Virtualization Chapter 8

Storage virtualization is:

Abstracting of the resources to the virtual machines

What file system does Hyper-V use for storage abstraction ?

CSV (Cluster Shared Volumes)

A technique that storage vendors use to reduce data blocks and save disk space by storing only one copy of a duplicated data block.

Deduplication

_________________ is a storage capability that removes duplicate chunks of data and replaces them with pointers back to a single original item.

Deduplication

_____________is disk storage internal to the host system, managed by the storage controller.

Direct attached storage

A single file system is striped in pieces across multiple disks, and when data is written or red back, the multiple drives can work in tandem, significantly decreasing the throughput time.

Disk Striping

A virtual host connects to storage resources only through a specialized storage controller called a Host-Bus Adapter (HBA).

False

Disk mirroring is a storage technology that deals with how data is spread across multiple disks for both increased availability and improved performance

False

Storage utilization in a virtual environment requires planning for significant overhead due to the hypervisor's activity between the storage resources and the virtual guests.

False

There are currently no technologies available that can manage storage IO to ensure that specific virtual machines will receive adequate bandwidth in the event of contention.

False

A SAN usually connects via a specialized controller, sometimes called a _______________.

Fibre-channel Controller (FCC)

Deduplication technology can work with all of the following data entities except:

File systems

A hardware device that connects a computer to either a network or a storage network. Originally associated with Fibre-Channel connectivity

Host-Bus adapter (HBA)

One of the primary reasons for poor performance in a virtual environment is due to:

Lack of adequate storage IO throughput

A physical card that connect the computer to the network.

NIC (Network Interface Controller)

A disk storage device that is connected to a computer through a dedicated storage network or through the NIC, a physical card that connects the computer to the network.

Network attached storage arrays (NAS)

Data storage virtualization technology that combines multiple physical disk drive components into one or more logical units for the purposes of data redundancy, performance improvement, or both.

RAID

____________________ is a storage technology that deals with how data is spread across multiple disks for both increased availability and improved performance.

RAID

Presents storage directly to a virtual machine and bypasses a hypervisor.

Raw Device Mapping

Virtual machines can bypass the hypervisor and connect directly to a physical device by using ___________.

Raw device mapping (RDM)

__________is a physical processor card that is part of a computer's hardware that manages the direct attached storage (DAS).

Storage Controller

Usually connects via a specialized controller, sometimes called a Fibre-Channel Controller (FCC), or a Host-Bus Adapter (HBA)

Storage area network arrays (SAN)

Once disk space has been allocated, it is removed from the usable storage pool. Consuming all available disk storage.

Thick provisioning

Name of the process that can be used to create a storage space that is larger than the available capacity.

Thin provisioning

Data storage method or system consisting of two or more storage media types.

Tiered Storage

In a virtualized storage environment, a VM can "see" a SCSI device even though no physical equivalent exists

True

Most storage best practices translate well from the physical environment to the virtual environment.

True

What file system does VMWare use for storage abstraction ?

VMFS (Virtual Machine File System)

Virtualization hosts can use all of the following expect

Virtual Network Storage arrays

What file system does Xen use for storage abstraction ?

XFS

What is different about the Xen model of storage virtualization from the VMware model?

Xen uses a DOm0 device driver. Hypervisor is bypassed because Dom0 is what is connected to the storage devices.

Describe VMwares vSAN

vSAN is enterprise-class, storage virtualization software that, when combined with vSphere, allows you to manage compute and storage with a single platform.