Library of Congress Cataloging‑in‑Publication Data Marshall, David (David W.) VMware ESX essentials in the virtual data center / David Marshall, Stephen S. Virtualization with VMware vSphere . Migrating a Suspended Virtual Machine . essential datacenter services such as access control, performance. Virtual Data Center Architecture. VMware ESX Server – A production-proven virtualization . 00 Server to provide many essential data center services such.
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availability, and simplifies the virtual data center. VMware vSphere Essentials Kit enables you to virtualize and consolidate multiple application workloads. VMware ESX Essentials in the Virtual Data Center. FULL ACCESS. Full Access: DownloadPDF MB Read online. Flexible and efficient. Bevaka VMware ESX Essentials in the Virtual Data Center så får du ett mejl när boken PDF-böcker lämpar sig inte för läsning på små skärmar, t ex mobiler.
CloudStack identifies these networks by the name of the vSwitch they are connected to. You can use the default virtual switch for all three, or create one or two other vSwitches for those traffic types. If you want to separate traffic in this way you should first create and configure vSwitches in vCenter according to the vCenter instructions.
Take note of the vSwitch names you have used for each traffic type. You will configure CloudStack to use these vSwitches.
We recommend setting it to , the maximum number of ports allowed. In vSwitch properties dialog, select the vSwitch and click Edit. You should see the following dialog: In this dialog, you can change the number of switch ports. This same network will also be used as the CloudStack management network.
CloudStack requires the vCenter management network to be configured properly. Direct-attached storage Direct-attached storage DAS is storage that is, as the name implies, directly attached to a computer or server. DAS is usually the first step taken when working with storage. This configuration is a good starting point, but it typically doesn't scale very well.
Network-attached storage Network-attached storage NAS is a type of storage that is shared over the network at a file system level. This option is considered an entry-level or low-cost option with a moderate performance rating. VMware ESX will connect over the network to a specialized storage device.
And there are a few options in this file that you should be aware of. The added virtualization instructions in the AMD and Intel processors have helped spawn a number of new virtualization platforms since the additional technology has removed one of the barriers of entry into the virtualization market. As stated earlier though, when talking about virtualization, context becomes extremely important. There are several ways to do this, and each has its own set of pros and cons.
In order to make a physical computer function as more than one computer, its physical hardware characteristics must be recreated through the use of software.
This is accomplished by a software layer called abstraction. Abstraction software is used in many software systems, including inside the Windows operating system families. These environments can interoperate or they can be totally unaware of one another. A single environment may or may not even be aware that it is running in a virtual environment.
VMs will almost always house an installation of an operating system e. The guest operating system running in the virtual machine sees a consistent, normalized set of hardware regardless of what the actual physical hardware components are in the host server. Instructions for a VM are usually passed directly to the physical hardware, doing so allows the environment to operate faster and more efficiently than emulation, although more complex instructions must be trapped and interpreted in order to ensure proper compatibility and abstraction with the physical hardware.
In order to better understand a virtualized computer environment, it is beneficial to compare the basic computer organization of a typical physical computer to that of a computer running a virtualization platform and virtualized environments. The arrangement of a typical computer has a set of hardware devices onto which is installed an operating system e.
Inside a computer hosting a virtualization platform, the arrangement may be slightly different because the computer itself has a set of hardware onto which the operating system e. This form of virtualization provides a platform on which one or more virtual machines can be created Software Applications Software Applications Software Applications Operating System Linus, Solaris, Windows, etc. Operating System Linux, Solaris, Windows, etc. Common implementations of server virtualization include: VMware ESX installs and operates directly on the bare-metal of the physical hardware in order to maximize efficiency.
Its hypervisor technology is proprietary. The server virtualization platform installs and runs directly on the physical hardware and is enhanced by Intel and AMD hardware virtualization assist capabilities.
Citrix acquired the technology with the acquisition of XenSource. The company offers both a free and pay version of its solution. Their solution runs directly on the physical hardware and leverages the hardware-assisted virtualization capabilities provided by Intel and AMD processors. Virtual Iron offers both a free and pay version of its software. VMware Server must be installed on either a Linux or Windows host operating system.
The Hyper-V hypervisor is also available as a stand-alone offering, without the Windows Server functionality, for bare-metal installations. And server virtualization can help provide the necessary means for your organization to achieve these goals.
The following is a brief overview of some of the benefits you can expect to achieve with the implementation of server virtualization in your environment as well as an overview of when and when not to use the technology.
Hardware independence makes it easy to move a virtual machine from one physical server to another. Virtualization offers flexibility in creating and managing complex initiatives. It can also help reduce power, space and cooling issues through consolidation. When to use server virtualization: Consolidating multiple virtual servers onto one physical server can bring efficiency to the hardware and raise its utilization safely beyond 70 percent.
Being able to run multiple operating systems reduces the amount of downtime that is associated with constantly having to rebuild servers in order to swap out the operating system. Virtualization can also help a salesperson demonstrate multiple software instances to a customer from a single physical machine.
Software Development, Testing, and Debugging—Because of the strong isolation between the environment and the virtualization platform, it becomes easy to perform software development, testing and debugging. A complex development and testing matrix can more easily and readily be produced. Security Honey Pot—Virtual machines can easily help with setting up a honey pot in your network environment in order to view the threats and attacks that your network or applications may be susceptible to from unscrupulous forces.
[PDF] VMware ESX Essentials in the Virtual Data Center Popular Online
When server virtualization should not be used: Attempting to do so can cause double time slicing and quite frankly, in many cases, would probably prove to be unusable. Many people have reported that it is possible to install VMware ESX inside of a VMware Workstation 6 virtual machine; and while this may prove to be successful, it should probably only be used to learn the technology and not used as any sort of production environment architecture to be sure.
As virtualization platforms continue to progress, this will become less of an issue. As an example, some desktop virtualization platforms have recently started to support the capability of operating some 3-D games. As virtualization continues to catch on and spread throughout the IT industry, this will change. As the technology continues to advance, this problem becomes less of an issue. So what about Emulation and Simulation?
Where do they fit in? Emulation is a concept that allows one environment to act or behave as if it were another environment. This could also be described as sophisticated impersonation. An environment is an execution platform, operating system, or hardware architecture. Common implementations of emulation include: It emulates the arcade hardware for which the games were originally programmed.
It emulates portions of the Windows operating system, but the code executes natively on the x86 processor. This imitation simply accepts pre-defined inputs and provides pre-defined responses. This is arguably the easiest or least complex concept to implement. Simulators are used differently than both emulation and virtualization.
They are primarily used in hard-ware and microchip design and prototyping. By doing this, testing can be done on hardware and microchips yet to be built!
This reduces the costs and risks associated with mistakes being made on hardware and chips before they are fabricated. These are great examples of the capability that simulators provide. Simics is able to run unmodified operating systems using its simulated processors and devices. Summary The use of emulators and simulators have their places, however virtualization is the only technology that enables revolutionary capabilities in the datacenter. The history of virtualization goes back much further than most people realize.
Several significant developments occurred in the early s, in the late s, and the early s. These developments lead to the founding of the two pioneering companies in the x86 server virtualization space, VMware and Connectix. Together these two companies have defined x86 server virtualization and helped pave the way for server consolidation efforts. Both companies have since been acquired VMware by EMC and Connectix by Microsoft but their technology continues to lead to innovations in the computer industry.
These challenges are being met head-on, so hopefully these issues will be solved in the not so distant future. The platform was built and architected to be a production ready, enterprise-class server virtualization product that is feature rich and designed to have the smallest possible overhead thanks to its hypervisor design.
Both products, however, suffered performance loss due to the high overhead that came along with installing the virtualization technologies on top of a host operating system. During early pre-release versions of VMware ESX, it was necessary to install a copy of Red Hat Linux first, then after completing the install, the kernel would have to be replaced with a custom kernel written by VMware.
Indeed, a tedious task to say the least. A hypervisor provides the most efficient use of resources in a virtualization platform because it does not rely upon a host operating system and can minimize the resource overhead. The company wanted to create an enterprise class virtualization platform and realized early on that to be successful, performance and granularity of resource control would be critical components.
At the same time, the new version of VMware ESX also added 4-way Virtual SMP support and increased the virtual memory support of virtual machines to 16GB, a critical support feature for enterprises wanting to use virtual machines on high utilization production class systems. This version provided new capabilities for increased levels of automation, improved overall infrastructure availability and higher performance for mission critical workloads. ESX hosts virtual machines running a broad range of operating systems.
To achieve such wide support, ESX emulates a generic virtual hardware platform. A Phoenix Bios 4. Each virtual machine also has a virtual SVGA graphics card, up to four virtual SCSI controllers supporting fifteen devices per controller, up to two virtual 1.
As discussed throughout the book, there are specific restrictions as to which physical hardware devices are supported by VMware ESX. Today, VMware has the most powerful and mature platform available in the enterprise virtualization space.
With each release of VMware ESX, more and more enterprises are making the decision to implement virtualization in their production environments. VMware is steadily gaining traction in the mission critical and production enterprise data center space by providing a low-overhead, high-performance and mature solution with an ever increasing feature list. While it may look similar to a Linux kernel, it is not.
VMware VCA6-DCV Certification Exam Syllabus
Though there are some similarities. Like Linux, VMkernel loads various system modules, though over time this too has changed from one version of ESX to the next.
ESX version 3 takes a more modular approach than previous builds which allows new devices to be added without requiring a recompile of the VMkernel. Other modules have been removed over time, such as those needed for older and now considered obsolete hardware.
The VMkernel controls and manages most of the physical resources on the hardware, including the physical processors, memory, and storage and networking controllers. The VMkernel includes schedulers for CPU, memory, and disk access, and has full fledged storage and network stacks. However, do not think that the COS is in any way a complete distribution of Linux. It is a limited distribution, and technically, not even Linux at all.
COS runs within a virtual machine and can be considered a management appliance. This feature has been removed from ESXi, as you will see later in this chapter. The VMFS file system addresses control, security, and management issues associated with virtual machine hard disk files. Contrary to conventional file systems that only allow one server to have readwrite access to the same file at a given time, VMFS can leverage shared storage systems to allow multiple instances of VMware ESX to concurrently read and write to the same storage.
It uses a system of on-disk locking to ensure that a virtual machine is not powered on by multiple host servers at the same time. The VMFS cluster file system is now capable of unique virtualization capabilities such as live migration of powered on virtual machines from one host server to another, clustering virtual machines across different physical servers, and automatic restart of a failed virtual machine on one physical server to another.
VMFS has become the premier virtual hard disk file system available within the virtualization community. VMware VirtualCenter VMware VirtualCenter is the central command and control console used in a VMware environment to configure, provision, and manage virtualized enterprise environments. At the time of this writing, VirtualCenter Version 2.
Before getting into the details of VirtualCenter, it is worth mentioning something about database sizing for the management application. This seems to be one of the first questions that get asked when planning a VirtualCenter deployment. The spreadsheet can be found online at http: The calculator will estimate the size of the VirtualCenter database after it runs for a certain period of time. So instead of going into too much detail here, I encourage you to download the spreadsheet and check it out for yourself.
Currently there are five components that make up VirtualCenter. VirtualCenter Management Server is the central control point for all configuration, provisioning and management of the VMware environment. VirtualCenter Database is the storage piece of the equation, used to store all the information about the physical server, resource pools as well as the virtual machines that are managed by VirtualCenter. TIP Good to know for troubleshooting: This is the vmware-vpxa service. You will sometimes find the need to restart that service as well as the mgmt-vmware service on the VMware ESX hosts.
Virtual Infrastructure Web Access allows virtual machine management and access to consoles without the use of the client. Note that this method is extremely limited in its functionality. So now that we know what makes up VirtualCenter, what does this give us in the form of functionality?
VMware vSphere: Cheat sheet
Centralized licensing model VMware has given us the ability to manage all VMware software licenses with an embedded FlexNet licensing server and a single license file. You should have a host based license added to your ks.
This way, once the machine has been built, it can immediately be started and run virtual machines. This is very helpful during a DR test and when your VirtualCenter is a virtual machine. You cannot start the virtual machines without a license server, so this will let you get the VirtualCenter virtual machine up and running as quickly as possible. Deployment Wizard VMware has made the task of creating a virtual machine very easy with an easy to use wizard to make every deployment unique in its environment.
Editable virtual machine templates VMware has provided the ability to save virtual machines as a template stored on shared storage. This gives the ability to step configuration standards for your virtual machines.
Templates also support virtual machine updating and patching. Cloning of virtual machines VMware has provided the ability to clone a virtual machine to make a full backup or deploy when a new server is needed. To have a virtual machine fully loaded and fully patched ready to go will save countless hours of configuration and can lower deployments times to hours rather than days.
Live Migration VMotion VMotion is the ability to migrate a live running virtual machine from one physical host to another with no impact to end users. The way this process works is the entire state of the virtual machine is encapsulated by a set of files stored on shared storage. This is truly the corner stone of VirtualCenter and the Virtual Infrastructure.
Distributed Resource Scheduler DRS DRS will continually monitor your physical hosts in a VMware ESX cluster to maintain balanced utilization across the load on all servers by using VMotion technology to migrate virtual machines from host to host to maintain this balance.
The setting is configurable with different available options from simply recommending a migration all the way to a fully aggressive automated migration policy.
Although this is experimental with VirtualCenter version 2. When the work load increases, DPM will bring the powered-down hosts back online to ensure service level agreements can be met.
This is truly an easy to use and cost effective failover solution. In my testing, the first virtual machine will be back up and running in under 5 minutes. Your mileage may vary depending on the number of virtual machines as well as the setting and configuration of the virtual machines.
This functionality is new to VirtualCenter 2. A simple right click and import machine is all it takes now. Consolidation Plug-in VMware has taken some of the Capacity Planner product functionality and built it into VirtualCenter in the form of a plug-in.
This is new to VirtualCenter 2. Plug-ins leave a lot to the imagination as to the direction things will go with adding functionality to VirtualCenter, especially with 3rd party applications. Using a wizard, the consolidation plug-in will automatically discover physical servers and analyze their performance as well as trigger the conversion of the physical server to a virtual machine. Update manger will automate the scanning and patching of V ESX servers as well as Microsoft and Linux virtual machines.
The feature also reduces downtime through automatic snapshots prior to patching which leaves a rollback option. This has been a well sought out feature and VMware has had multiple feature requests for this option. Ability to Create Custom Plug-ins At the time of this writing, several custom plug-ins have been created, including: VirtualCenter—Physical or Virtual Now that we have taken a look at some of the features in VirtualCenter, the next logical step is installation.
So do we install VirtualCenter on a virtual machine or on a physical server? TIP Speaking of the Community Forum, it is worthwhile to say that this is a fantastic resource to ask questions and get feedback from your peers.
If you have a problem with a VMware product, chances are you will get an answer or find out how to do something there faster than any other means available. To virtualize VirtualCenter or not, that is the question. There is no right or wrong answer here and both answers have their own pros and cons. One of the biggest reasons to use VirtualCenter in a virtual machine would be quite simply—High Availability. VirtualCenter is the configuration point for High Availability but is not required to make it work.
If you have VirtualCenter as a virtual machine and the VMware ESX server that it is running on fails and crashes, VirtualCenter will go down but the High Availability option will take over and restart the downed virtual machines on the other hosts.
DATA CENTER VIRTUALIZATION TOPICS
You can give VirtualCenter the highest priority for the restart and know that it should come up first. The recovery time for VirtualCenter should be quick enough, depending on what type of alert system you have in place, before you have the opportunity to check on things. Another reason would be the ability to snapshot the virtual machine before any patches or upgrades are deployed, which will give you a fall back option. Another benefit to note: If you are using any type of SAN replication to another site that has VirtualCenter running in a virtual machine, this will mean that VirtualCenter will be replicated to the secondary site and will be immediately available.
For example if the backend storage was to fail, this would not be caught by HA unless the physical host server went down. Another thought on running VirtualCenter in a virtual machine: The databases used for VirtualCenter, both SQL and Oracle, are transactional databases that sometimes have issues after hard crashes.
A worst case scenario would be loss of transactions with the possibility of database corruption. One way to help overcome this would be to have local backup copies of the database to be able to restore if needed. While not a perfect solution, it would help if this situation were to arise. This is a very easy question if you only have one datacenter or single central point for your environment. If you have multiple geographic locations operating with VMware ESX servers, your decision is a little more difficult.
The main thing to really consider when making this decision is the available bandwidth between the site with VirtualCenter and the remote site with the VMware ESX servers.
It is not the link size or the size of the pipe that really matters but the amount of available bandwidth between the sites. This is an important thing to remember, so say that with me one more time.
Setting up multiple VirtualCenter server environments is as easy as replicating what you have done in one site over again as needed. If the Windows server is part of a domain, VirtualCenter can either use local account or domain account authentication to assign rights in VirtualCenter. When configuring account access in a VirtualCenter installation that is part of a domain environment which has thousands of users, the client has been known to hang while searching through all of the accounts.
An easy way to get around this is to create local groups on the Windows server, and then assign permissions to the local groups. To use this feature you will simply need to edit the shortcut used to launch VirtualCenter and then append this on the end after the quotes.
A new product was born. Keep in mind, this is a rumor and should be treated as such, but it does leave you wondering. Ok, that statement is not entirely true. With all of the previous releases of VMware ESX, patches have primarily addressed the security vulnerabilities with the Service Console.
This plays a significant part in the less patching, longer uptimes mantra. With ESXi being factory loaded, by simply configuring the IP address, adding the server to VirtualCenter, and completing configuration, ESXi hosts can deployed quickly, easily, and in record time.
Larger organizations that have been using Virtual Infrastructure for some time, may not adopt ESXi as quickly. This could be caused by the automated deployment and configuration techniques already developed for use with VMware ESX 3. Many VMware administrators use these methods to deploy, configure, patch, update, and modify an ESX installation. In the past, this has caused the system to freeze or become unresponsive. This type of custom scripting can save someone a great amount of time in doing administrative tasks that need to be done from the command line to multiple ESX servers.
For reasons such as this, many companies with large scale virtualization deployments may not be ready to switch methodologies quite yet.
When it becomes commonplace to deploy OEM systems with ESXi embedded, as well as have the hardware monitoring pieces in place, ESXi will have a better chance of adoption in the enterprise. This is because a disaster recovery site typically requires the ability to be brought online quickly and easily. ESXi embedded could be brought up quickly and easily.
In a hot site disaster recovery configuration, servers with ESXi installed, or embedded, require little maintenance due to the fact that patching is not required as often as VMware ESX 3. First and foremost, the IP address should be configured. Secondly, from a security standpoint, the root account has no password assigned to it, so a root password should be assigned.
With this release, an interesting thing to note is that the default network settings create only one virtual switch, or vSwitch0, and it only has two default ports: VM Network for the virtual machines 2. Management Network Portgroup. For the last seven years, the product has evolved to become the most powerful, stable, and scalable commercial server virtualization platform on the market today.
VMware ESX provides strict control over all of the critical system resources, and it is this granular control combined with native SAN support that helps to provide a solution to a wide range of problems in the enterprise today.
VirtualCenter provides a central management point of control for the entire virtual infrastructure. VirtualCenter is the heart of a virtual infrastructure implementation. VirtualCenter takes care of the management, automation, resource optimization and high availability in the virtual environments. By providing the ability to run plug-ins, coupled with a framework for the way tools and programs are added to virtual infrastructure, VMware has embraced the school of thought that users can add appropriate tools, open-source or third-party, to better manage their environments.
So far, these plug-ins have worked as advertised. We have also gone over the options that are available when installing VirtualCenter and tried to answer whether we should install VirtualCenter on a physical box or in a virtual machine? And how do we best install VirtualCenter when we have different geographical locations to manage? All in all, you should now have a good understanding of the basic components that make up VirtualCenter.
Later in chapter 10 we will go into more details on the advanced features that are available in VirtualCenter. All other functionality is the same. ESXi is the most secure of its predecessors and looks to be the direction that VMware wants to take virtualization to in the future. One thing is for certain, we are still in the infancy stages of virtualization and the best is yet to come.
While there is a clear buzz around the term virtualization right now, the term and the technology is still new to many people. It has actually been around for more than 40 years. Virtualization is the act of hiding, or masking, resources to appear different than they actually are.
Multitasking allows one or more CPU s to manage a single operating system and one or more applications. Console, and the VMkernel. Because VMware ESX is designed to be a highly efficient virtualization platform, VMware has a stringent list of approved systems that are eligible to receive official support.
Additionally, as new server models are released by manufacturers, they are evaluated to determine their operational effectiveness in running ESX. As new versions and builds are released, older hardware that may have previously been on the HCL may no longer remain on the list. For VMware ESX to efficiently or effectively perform its task of virtualization, the physical host server must be able to provide ample CPU, memory, storage and networking resources.
CPU Resources CPU resources are provided by physical systems having multiple processors with single, dual or quad processor cores. These cores provide the capabilities to execute the instructions of the VMware ESX operating system, known as the VMkernel, as well as the instructions from any of the virtual CPUs that the VMkernel presents to virtual machines. In some instances, there are systems listed on the HCL that are supported but only with specified processors. The HCL denotes any special cases for each type of host system and processor combination.
VMware ESX 3. This is a minimum supported requirement, but not an actual limitation. As virtualization technologies have come to the forefront of the information technology sector, processor manufacturers have begun to play an important part in the capabilities of virtualization technologies.
Many VMware administrators argue that the amount of physical RAM plays a crucial role in the performance of virtual machines. A good rule of thumb when configuring a physical system is to not fully populate the server with smaller sized memory modules.
Doing so limits the ability to add more memory to the host server down the road when you need to gain a higher consolidation ratio. As an example, if you have the need for a 16GB server, and your physical host can accommodate up to 32GB, it might prove more beneficial to configure the system with four 4GB memory modules as opposed to using eight 2GB sticks.
This should be thought out carefully, as often times, memory costs could prove to be quite expensive. Virtual disks can reside on local or remote storage, as long as the ESX host is aware of it. In a multi-host configuration, when leveraging VirtualCenter, storage must be shared across multiple ESX hosts simultaneously.
At the time of this writing, the current HCL for storage devices can be found here: Storage presented to VMware ESX can be any combination of a single drive, multiple independent drives, or multiple drives configured in one or more arrays. Another good rule of thumb to follow is when creating arrays, the more drives you have in an array, generally equates to better performance.
Networking resources are provided by Ethernet adapters and other network equipment. Physical adapters in the ESX host can be configured in several methods to provide redundancy, network flexibility, as well as better accommodate network traffic. The abilities of virtual networking will be discussed further in Chapter 8—Networking. As an interface, the SC is a text based console that gives administrators the ability to configure operating parameters for the ESX Server, view system utilization statistics, accept instructions from the Remote Command Line Interface CLI , as well as run local scripts and remote scripts that grant flexibility for the configuration and usage of ESX Server.
When the host system initially starts, the SC is loaded. During the boot process, the SC hands off the role of operating system to the VMkernel. This distribution is based on the BusyBox project. The VMkernel The VMkernel is hypervisor code, coupled with device driver modules, and designed to provide the virtualization layer. Because the VMkernel takes over the operation of the physical host, it could be called the main operating system for ESX.
All physical resources are controlled by the VMkernel. Through share based priorities, the VMkernel provides resources to the SC and guests. This is because of the total CPU shares allocated, which in this case, is With each guest and the SC configured equally, they each have the same opportunity to consume CPU resources.
Share priority is also configured for memory, disk and network resources. In addition to resource allocation per share configuration, the VMkernel allows for resource reservations and limits of CPU and memory resources. This can be referred to as Virtual Machine Ready Time, or the time a guest will have to wait before it can be scheduled for CPU resource allocation.
Many factors can determine the Ready Time, including total CPU utilization, number of guests, types of processes running in the guests, and number of vCPUs a guest has configured. It is easy to see how the total CPU utilization and number of guests are factored in, but how do the types of processes and numbers of vCPUs play a factor?
If a process in a guest executes and ends, Ready Time can be low; but if a process immediately spawns another process, the Ready Time could potentially be high. Also, if a guest has 2 or 4 vCPUs configured, a number of physical cores equal to the number of vCPUs have to be available for scheduling.
The VMkernel has a very unique feature that allows for over commitment of memory resources. By utilizing a technique referred to as Transparent Page Sharing, the VMkernel will keep a single copy of memory instructions that several guests have in common, rather than a copy for each guest. To the guest, this process is transparent. However, if the memory page changes for a single guest, a copy of the original is made and then presented to the guest where the memory page changed.
This works very well when many guests are running the same operating system and have the same applications or services running. To guests, network access is provided through virtual switches and virtual network interface cards NICs. The virtual switches act in virtually the same manner as physical switches external to the ESX server. These virtual switches provide various features that many enterprise level physical switches have, including the Through installation of VMware Tools in the guest, this gets upgraded to a VMware Accelerated Ethernet adapter, a paravirtualized adapter that is aware that it is in a virtual environment.
Because this virtual adapter is aware of the virtualization layer, it can operate more efficiently and much more quickly. In bit guests, the default virtual adapter looks like an Intel e Ethernet adapter, much in the same way the AMD Lance adapter looks to a bit virtual machine.
This adapter type can be used in both bit and bit environments. This plays an important role in the ability to migrate virtual machines easily from one VMware ESX host to another. The core component, the VMkernel, could not be as successful as it is without the appropriate hardware and the Service Console playing their parts. That means, unlike some other virtualization platforms, VMware ESX is its own operating system with its own kernel.
It is essential to have a well-developed deployment plan in place to successfully build a production system using server virtualization technology. Before the project is implemented, a solid understanding of the project is required. This understanding is realized by learning the issues and considerations specific to server virtualization, defining the use case, obtaining the specific requirements, and planning the deployment. By taking the time to properly plan and document the project, the implementation will have a much higher degree of success and much less risk.
This chapter covers many of the considerations which affect the design and implementation of VMware ESX. It is important to be aware of the many issues regarding hardware compatibility, software licensing, capacity, scalability, and many other factors which affect decisions about hardware, software, and outside services. Planning for Deployment Hardware Selecting the hardware necessary for a server virtualization deployment may seem like an easy task at first.
But, after digging into the details, it soon becomes evident that there are many factors at work. The difficulty lies in balancing the cost, capabilities and compatibility, referred to as the 3 Cs. Cost and required capabilities should be documented in the Use Case and Requirements Documents. Compatibility is a derivative of the requirements put forth by your virtualization platform, in this case, VMware ESX. It can be easy to take your server architecture into the wrong direction by losing focus on any one of the 3 Cs.
This solution would not be very useful as it could probably support no more than two or three virtual machines, even though it is very inexpensive. The virtualization instructions in newer processors will ultimately offer more capabilities to the virtualization environment, further justifying their cost. For the reasons illustrated above, it makes sense to try and balance out cost versus capability needs in regards to server hardware.
Careful attention must be exercised to ensure that all hardware components are compatible and device drivers are available. This includes chipset drivers, disk controller drivers, network adapters, SAN host bus adapters, etc. It is important to consult these guides before making a download or before identifying and earmarking existing equipment for the project.Memory pages with and without transparent page sharing.
Now let's get back to our Free E-books collection. FC is the most expensive solution because it involves building a specialized storage architecture and requiring an investment in HBA cards, FC switches,small form-factor pluggable SFP ports, and cables. Operation costs are clearly lower than with internal solutions, and users always have access to the most recent software version. VMware ESX 2. There are two types of baselines: Hardware Independence Provision or migrate any virtual machine to any physical server.
The planning mode is interesting during a backup period, for example; it is not necessary to move the virtual disks. The replication of local storage on another ESXi server ensures redundancy if a host server is out of service.