LDOM (Logical Domain ) is called now as Oracle VM Server for SPARC which supports only on T Series SUN Servers. Its uses server virtualization to convert one physical server into many Virtual machines.
Each virtual machine can be run a separate, independent OS and applications. Hardware (like Memory, CPU, NIC and SAN) devices can be shared with virtual Machines. Unlike Solaris zones, LDOMS can run its own operating system with different kernel patch levels. You can also install Solaris 8,Solaris 9 ,Solaris 10 and Solaris 11 on LDOMS. LDOM also provides the OBP for each logical domains but we won’t get that in zones. LDOM also allow to move the resources across the logical domains or virtual hosts exclusively. LDOM also allows you to configure zones under that.
Basic Concept of LDOM or Oracle VM for SPARC:
LDOM is a hardware based virtualization which works on top the hypervisor. To understand better, you should know the type of terms used in LDOM or oracle VM for SPARC.
Each virtual machine can be run a separate, independent OS and applications. Hardware (like Memory, CPU, NIC and SAN) devices can be shared with virtual Machines. Unlike Solaris zones, LDOMS can run its own operating system with different kernel patch levels. You can also install Solaris 8,Solaris 9 ,Solaris 10 and Solaris 11 on LDOMS. LDOM also provides the OBP for each logical domains but we won’t get that in zones. LDOM also allow to move the resources across the logical domains or virtual hosts exclusively. LDOM also allows you to configure zones under that.
Basic Concept of LDOM or Oracle VM for SPARC:
LDOM is a hardware based virtualization which works on top the hypervisor. To understand better, you should know the type of terms used in LDOM or oracle VM for SPARC.
- Control Domain is the place where you are going to install the LDOM software and managing the complete logical domain environment.It used to configure the resources and guest domains
- Service domain provides the various virtual services to guest domains.Virtaul services can be virtual disks,network switches or virtual consoles.Mostly we will be configuring the control domain as service domain too.
- I/O Domains have a direct ownership of PCI Bus.You need to directly map the I/O devices to guest domain to improve the application performance in some cases. There is an another domain called “root domain” and this domain has direct ownership of PCI devcies. So it also called I/O domain.
- Guest domains doesn’t performing any of the above mentioned roles.It jsut runs the operating system instances.
- Control domain and service domain can be run together.But the user application should not be installed on this domain in a order to protect domain stability and performance.
Oracle VM Server for SPARC Components:
SPARC Hypervisor :
SPARC Hypervisor come up with sun4v architecture which runs Hyper-Privileged execution mode which provides virtualized machine behavior where our OS can be installed. T-series servers such as UltraSPARC T1, the T2, T2 Plus, the SPARC T3 , T4 and T5 which is having Hypervisor technologies.
Logical Domain Manager (LDM) :
Logical Domain Manager (LDM) is agent where is only running on control domain, LDM is used to create and managing the Logical domain. Its communicating between hypervisor and Logical Domain (LDOM) for creation and removal of resources of LDOM. currently available of LDM version is 3.1.1
SPARC Hypervisor :
SPARC Hypervisor come up with sun4v architecture which runs Hyper-Privileged execution mode which provides virtualized machine behavior where our OS can be installed. T-series servers such as UltraSPARC T1, the T2, T2 Plus, the SPARC T3 , T4 and T5 which is having Hypervisor technologies.
Logical Domain Manager (LDM) :
Logical Domain Manager (LDM) is agent where is only running on control domain, LDM is used to create and managing the Logical domain. Its communicating between hypervisor and Logical Domain (LDOM) for creation and removal of resources of LDOM. currently available of LDM version is 3.1.1