to another cluster node after a Central Service Instance
failover and rebuilds replication services at the new cluster node.
HP SGeSAP/LX ensures that administrator-triggered restarts of SAP Central Services do not invalidate
existing replication information. This allows to avoid disrupting business processes due to human
error.
SAP software health monitoring
HP SGeSAP/LX is delivered with a comprehensive set of software service monitors that help to
keep track of the availability and responsiveness of the clustered SAP software services.
Individual monitors are available for SAP Netweaver dispatcher, SAP enqueue service, SAP message
service, SAP replication service, SAP livecache, SAP web dispatcher, SAP gateway, SAP MDM
components, and for the underlying database services.
HP SGeSAP/LX software monitors provide local software restart capabilities in accordance to the
SAP HA certification requirements. The enqueue replication monitor is enabled to perform up to
6