In addition, the vSphere 4. The other editions support up to 4-way virtual SMP. These gains are available on both Windows and Linux guests. Fault Tolerance works only between two systems. It uses a technology called vLockstep to provide protection from system failure with absolutely no downtime.
The vNetwork Distributed Switch spans multiple ESX Server hosts, letting you configure and manage virtual networks at the cluster level. IPv6 support Another enhancement in vSphere 4. Many organizations are planning to move to IPv6. Using vApps, you can combine multiple VMs, their interdependencies, and their resource allocations together as a unit.
You can manage all the components of the vApps as a single unit, letting you power off, clone, and deploy all the vApps components in the same operations. The UI displays the status of the remote updates in real time. The vShield Zones feature lets you isolate, bridge, and firewall traffic across vCenter deployments.
Which are the traffic shaping options available to configure? What is promiscuous mode? I mean, the data will be broadcasted. What is the format for iSCSI addressing? IP Address What are the different types of memory management tricks available under ESX? What is vmmemctl? What is resource pool? What are the use of it? A resource pool is a logical abstraction for flexible management of resources. Resource pools can be grouped into hierarchies and used to hierarchically partition available CPU and memory resources.
Ask about how HA works. VMware HA provides high availability for virtual machines by pooling them and the hosts they reside on into a cluster. Hosts in the cluster are monitored and in the event of a failure, the virtual machines on a failed host are restarted on alternate hosts. Is HA dependent on virtual center Only for Install What is the Maximum Host Failure allowed in a cluster 4 How does HA know to restart a VM from a dropped Host storage lock will be removed from the metadata How Many Fiber Channel targets on Install What is Vmotion ability to move running vm from one host to another What is virtual SMP — when and why should you give a vm multiple vCPUs — part of their answer whould be that best pracrtice is to start with a single vCPU because of you can run into perfomance issues do to CPU scheduling Ask what version of Linux kernel does ESX run if they are truly experienced they should say ESX is not Linux and does not use a Linux kernel — and give them an extra poijnt if they explain that the service console runs a modified version of Red Hat Ent 3 - Vpxa then pass those request to hostd management service on esx server.
When you connect to ESX server directly, you connect to hostd bypass vpxa. You can extend this to a trobleshoot case, where connect to esx see one thing and connect to VC see another. HA issues — because of dns problems, the hosts are unable to communicate together. After releasing the lock its powered on.
When was the last time you called VM Support and what was the issue? Licensing related issues. What was the most performance intensive production app that you supported in VMware and what were the some of the challenges that it posed?
In exchange sharepoint demo project, getting lot of VLAN issues. How would you determine that a perf intensive app is a good candidate? Spefically what tools would you use to identify candidates. Hosts in the cluster are monitored and in the event of a failure, the virtual machines on a failed host are restarted on alternate hosts.
Vpxa then pass those request to hostd management service on esx server. When you connect to ESX server directly, you connect to hostd bypass vpxa. You can extend this to a trobleshoot case, where connect to esx see one thing and connect to VC see another. HA issues — because of dns problems, the hosts are unable to communicate together. VM was not powered up — because the swap file was locked by another host, when I try to power on the vm its not powering up.
After releasing the lock its powered on. What was the most performance intensive production app that you supported in VMware and what were the some of the challenges that it posed? In exchange sharepoint demo project, getting lot of VLAN issues.
How would you determine that a perf intensive app is a good candidate? Spefically what tools would you use to identify candidates. Specifically inside those tools what metrics would you use? What is yor philosophy on how much of the data center can be virtualized? If the interviewer wants max virtualization, but the interviewee is not convinced that this is a good idea, this could be a deal breaker. Just trying to figure out if the candidate is keeping up with this ever changing virtualization market.
I say this because networking is such an important part of VMware implementations and on going support.. Note: if a thick disk is used, a —flat. This is created by the host automatically when powering on a VM and deleted default behavior when powering off a VM. Swap files can remain and take up space if a host failed prior to shutting down a VM properly. A set of best practiced configuration rules, which are can be applied to entire cluster or to an individual host.
So that all the hosts in sync with each other, this will avoid vmotion, drs and ha problems. My ESXi 3. At the moment, 5 of them are complaining that they cannot Power On. I had a look with the data browser.
I have downloaded one of the vmx files and attached it here. Please either tell me what to change in that vmx file, or suggest another approach to get the machines to start. What are the available Storage options for virtual machines? Raw device mappings, VMFS. What are the differences between Virtual and Physical compatibility modes when mapping the Raw Devices to virtual machines?
Virtual compatibility mode—this mode fully virtualizes the mapped device, which appears to the guest operating system as a virtual disk file on a VMFS volume. Virtual mode provides such benefits of VMFS as advanced file locking for data protection and use of snapshots. Physical compatibility mode—this mode provides access to most hardware characteristics of the mapped device.
VMkernel passes all SCSI commands to the device, with one exception, thereby exposing all the physical characteristics of the underlying hardware. In this mode, the mapping is done as follows, when we create a mapping, the configuration stored in a file and that file is stored with the vm files in datastore.
This file points to the raw device and makes it accessible to the vm. Physical mode RDMs, in particular, have some fairly significant limitations:. Virtual mode RDMs address some of these issues, allowing raw LUNs to be treated very much like virtual disks and enabling functionality like VMotion, snapshotting, and cloning. For example, virtual mode RDMs can be used in virtual-to-virtual cluster across physical hosts.
Note that physical-to-virtual clusters across boxes, though, require physical mode RDMs. While virtual disks will work for the large majority of applications and workloads in a VI environment, the use of RDMs—either virtual mode RDMs or physical mode RDMs—can help eliminate potential compatibility issues or allow applications to run virtualized without any loss of functionality. Click here for more — Wintual. You are commenting using your WordPress.
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Notify me of new posts via email. Email Address:. So now you know how vmotion works! And yes, those VMware engineers are definitely some smart people! Mike is the founder of The Geek Pub. A jack of all trades who simply enjoys the challenge creating things, whether from wood, metal, or lines of code in a computer.
Mike has created all kinds of projects that you can follow and build yourself, from a retro arcade cabinet to plantation shutters for your home. Thanks for the info Mike! This is something I have wanted to know for a while.
This is the first explanation of VMotion I can actually understand. Thanks for writing this Mike! Super cool! Some really smart people figured this out. Way smarter than me! How VMotion Works! Define How do you know the cause of these crashes in these cases? Please send me the answer if anyone knows about this, I will update.
ESX servers monitor each other. DRS do not work while VC is down. For HA, only the config is in VC. VC will notice the HA reaction afterwards when it connects to the service consoles the next time. No, Why because all these futures are comes with Virtual Center only. What are the situations which triggers vMotion automatically? Resource Contention between virtual machines DRS Distributed power management Please send me the answer if anyone knows about this; I will update.
This three-part series describes vShield Zones, explains Define How to install it and provides useful management tips. What are the requirement for FT? As a result, ESX Server 3. ESX Server 4. Define However, the new hypervisor does require a bit hardware platform. In addition, the vSphere 4. The other editions support up to 4-way virtual SMP.
These gains are available on both Windows and Linux guests. Fault Tolerance works only between two systems. It uses a technology called vLockstep to provide protection from system failure with absolutely no downtime. The vNetwork Distributed Switch spans multiple ESX Server hosts, letting you configure and manage virtual networks at the cluster level.
IPv6 support — Another enhancement in vSphere 4. Many organizations are planning to move to IPv6. Using vApps, you can combine multiple VMs, their interdependencies, and their resource allocations together as a unit. You can manage all the components of the vApps as a single unit, letting you power off, clone, and deploy all the vApps components in the same operations.
The UI displays the status of the remote updates in real time. The vShield Zones feature lets you isolate, bridge, and firewall traffic across vCenter deployments. What is promiscuous mode? I mean, the data will be broadcasted. What are the different types of memory management tricks available under ESX? What is vmmemctl? What is resource pool? Define what are the use of it? A resource pool is a logical abstraction for flexible management of resources.
Resource pools can be grouped into hierarchies and used to hierarchically partition available CPU and memory resources. How HA works. VMware HA provides high availability for virtual machines by pooling them and the hosts they reside on into a cluster.
Hosts in the cluster are monitored and in the event of a failure, the virtual machines on a failed host are restarted on alternate hosts. What is virtual SMP — when and why should you give a vm multiple vCPUs — part of their answer whould be that best pracrtice is to start with a single vCPU because of you can run into perfomance issues do to CPU scheduling.
What version of Linux kernel does ESX run if they are truly experienced they should say ESX is not Linux and does not use a Linux kernel — and give them an extra poijnt if they explain that the service console runs a modified version of Red Hat Ent 3 —.
Does HA use vmotion? Vpxa then pass those request to hostd management service on esx server. When you connect to ESX server directly, you connect to hostd bypass vpxa. You can extend this to a trobleshoot case, where connect to esx see one thing and connect to VC see another.
HA issues — because of dns problems, the hosts are unable to communicate together. After releasing the lock its powered on. When was the last time you called VM Support and Define what was the issue?
Licensing related issues. What was the most performance intensive production app that you supported in VMware and Define what were the some of the challenges that it posed? In exchange sharepoint demo project, getting lot of VLAN issues.
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