Datasheet

The hosting IBM i partition will experience an increase in the paging of its memory pages as a

result of its hosting role. Monitor and adjust the memory pools using the tips in section “General

Performance Information, Tips, and Techniques” of the Performance Capabilities Reference

manual at: (http://www.ibm.com/systems/i/solutions/perfmgmt/resource.html)

2.3.3 Dual hosting

An IBM i client partition has a dependency on its host: if the host partition fails, IBM i on the client

will lose contact with its disk units. The virtual Ethernet connection would also become

unavailable if the host partition is brought down to restricted state or shut down for scheduled

maintenance or to apply PTFs. To remove this dependency, two host partitions can be used to

simultaneously provide virtual storage to one or more client partitions.

The configuration for two hosts for the same client partition uses the same concepts as that for a

single host described in the “IBM i logical partition (LPAR) hosting another IBM i partition” section.

In addition, a second VSCSI client adapter exists in the client LPAR, connected to a VSCSI

server adapter in the second host LPAR. The IBM i configuration of the second host mimics that

of the first host, with the same number of NWSD and NWSSTG objects, and NWSSG objects of

the same size. As a result, the client partition recognizes a second set of virtual disks of the

same number and size. To achieve redundancy, adapter-level mirroring is used between the two

sets of storage spaces from the two hosts. Thus, if a host partition fails or is taken down for

maintenance, mirroring will be suspended, but the client partition will continue to operate. When

the inactive host is either recovered or restarted, mirroring can be resumed.

2.3.4 IBM i Client partition considerations and limitations

Refer to the topic Considerations and limitations for i5/OS client partitions on systems managed

by the Integrated Virtualization Manager (IVM) in the Information Center at:

http://publib.boulder.ibm.com/infocenter/iseries/v7r1m0/index.jsp?topic=/rzahc/rzahcbladei5limits.

htm. While in this case the IBM i client partition is not being managed by IVM, it does virtual I/O

resources and the limitations outlined in the topic above apply to it.

2.4 Implementing IBM i client paritions with an IBM i host

Installing IBM i in a client LPAR with an IBM i host consists of two main phases:

 Creating the VSCSI configuration in the HMC or SDMC

 Creating the NWSSTG and NWSD objects in the IBM i host partition, and activating the

new client partition

The implementation steps are described in detail in the topic Creating an IBM i logical partition

that uses IBM i virtual I/O resources using the HMC in the Power Systems Logical Partitioning

Guide at: http://publib.boulder.ibm.com/infocenter/systems/scope/hw/topic/iphat/iphat.pdf. Note

that sufficient available capacity is required in the IBM i host partition to create the storage space

objects. When following the detailed implementation instructions, keep in mind the performance

recommendations explained in the “Performance section of this paper.

2.5 Post-install tasks and considerations

2.5.1 Configure IBM i networking

Once the IBM i client partition is installed and running, the first system management step is to

configure networking. There are three types of network adapters that can be assigned to an IBM

i client partition:

 A standard physical network adapter in a Peripheral Component Interconnect (PCI) slot