What is Vios?
The virtual i/o server is an appliance that provides virtual storage
and shared ethernet adapter capability to client logical partitions.it
allow a physical adapter with attached disks on the virtual i/o sever
partition to be shared by one or more partitions,enbling clients to
consolidate and potentially minimize the number of physical adapters
required.
VIOS is a
special purpose partition that can serve I/O resources to other
partitions. The type of LPAR is set at creation. The VIOS LPAR type
allows for the creation of virtual server adapters, where a regular
AIX/Linux LPAR does not.
• VIOS works
by owning a physical resource and mapping that physical resource to
virtual resources. Client LPARs can connect to the physical resource via
these mappings.
• VIOS is
not a hypervisor, nor is it required for sub-CPU virtualization. VIOS
can be used to manage other partitions in some situations when a HMC is
not used. This is called IVM (Integrated Virtualization Manager).
Depending
on configurations, VIOS may or may not be a single point of failure.
When client partitions access I/O via a single path that is delivered
via in a single VIOS, then that VIOS represents a potential single point
of failure for that client partition.
• VIOS is
typically configured in pairs along with various multipathing / failover
methods in the client for virtual resources to prevent the VIOS from
becoming a single point of failure.
• Active
memory sharing and partition mobility require a VIOS partition. The VIOS
partition acts as the controlling device for backing store for active
memory sharing. All I/O to a partition capable of partition mobility
must be handled by VIOS as well as the process of shipping memory
between physical systems.
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