Tag Archives: vSAN - Page 2

VMware vSAN 6.6 GA - Download Links Available

Today VMware has made the bits for vSAN 6.6 available for everyone to download.

What's New

  • Unicast - In vSAN 6.6, cluster communication has been redesigned to use unicast traffic. Multicast is no longer required on the physical switches to support the vSAN cluster.
  • Encryption - vSAN supports data-at-rest encryption of the vSAN datastore. When encryption is enabled, vSAN performs a rolling reformat of every disk group in the cluster.
  • Enhanced Stretched Clusters with Local Failure Protection - Previously, vSAN's was able to provide a fully active-active, stretched cluster. vSAN 6.6 takes this a step further, allowing for storage redundancy within a site AND across sites at the same time.
  • Site Affinity for Stretched Clusters - A new feature for vSAN 6.6 Stretched Clusters is the ability to configure site affinity.
  • Configuration Assist and Updates - New Configuration Assist and Updates pages allows to check the configuration of your vSAN cluster, and resolve any issues.
  • Resynchronization throttling - IOPS used for cluster resynchronization can be throttled to prevent performance bottlenecks.
  • vSAN Health Command Line Tool - A new esxcli command allows to check vSAN health from the command line (esxcli vsan health).
  • Degraded Device Handling - vSAN 6.6 provides a more proactively stable environment with the detection of degraded and failing devices.

Additional Information

Why you should protect your Virtual SAN Network

As a common best practice you should separate management, vMotion and Virtual SAN traffic from production traffic. This is not only a performance requirement, but also for security concerns. Compared to management traffic which is encrypted and requires authentication and vMotion traffic which is impracticable to eavesdrop, Virtual SAN traffic presents a large surface area to attacks.

This article explains why it is critical to keep Virtual SAN traffic in protected networks and what can happen when you ignore this guideline. I am also explaining how you can detect and monitor such attacks.

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Building a Single-Node VSAN

single-node-vsanI was wondering if it possible to speed up my Intel NUC based ESXi with Virtual SAN. The idea is that compared against vSphere Flash Read Cache, Virtual SAN can use the SSD not only as read cache but also as write buffer. This post explains how you can create a Virtual SAN Datastore on a single ESXi host from the command-line without a vCenter Server.

It goes without saying that this is neither the idea behind Virtual SAN nor officially supported by VMware. It also violates VMware's EULA if you are running Virtual SAN without a VSAN license. To assign a licence you need a vCenter Server and wrap the single ESXi into a Cluster.

My configuration for this test:

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Manage Virtual SAN 5.5 with RVC - Complete Guide

This is a comprehensive guide to manage your VMware Virtual SAN with the Ruby vSphere Console. RVC is an interactive command line tool to control your platform. If you are new to RVC, make sure to read the Getting Started with Ruby vSphere Console Guide. All commands are from the latest vSphere 5.5 Update2 release.

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VMware VSAN on Intel NUC - Mobile Cluster for $2000

Small, silent, transportable and a very low power consumption. That's the Intel NUC. It's not only a great system for Homelabs, or Homeservers - It can also be used to build a portable Virtual SAN Cluster. I ordered 3 NUCs to build a VMware Virtual SAN enabled Cluster.


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PowerCLI Script to Calculate VSAN VSPP Points

VMware includes Virtual SAN in their VSPP program. Unfortunately their vCloud Usage Meter, the tool that helps to create a license report, does not support Virtual SAN by now. I wrote a little PowerCLI script to gather the required information.


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Reuse VSAN Claimed Disks as VMFS Datastore

During a test I used an old disk that has been previously used by Virtual SAN. The disk did not appear during the datastore creation process. I miss a flash drive here:

datastore-creationThe problem is that the disk has not been cleared from it's VSAN configuration. It has still valid VSAN partitions, so the ESXi "claims it for VSAN" what makes it impossible to create a VMFS filesystem.

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Online VMware Virtual SAN Sizing Tool

The new web based Virtual SAN Sizing Tool provides assistance for design considerations for a Virtual SAN infrastructure. Based on given requirement the tool provides full detailed specifications. Input parameters are split into 2 separate sections: Virtual Machine Characteristics and Host Hardware Characteristics.


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VSAN - What does CLOM, OSFS and CMMDS stand for?

With the release of VMware Virtual SAN we have several new acronyms and abbreviations. What does they stand for? I've created a shot list about all abbreviations that might arise around VSAN:

  • CMMDS - Cluster Monitoring, Membership, and Directory Service
  • CLOMD - Cluster Level Object Manager Daemon
  • OSFSD - Object Storage File System Daemon
  • CLOM - Cluster Level Object Manager
  • OSFS - Object Storage File System
  • RDT - Reliable Datagram Transport
  • VSANVP - Virtual SAN Vendor Provider
  • SPBM - Storage Policy-Based Management
  • UUID - Universally unique identifier
  • SSD - Solid-State Drive
  • MD - Magnetic disk
  • VSA - Virtual Storage Appliance
  • RVC - Ruby vSphere Console

VMware VSAN License Calculator

VMware Virtual SAN and its pricing model is now available. The pricing model is very simple and, just like the model for the hypervisor, based on CPU sockets. There is no feature, capacity or scale limit. VSAN has to be licensed on top of the hypervisor and the whole cluster has to be licensed. This implies that you have to license each host in the cluster, even when it does not have any local disks and is only part of the cluster as a VSAN Agent. A more detailed description of VSAN licensing is available here.

I've created a VSAN License Calculator. Just enter the number of hosts and sockets per host in your cluster and it will calculate the total price of all required VMware products. It also includes a license cost breakdown which shows the price for each component separately.


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