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IBM Power System E850C: Technical Overview and Introduction
Using redundant VIOS partitions mitigates that risk. Maintaining redundancy of adapters
within each VIOS, in addition to having redundant VIOS, avoids most faults that keep a VIOS
from running. Multiple paths to networks and SANs are therefore advised. Figure 4-3 shows a
diagram of a partition accessing data from two distinct Virtual I/O Servers, each one with
multiple network and SAN adapters to provide connectivity.
Figure 4-3 Partition using dual redundant virtual I/O servers for connectivity
Because each VIOS can largely be considered as an AIX based partition, each VIOS also
needs the ability to access a boot image, have paging space, and other functions that require
a root volume group or rootvg. The rootvg can be accessed through a SAN, through storage
that is locally attached to a server, or through internal hard disks or solid-state devices. For
best availability, the rootvg for each VIOS should use mirrored or RAID protected drives with
redundant access to the devices.
4.4.3 PowerVM Live Partition Mobility
PowerVM Live Partition Mobility (LPM) allows you to move a running logical partition,
including its operating system and running applications, from one system to another without
any shutdown and without disrupting the operation of that logical partition. Inactive partition
mobility allows you to move a powered-off logical partition from one system to another.
Live Partition Mobility provides systems management flexibility and improves system
availability through the following functions:
Avoid planned outages for hardware or firmware maintenance by moving logical partitions
to another server and then performing the maintenance. Live Partition Mobility can help
lead to zero downtime for maintenance because you can use it to work around scheduled
maintenance activities.
Avoid downtime for a server upgrade by moving logical partitions to another server and
then performing the upgrade. This approach allows your users to continue their work
without disruption.
Avoid unplanned downtime. With preventive failure management, if a server indicates a
potential failure, you can move its logical partitions to another server before the failure
occurs. Partition mobility can help avoid unplanned downtime.
Virtual I/O
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Logical Partition
LAN Adapter
LAN Adapter
SAN Adapter
SAN Adapter
Virtual
LAN
Virtual
SAN
Virtual I/O
#2
LAN Adapter
LAN Adapter
SAN Adapter
SAN Adapter
Virtual
LAN
Virtual
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