Choosing a Virtualization Technology in Software Maker Code 128 Code Set A in Software Choosing a Virtualization Technology

7. use software barcode standards 128 printer tobuild code128b with software upc barcode Choosing a Virtualization Technology Architects choosing virtu alization technologies to meet an application s requirements take all of the previously mentioned factors into consideration, mapping requirements onto the combinations of technologies that best meet them. The following sections describe the virtualization technologies under discussion in this context..

7.1.1 Hard Partitioning and Dynamic Domains As described in 2, Hard Partitioning: Dynamic Domains, Dynamic Domains are a feature of the Sun SPARC Enterprise M9000 servers providing isolated hardware environments, each of which runs its own copy of the Oracle Solaris operating system. This technology has the following strengths:. Best fault isolation. No Software Code 128 Code Set A failure in one domain or in its infrastructure can affect another. Other solutions carry with them the risk that a failure occurring in one VE will affect other VEs, perhaps even causing them all to halt.

Security isolation. A security penetration or compromise in one domain has no effect on other domains. Complete compatibility in every respect with non-domained environments.

There is no concern about incompatibility or non-supportability of software. Native performance compared to non-domained environments. There is no virtualization layer.

The CPU code path of an application is not elongated by virtualization, and no additional rmware is needed to assist with virtualization. This advantage, compared to software hypervisors, is greatest for I/O intensive applications. However, domain scalability is limited by hardware capabilities.

The highest scalability is provided by Sun M9000 systems, which currently can have a maximum of 24 Dynamic Domains.. Completely separate Oracl e Solaris instances. Each instance can potentially have its own OS version, patch levels, and maintenance windows without any con ict or interference. Management of a single domain is the same as management of a single system.

This is similar to hypervisor solutions, but is often an advantage compared to OS virtualization (OSV). No extra license fees needed. This technology is included with all domaincapable systems.

Some hypervisors require a fee for use, or a fee for support in addition to support fees for the guest operating systems. Well-established and -accepted history. There is more than a decade of deployment and experience with hard partitioning in the SPARC product line.

. 7.1 REVIEW OF STRENGTHS AND LIMITATIONS Dynamic Domains are widel y deployed in enterprise environments, especially for large applications where scale and the highest degree of isolation and availability are necessary for a relatively small number of vertically scaled virtualized environments.. 7.1.2 Oracle VM Server for SPARC As described in 3, Orac le VM Server for SPARC, Oracle VM Server for SPARC (previously called Logical Domains or LDoms) is a SPARC virtual machine capability available on chip multithreading (CMT) servers. Like Dynamic Domains, each domain runs its own instance of Oracle Solaris. This technology offers several advantages:.

Strong fault isolation. A Code 128 Code Set A for None software failure in one Logical Domain cannot affect another Logical Domain, and domains are insulated from failure of CPU threads and other hardware resources assigned to other domains. The fault isolation characteristics of Logical Domains are better than those of both software-based hypervisors and OSV as they permit redundancy with , multiple service domains.

Nevertheless, this level of fault isolation is not as good as that offered by hardware partitioning, especially when shared I/O resources are in use. Even so, the level of fault isolation available with Logical Domains is appropriate for almost all workloads. Security isolation.

A security penetration or compromise in one domain has no effect on other domains. Logical Domains can be used to store sensitive data. An extremely high level of compatibility with non-domained environments.

Only a few incompatibilities exist, such as the speci c behavior of a virtual disk or network device, as documented in the current version of the Logical Domains reference material. Except for those differences, software performs the exact same steps as on a standalone system. Native CPU performance compared to non-domained environments.

I/O performance does suffer under shared-I/O con gurations, which can reduce scalability for some workloads. CPU threads are assigned to each Logical Domain, so scalability is limited by the number of available threads on the CMT server model. Logical Domains premiered on the Sun Fire T1000 and T2000 (no longer available), which had a single CPU chip with 8 cores and 4 threads per core, for a total of 32 addressable CPU threads; thus at most 32 domains were possible, including the Control Domain.

Newer products such as the Sun SPARC Enterprise T5440 Server can run as many as 128 Logical Domains per system..
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