Tag Archives: vSAN

vSAN 6.6 RVC Guide Part 3 - Object Management

The "vSAN 6.6 RVC Guide" series explains how to manage your VMware Virtual SAN environment with the Ruby vSphere Console. RVC is an interactive command line tool to control and automate 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 vSAN 6.6 version.

The third part explains commands related to the object management in vSAN. These commands are used for troubleshooting or reconfiguration of objects. They also provide an insight on how vSAN works.

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vSAN 6.6 RVC Guide Part 2 - Cluster-Administration

The "vSAN 6.6 RVC Guide" series explains how to manage your VMware Virtual SAN environment with the Ruby vSphere Console. RVC is an interactive command line tool to control and automate 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 vSAN 6.6 version.

The second part explains commands related to vSAN cluster administration tasks. These commands are required to gather information about ESXi hosts and the cluster itself. They also provide important information when you want to maintain your vSAN cluster or configure a stretched cluster:

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vSAN 6.6 RVC Guide Part 1 - Basic Configuration

The "vSAN 6.6 RVC Guide" series explains how to manage your VMware Virtual SAN environment with the Ruby vSphere Console. RVC is an interactive command line tool to control and automate 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 vSAN 6.6 version. The first part explains basic configuration tasks that are required for the initial setup:

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How to silence VMware vSAN Health Checks

A new feature in vSAN 6.6 is the ability to silence Health Checks. In previous versions, it was already possible to disable alerts that are triggered by health checks. Silencing health checks is one step further and enables you to have a clean vSAN health. Silenced checks are displayed with a green checkmark and are marked as "Skipped".

Especially for home labs, where unsupported hardware is used, this is a great feature.

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vSAN 6.6 vMotion Basic Unicast Connectivity Health Check Fails

After upgrading my lab to vSAN 6.6, I noticed that the newly introduced vMotion health check (vSAN Cluster > Monitor > vSAN > Health > Network) showed up as failed for the following checks:

  • Failed - vMotion: Basic (unicast) connectivity check
  • Failed - vMotion: MTU check (ping with large packet size)

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VMware vSAN 6.6 Upgrade Steps

The VMware vSAN 6.6 has been released today. In this post, I am going to run through the 3 steps to upgrade vSAN 6.5 to vSAN 6.6. Upgrading Virtual SAN is a multistage process, in which you must perform the upgrade procedures in the order described here:

  1. Upgrade vCenter Server to version 6.5.0d
  2. Upgrade ESXi Hosts to version 6.5.0d
  3. Upgrade the vSAN on-disk format to version 5.0

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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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