HA

HA admission control is not a capacity management tool.

I receive a lot of questions on why HA doesn’t work when virtual machines are not configured with VM-level reservations. If...
frankdenneman
3 min read

FDM in mixed ESX and vSphere clusters

Last couple of weeks I’ve been receiving questions about vSphere HA FDM agent in a mixed cluster. When upgrading vCenter to...
frankdenneman
48 sec read

Setting Correct Percentage of Cluster Resources Reserved

vSphere introduced the HA admission control policy “Percentage of Cluster Resources Reserved”. This policy allows the user to specify a percentage...
frankdenneman
3 min read

Impact of oversized virtual machines part 2

In part 1 of the series of post on the impact of oversized virtual machines NUMA architecture, memory overhead reservation and...
frankdenneman
2 min read

vSwitch Failback and High Availability

One setting most admins get caught off-guard is vSwitch Failback setting in combination with HA. If the management network vSwitch is...
frankdenneman
1 min read

Impact of host local VM swap on HA and DRS

On a regular basis I come across NFS based environments where the decision is made to store the virtual machine swap...
frankdenneman
3 min read