VMware Storage: Understand Your Options

VMware provides a variety of ways for virtual machines to access storage. It supports multiple traditional storage models including SAN, NFS and Fiber Channel (FC), which allow virtualized applications to access storage resources in the same way as they would on a regular physical machine. It also supports Software-Defined Storage (SDS) models that allow you to create and scale elastic pools of storage, and centrally manage data protection and data backup.

In this article:

VMware Storage Options

VMware provides several virtualized storage options as part of vSphere, its virtualization platform. vSphere provides two categories of storage models, traditional storage and distributed storage based on the Software-Defined Storage (SDS) paradigm.

Traditional Storage Models Software-Defined Storage Models
  • Local and Networked Storage
  • Storage Area Networks (SAN)
  • Fiber Channel (FC)
  • iSCSI
  • Virtual Disks
  • vSphere VMFS
  • NFS
  • Raw Device Mapping (RMP)
  • Storage Policy-Based Management
  • vSphere Virtual Volumes
  • vSAN
  • I/O Filters

 

vSphere Traditional Storage Models

VMware offers a variety of storage models that use traditional storage protocols, allowing you to easily import existing workloads from a non-virtualized environment.

Show VMware Storage Models
Source: VMware

vSphere offers the following traditional storage options:

  • Local and networked storage—storage devices attached to ESXi hosts
  • Storage Area Network (SAN)—a high-speed network aggregating storage from multiple ESXi hosts. Access to storage on hosts can be performed via:
    • Fiber Channel—a high-speed storage protocol that can use either copper or fiber cable as its transport. Supporting performance from 266 megabits/second to 16 gigabits/second.
    • iSCSI—a high-performance storage protocol using Ethernet connections.
  • Virtual Disks (VMDK)—large physical files stored on physical storage devices attached to the VM. Each virtual disk appears to the VM as an independent SCSI drive.
  • Network File System (NFS)—storage devices mounted remotely using the NFS protocol and hosted on a NAS server.
  • Raw Device Mapping (RDM)—allows guest operating systems within a VM to gain direct access to storage devices.

VM-Level Storage Concepts

On an individual VM, vSphere supports the following types of virtual machine disks (VMDK):

  • Eager zeroed thick VMDK—local disk that is wiped clean of previous data and reserved only for the use of the local VM, not available to other VMs.
  • Lazy zeroed thick VMDK—local disk that is reserved for use by the local VM, but is not wiped clean when the VM is created. The disk may contain old data, which is deleted as new data is written.
  • Thin VMDK—space required for the local VM is zeroed on demand, while unused space on the disk is made available to other VMs via I/O filters.

vSphere supports the following types of physical disks attached to a VM:

  • LSI Logic Parallel—a SCSI virtual controller
  • LSI Logic SAS—the newer serial attached SCSI controller (from vSphere 4.0)
  • VMware Paravirtual—SCSI virtual controller for very high throughput

vSphere Software-Defined Storage Models

In a software-defined storage (SDS) model, virtual machines become storage units that can be elastically provisioned according to vSphere policies.

software-defined storage
Source: VMware

vSphere SDS encompasses the following technologies:

  • Storage Policy-Based Management—a single control panel for all data and storage services, including vSAN and Virtual Volumes, and provisions storage according to application requirements.
  • vSphere Virtual Volumes—manages storage objects packaged into virtual storage arrays. This makes the virtual machine a unit of storage management, comprising one or more virtual disks, which appear to storage hardware as a regular disk drive.
  • Virtual SAN (vSAN)—runs as part of the ESXi hypervisor. Aggregates local and direct-attached storage devices within VM hosts, and creates a single storage pool and share it between all hosts.
  • I/O filters—agents installed on ESXi hosts that provide data services to other machines, including replication, caching, and encryption. This enables each machine to function as part of a distributed storage cluster.

vSphere Storage DRS: Optimizing Storage for Your Cluster

VMware provides, as part of the vSphere stack, a component for intelligently managing storage, both at the virtual machine level and at the network file system level. That component is SDRS, which watches consumption of storage resources in the cluster and can allocate additional resources on demand.

SDRS can either change storage provisioning automatically, or send messages to administrators notifying them that resources are running low or are over-utilized. SDRS provides the following main capabilities:

  • Resource aggregation – groups multiple storage units into a single pool of storage, which becomes a storage cluster
  • Initial placement – defines where virtual disks should be physically stored, and manages storage as a result of operations like create VM, add disk or clone.
  • Load balancing – manages load balancing between storage units based on available disk space and I/O load.
  • Affinity rules – lets you define affinity or anti-affinity between VMs or VMDKs to ensure that disks are collocated with their hosts, or stored separately from hosts.

VMware Storage Made Simple with Cloudian

VMware data centers based on traditional storage infrastructure can be difficult to manage. As virtualized workloads scale up and down, you may find yourself purchasing, installing and configuring physical hard disks, RAID systems, etc.

Cloudian HyperStore is an on-prem, enterprise storage solution that is certified for use in VMware environments, and enables easy scalability from hundreds of Terabytes to Exabytes to support any scale of data. HyperStore supports both traditional storage protocols like SAN and NAS, but at its core it is based on a Software-Defined Storage paradigm, managing dynamic pools of object storage.

HyperStore is used in demanding operator-scale deployments using VMware vCloud Director.

cloudian hyperstore 4000

Learn more about Cloudian’s solutions for VMware storage.

 

Learn More About VMware Storage

VMware offers several virtualized storage options as part of vSphere. It supports many traditional storage models including NFS, SAN, and Fiber Channel (FC), which enables virtualized applications to access storage resources. It also supports Software-Defined Storage (SDS) models that enables you to create and scale elastic pools of storage. 

 

There’s a lot more to learn about VMware storage. To continue your research, take a look at the rest of our blogs on this topic:

 

VMware Data Protection is EOA: 5 Great Alternatives

VMware Data Protection (VDP) was a backup solution offered as part of the vSphere stack. VMware announced End of Availability (EOA) for VDP back in 2017, and End of General Support (EOGS) in March 2020. This means that existing deployments are no longer supported.

 

Since the EOA announcement, VMware users are migrating to third-party backup solutions. There are various available solutions that offer all the capabilities of VDP and more. This article reviews 5 solutions you can use for VMware backup.

 

Read more: VMware Data Protection is EOA: 5 Great Alternatives

 

VMware Backup: Three Approaches

Data backup is a critical part of any data center. That’s why you need to create a solid backup and restore strategy, when operating VMware virtualized resources. This article reviews three backup methods: backing up VMs as physical machines, using a dedicated virtualization backup solution, and backing up VM files.

 

Read more:  VMware Backup: Three Approaches

 

VMware Cloud Director 101: Architecture, Features and Concepts

VMware Cloud Director turns a physical data center, or multiple data centers distributed across multiple locations, into virtual data centers. Within these data centers, Cloud Director enables elastic network provisioning, storage and compute resource provisioning, and allows public cloud providers define services and offer them to users..

 

This article reviews the basic structure and concepts of VMware Cloud Director, and shows how you can easily manage huge storage volumes.

 

Read more: VMware Cloud Director 101: Architecture, Features and Concepts  

 

Getting to Know VMware Site Recovery Manager (SRM)

Disaster recovery is a critical part of any data center. VMware offers a dedicated solution for disaster recovery, as part of the vSphere stack, called VMware Site Recovery Manager (SRM). SRM is a backup automation tool that supports policy-based management of backup programs, and provides a replication technology. SRM can perform orchestration of recovery programs to reduce downtime in times of disasters. In addition, it enables you to run non-disruptive testing of disaster recovery plans.

 

Read more: Getting to Know VMware Site Recovery Manager (SRM)

 

VMware Cloud Services: The Most Popular Services Explained

VMware Cloud services enable you to manage, integrate, and secure applications on cloud resources. VMware Cloud Services work for any cloud service using VMware and can help you centralize the management and maintenance of hybrid or multi-cloud environments.

 

This article reviews use cases for five popular services—Cloud Provider Metering, VMware Cloud on AWS, vRealize Log Insight, vRealize Network Insight Cloud, vRealize Automation, and S3-Compatible Storage for VMware Cloud Director.

 

Read more: VMware Cloud Services: The Most Popular Services Explained

 

See Our Additional Guides on Key Data Storage Topics:

We have authored in-depth guides on several other data storage topics that can also be useful as you explore the world of VMware storage.

Data Protection Guide

Data protection relies on technologies such as data loss prevention (DLP), storage with built-in data protection, firewalls, encryption, and endpoint protection. Learn what is the difference between data protection and data privacy, and how to leverage best practice to ensure the continual protection of your data.

 

See top articles in our data protection guide:

 

Data Backup Guide

Data backup is a practice that combines techniques and solutions for efficient and cost-effective backup. Your data is copied to one or more locations, at pre-determined frequencies, and at different capacities. Learn what a data backup is and how it differs from archiving, what benefits it offers, and what considerations you should take before deploying data backup solutions

 

See top articles in our data backup guide:

 

Hybrid IT Guide

Hybrid IT is a blend of on-premise and cloud-based services that has emerged with the increasing migration of businesses to cloud environments. Learn about hybrid IT, implementation solutions, and practices, and discover how Cloudian can help optimize your implementation.

 

See top articles in our Hybrid IT guide:

IT Disaster Recovery Guide

IT disaster recovery is the practice of anticipating, planning for, surviving, and recovering from a disaster that may affect a business. Learn what is disaster recovery, how it can benefit your business, and four essential features any disaster recovery program must include to be effective.

 

See top articles in our IT disaster recovery guide:

 

Health Data Management Guide

Health Data Management (HDM), also known as Health Information Management (HIM) is the systematic organization of health data in digital form. Learn what is health data management, the types of data it encompasses, unique challenges and considerations for storing Petabytes of health data.

See top articles in our health data management guide:

 

Splunk Architecture Guide

Splunk is a distributed system that aggregates, parses and analyses log data. This article explains how the Splunk big data pipeline works, how components like the forwarder, indexer and search head interact, and the different topologies you can use to scale your Splunk deployment.

 

See top articles in our splunk architecture guide: