Recent Posts

DRS Migration Thresholds

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One of the things that make DRS so elegant is that is so simple to configure. There are not many knobs that an administrator needs to turn when enabling DRS, and for a majority of environments the default settings do not need to be changed. For other environments changing the DRS migration threshold may provide Read more...

VMworld 2016: Availability and Resource Management Session Guide

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VMworld 2016 US continues to highlight why vSphere is the unparalleled platform for trusted business applications when guaranteed performance and availability are crucial to business success.  We are continuing to evolve the vSphere platform to make it possible for enterprise and managed service providers to provide higher SLAs, while simplifying the configuration and operations overhead. Availability sessions Read more...

New Fling: DRS Doctor

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DRS is a very powerful vSphere feature that has been around for years. It’s constantly monitoring host performance to ensure that VM demand is satisfied. When DRS determines that another host in a cluster could better suit a VM, a migration recommendation is generated, and the VM will vMotion to another host. DRS looks at Read more...

Load Balancing vSphere Clusters with DRS

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Recently, a customer reported that DRS was not working to load balance the cluster. Under normal circumstances, a minor imbalance is nothing to be concerned about. This is because the main objective for DRS is not to balance the load perfectly across every host. Rather, DRS monitors the resource demand and works to ensure that every Read more...

Maintenance Mode Improvements in vSphere 6.0 Update 2

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vSphere 6.0 Update 2 has launched and with it comes a very simple change with the way that VMs and Templates are evacuated from hosts that enter Maintenance Mode. In all prior versions, when a host enters Maintenance Mode, DRS will evacuate the host by placing all the running VMs, powered off VMs, and the Read more...

DRS Keeps Admins Happy

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DRS is not just about keeping VMs happy.  DRS has many other operational benefits that keep your admins happy too. Let’s dive into the top ways that DRS makes the day in the life so much better for the vSphere admin. Read more...

SIOC: I/O Distribution with Reservations & Limits – Part 2

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Part 1 of this series explains the new reservation capabilities of the ESXi storage scheduler in vSphere 6.0 called mClock.  That article explains how to calculate the number of entitled IOPS during times of contention.  This article will expand on that topic with a couple new scenarios.  The previous article assumed that all the VMs were evenly consuming the Read more...

Web-based Management for the VCSA is Back!

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When vSphere 6.0 launched, there was a celebration. But one beloved feature didn’t make it to the party: The vCenter Server Appliance Management Interface, or more fondly known as the VAMI. The VAMI was the administration web interface included with previous releases of the VCSA that was used to perform basic administrative tasks to the Read more...

SIOC: I/O Distribution with Reservations & Limits – Part 1

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The mClock scheduler was introduced with vSphere 5.5 Storage I/O Control (SIOC) and laid the foundation for new capabilities for scheduling storage resources.  vSphere 6.0 expands upon these capabilities and adds the ability to reserve IOPS, providing even more flexibility and control when delivering storage services to virtual machines.  However, this new capability introduces new Read more...

VM Component Protection (VMCP)

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vSphere 6.0 introduces a powerful new feature as part of vSphere HA called VM Component Protection (VMCP). VMCP protects virtual machines from storage related events, specifically Permanent Device Loss (PDL) and All Paths Down (APD) incidents. Read more...