Hyper-threading is a neat feature in the latest INTEL NEHALEM series. It allows each physical core to run 2 threads simultaneously which means 4 physical cores and 8 logical cores. Having double the logical processors does not boost the performance by 100% but it just makes processors more efficient and in some cases help to achieve a gain of 20%. But it still plays a great role when deployed in Vsphere Virtual Infrastructure.
Apart from the virtualization of the machines another important thing in the virtual infrastructure is the networking. Proper DNS and routing is required for proper connectivity between hosts, Vcenter and other equipments.
In my previous article Configure NTP on an ESXi Host I explained you how you can configure your ESXi host to synchronize clock from NTP servers but it can never be easy things do break problems do occur. IT industry is not like roaming in wonderland hence it becomes more important to troubleshoot thing rather than to configure things.
Time syncing is very important when it comes to production environment. All the devices must be synced to NTP or a time server so in case of anomalies, breakdowns or crashes or any other problem the logs can be compared.
Before designing a virtual network for the virtual machines it is very important to know the features, terms and options available in the vmware vsphere for the virtual network design. The prime components of a network design are always the switches. So I will start with the switches. The virtual switches present inside vmware vsphere have similar features to physical switches but at the same time there are some differences as well.
VMware VSphere High Availability (HA) is a super cool feature. It is different from the Vmotion. When doing vmotion a running guest is migrated from one ESX host to another ESX host. The condition that should be satisfied for the vmotion is that both hosts should be powered on. In case one ESXi Host fails and we have a production virtual machine running on that host, we wont be able to migrate that to another failover host. This is where the VMWare VSphere High Availability (HA) comes into play. The VSphere High Availability (HA) is a business continuity feature if a host fails and is configured for VSphere High Availability (HA) then the selected machines are started automatically on the another ESXi host.
I got this strange error message when I was configuring the VMware vCentre server appliance in my ESXi server test lab. The message read
“VPXD must be stopped to perform this operation”