Information Technology Reference
In-Depth Information
Logical Domains (now Oracle VM Server for SPARC) is a virtualization technol-
ogy that creates SPARC virtual machines, also called domains. This new style of
hypervisor permits operation of virtual machines with less overhead than traditional
designs by changing the way guests access physical CPU, memory, and I/O resources.
It is ideal for consolidating multiple complete Oracle Solaris systems onto a modern
powerful, low-cost, energy-efficient SPARC server, especially when the virtualized
systems require the capability to have different kernel levels.
The Logical Domains technology is available on systems based on SPARC chip
multithreading technology (CMT) processors. These include the Sun SPARC
Enterprise T5x20/T5x40 servers, Sun Blade T6320/T6340 server modules, and
Sun Fire T1000/T2000 systems. The chip technology is integral to Logical Domains
because it leverages the large number of CPU threads available on these servers.
At this writing, that number can be as many as 128 threads in a single-rack unit
server and as many as 256 threads in a four-rack unit server. Logical Domains is
available on all CMT processors without additional license or hardware cost.
Logical Domains creates virtual machines, usually called
domains
. Each appears
to have its own SPARC server. A domain has the following resources:
CPUs
■
RAM
■
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