Question

1) In a Windows clustering in a virtual environment, what are the 3 types of cluster configurations? ( 1 point)

2) Why would you use clustering?  ( 1 point)

3) Define "role" ,"priviledge"and "permission" in the ESXI/vCenter Server security model. ( .5 points each)

4) Name and Describe the 3 vSphere storage presentation models  ( .5 points each)

5) How does vSphere use shared storage?  ( 1 point)

Answer 1

1. Fail-over Cluster, Load-balancing Cluster and HIGH Performance Computing Cluster.

2.Goal of clustering is to determine the intrinsic(natural) grouping in a set of Unlabeled data. It is an unsupervised learning (i.e. there is no output variable to guide the learning process) data is explored by algorithms to find pattern. opposed to supervised learning where your existing data is already labeled and you know which behaviour you want to determine in the new data you obtain , unsupervised technique don’t use labelled data and the algorithms are left to themselves to discover structures in the data.

3.Roles:Roles are sets of privileges. Roles allow you to assign permissions on an object based on a typical set of tasks that users perform. Default roles, such as Administrator, are predefined on vCenter Server and cannot be changed. Other roles, such as Resource Pool Administrator, are predefined sample roles. You can create custom roles either from scratch or by cloning and modifying sample roles.

Privileges:Privileges are fine-grained access controls. You can group those privileges into roles, that you can then map to users or groups.

Permissions:Each object in the vCenter Server object hierarchy has associated permissions. Each permission specifies for one group or user which privileges that group or user has on the object.

4.   

5.The protocols used for vSphere Shares Storage are iSCSI and NFS, both of which are natively supported in vSphere. The performance of NFS and iSCSI are similar, but both can vary depending on a variety of factors including the data storage device characteristics, network speed/latency and host server resources. Since both protocols use software built into vSphere to manage the storage connections over the network there is some minimal CPU resource usage on the host server as a result.

No extra hardware is required on a vSphere server to connect to a shared storage device using iSCSI or NFS, but it is recommended to have a dedicated network for this traffic. This includes dedicated NICs in the host server as well as a dedicated network switch that is isolated from the rest of the normal virtual machine network traffic. Additionally for iSCSI there are special network adapters (hardware initiators) available that have a TCP/IP Offload Engine (TOE) in them that offloads the iSCSI protocol processing from the host server which reduces the CPU overhead on the host.