Tuesday, January 29, 2013

vSphere 5 components

vSphere 5 components and features;

Vmware ESXi : Well, this is the physical part of vSphere. The virtualization OS installed in  in physical servers and bastracts the physical resources of the server and distributes them across VMs.

VMware vCenter : It is the vsphere centralised management software. It is essential for configuring and managing the full potential of vSphere say HA, DRS etc

vSphere client: A client software that lets users connect remotely to Vmware ESXi and vCenter

vSphere web client: A web interface that allows users to connect remotely to vCenter client or ESXi

vSphere SDKs: Provides standard interfaces for VMware and third party solution to access VMware vSphere

VMFS : A high performance cluster file systems for ESXi virtual machnes

vSphere virtual SMP: Enables single virtual machine to use multiple physical processors simultaneously

vMotion: Enables migration of virtual machines from one datastore to another without service interruption*

vSphere HA: If the host ESXi fails, the affected virtual machines are restarted on other available servers with spare compacity

vSphere DRS: Distributed resource scheduler balances the computing capacity across vSphere clusters. DPM (Dynamic power 

Storage DRS: Allocates and balances storage capacity and I/O dynamically across colections of datastore. This includes management capabilities that minimise the risk of running out of space and risk of I/O bottlenecks that slow down the performance of virtual machines

vSphere FT: Provides continuous availability by protecting a virtual machine with a copy. When this feature is enabled for a virtual machine, a secondary copy of the original, or primary, virtual machine is created. All actions completed on the primary virtual machine are also applied to the secondary virtual machine. If the primary virtual machine becomes unavailable, the secondary machine becomes immediately active

vSphere Distributed switch: A virtual switch that can span multiple ESXi hosts, enabling significant reduction of on-going network maintenance activities and increasing network capacity. This increased efficiency enables virtual machines to maintain consistent network configuration as they migrate across multiple hosts.

Host profile: A feature that simplifies host configuration management through user-defined configuration policies. The host profile policies capture the blueprint of a known, validated host configuration and use this configuration to configure networking, storage, security, and other settings across multiple hosts. The host profile policies also monitor compliance to standard host configuration settings across the datacenter. Host profiles reduce the manual steps that are involved in configuring a host and can help maintain consistency and correctness across the datacenter.

Host profiles are also a component of vSphere Auto Deploy. The concept of an autodeployed host means that vCenter Server owns the entire host configuration and it is captured within a host profile.
 Certain policies require user input to provide host-specific values. To support Auto Deploy for host profiles, an answer file is created that contains the definitions for those policies.

*vMotion is not supported across datacenters

Saturday, January 26, 2013

Unable to connect to sql instance "mssqlserver"


Sql server 2008 R2 standard installed with default instance. The default instance name is "mssqlserver".


While trying to connect to instance name using servername\mssqlserver from server management studio, an error is thrown and user is unable to connect .


Reason, it turns out to be that you cannot connect to the default instance by its name mssqlserver.For some strange reason, it is not allowed!!!!


You can connect using the server name alone. Or if you are trying from the machine where sql is installed,you can connect to the local instance.Or else if your application demands a  "servername\instance format,you could run the sql installer once more and create a named instance


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Cloud Solutions expert with 17+ years of experience in IT industry with expertise in Multi cloud technologies and solid background in Datacentre management & Virtualization. Versatile technocrat with experience in cloud technical presales, advisory, innovation , evangelisation and project delivery. Currently working with Google as Infra modernization specialist, enabling customers on their digital transformation journey . I enjoy sharing my experiences in my blog, but the opinions expressed in this blog are my own and does not represent those of people, institutions or organizations that I may be associated with in professional or personal capacity, unless explicitly stated.

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