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4. Parallel Database Clustering
This type of middleware is a special version of host failover middleware, which
supports major parallel database servers like Oracle
®
Parallel Server, Informix
®
XPS, and Sybase
®
MPP. Clustering middleware supports distributed lock
management, a feature that enables parallel database software running on separate
cluster nodes to share access to the same database. If one host fails, the other hosts
can take over its work. Database clusters allow a customer to grow a database
incrementally simply by adding additional nodes. With non-parallel database
servers, the server has to be replaced or an additional server with another database
instance has to be purchased and installed when the capacity of the original
system is exceeded.
The Lightning 9900
™
system has been certified with MC/Lock Manager for
Oracle
®
Parallel Server and Sun
™
PDB for Oracle
®
Parallel Server.
Standard Hot-swap and Redundant Power Supplies
The Lightning 9900
™
Series provides fully redundant power supplies to ensure
uninterrupted power and cooling to all chassis in the system – supporting full system
power in the event of a power supply failure. In the event of such a failure, the power
supply that has failed can be “hot swapped” without disruption to the power subsystem.
Figure 22 - Hitachi
Dynamic Link
Manager
™
automatically
provides path failover
and load balancing for
open systems.
Clustering middleware
supports distributed lock
management.
Hitachi Data Systems
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