Too frequently I hear the expression n+1 as a model for ESX clusters to provide High Availability. If you EVER expect to patch ESX servers without VM downtime then you need at least(†) n+2. When running your clusters to only n+1, you can never safely put one of your hosts in Maintenance Mode; not if High Availability is important […]
The default GUI install of ESX4 makes the /tmp partition 1GB and even then it is only categorized as optional. I’ve been asked several times why you’d want to make /tmp any bigger. If it fills up you just clear it out, right? Well here’s a good reason. It seems that VUM (vCenter Update Manager) […]
Dudley passed me the latest version of the Firewall diagram. Go and grab it: Here’s what’s new since the last download: What’s new in v3: Now synchronized with “VMware Network Ports Compendium v3” What’s new in v213: Change port range in VUM to 9000-9100 (and not 9000-9010) What’s new in v212: Added SRM Port 9007 […]
Here’s a strange one I’ve come across in vCenter 2.5. You have a user, who is a member of an AD group, which has been assigned the Administrator role in vCenter over a Datacenter (or a folder, cluster, host, …) – but not at the root level. Got that? That user can do everything that […]