VCD

The number of datastores affects manageability, and therefore the fewer datastores involved the better. In terms of fast provisioning, IOPs are a better metric to watch and using caching for the type of use (read caches for VMs that do a lot of lookup, write caches for VMs that write a lot) are larger benefits.

Factors to consider that affect performance include:
- total number of VMs on volume
- IOPS capability of volume (underlying disk aggregate)
- fast provisioning enabled
- thin provisioning enabled
- rate of power operations on VMs
- rate of cloning operations, Read more »

Out of the box, vCloud Director has two URLs—one for HTTP traffic and one for the console proxy. If you want to configure multiple URLs for the HTTP traffic, you will need to set up a load balancer in front of the vCD cells and forward the URLs to the vCD cells appropriately.

The cells will NOT examine the hostname/FQDN for the requests and will not be able to distinguish a difference between myhpc and mycloud requests. As far as they are concerned, if they receive the request they will attempt to satisfy it if the resource exists.

VMware vCloud Director does not care what you specify within the certificates. Instead, vCloud Director only cares that there are the proper number in the user-supplied keystore, that the type of the keystore is JCEKS, and that there is an unbroken trust chain for the certificates. Read more »

When using Fast-Provisioning on vCloud Director you might get the vCenter error:

A general system error occured: Could not open/create change tracking file

We identified this to be an issue when vCloud Director creates it's hidden snapshot on the master. The following workaround (not validated by VMware support) helped in our case:

There is an undocumented and fully unsupported way to change the MAC-Address of a virtual machine in a vCloud Director environment.

Please validate first that the vApp in vCloud Director is fully powered off before proceeding.

Use the following SQL query to identify the MAC Address of the virtual machine:

SELECT mac_address FROM dbo.network_interface WHERE vm_id IN (SELECT id FROM dbo.vm WHERE name LIKE 'THE VM I SEARCH FOR');

Please ensure that you have a unique hit, otherwise you might need to add additional search parameters.

With an update statement like: Read more »