Understanding The Concept of Vmware Virutal Distributed Switch (vDS)

Virtual Distributed Switch called as vDS is a feature of Enterprise Plus package of the Vsphere Suite. It is managed by vcenter server. It is used for standard settings across all the hosts in a cluster. Even if the VM is moved the port settings and all the configurations are moved with the VM. There are two copies of the configuration
One copy is stored in the vcenter sql database and a local copy is stored in the /etc/vmware/dvsdata.db on the local esxi host. The cached copy is updated every five mins.
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Enable Configure or Disable Hyperthreading on Vsphere ESXi Hosts

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.

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Understanding concepts of VSphere High Availability (HA) – My VCP 5 Notes

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.

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