5486AdvTech.fm Draft Document for Review October 18, 2004
28 IBM Eserver i5 and iSeries System Handbook
disk pool. As data is written to the production copy of an independent disk pool,
the operating system mirrors that data to a second copy of the independent disk
pool through another system. This process keeps multiple identical copies of the
data.
Through the device CRG, should a failover or switchover occur, the backup node
can seamlessly take on the role of the primary node. The server or servers that
act as backups are defined in the recovery domain. The backup nodes can be at
the same or different physical location as the primary.
When an outage occurs on the server defined as the primary node in the
recovery domain and a switchover or failover is initiated, the node designated as
the backup in the recovery domain becomes the primary access point for the
resource and then owns the production copy of the independent disk pool.
Therefore, you can gain protection from the single point of failure associated with
switchable resources.
Virtualization technology
Virtual technology enables resource sharing in an integrated, flexible computing
environment on a single server. This section discusses key virtual technologies
that are available with each iSeries server.
Virtualization Engine
Virtualization Engine is the name for a technology that describes the ability to
see and manage system and storage resources across a computing
environment. A set of system services includes workload management,
integrated grid services, and a set of tools to help monitor the computing
resource. Services have the capability of workload balancing across different
operating systems within a single server and across the computing network.
Refer to “Product Previews: Open” on page 68 for a preview of this service.
Dynamic logical partitioning
Logical partitioning (LPAR) enhances the role of the iSeries as a consolidated
server. With LPAR, companies have both the power and flexibility to address
multiple system requirements in a single machine.
Server virtualization, a term often used with partitioning, is accomplished on
iSeries through the use of Hypervisor technology. Hypervisor encompasses a
combination of both hardware features and control code. Eserver i5 servers
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