One of the problems with using tiered storage used to be that when a VM with disks on different datastores was Storage vMotioned, the disks would end up on a single datastore.
The simple solution to this is to use the ‘Advanced’ option when using Storage vMotion. It allows you to granularly control where each of the VMs hard disks and configuration files go.
Take a look at these screenshots:
When you get to the select datastore part of the migration wizard, click on the “Advanced” button:
This will bring you to a screen that looks like the one below. On this window, you can click on “Current Location” to get a drop down menu with a list of available datastores and decide where the individual files go.
This feature simplifies sVMotions especially when you have a setup that has tiered storage and you want to preserve the storage tiering when moving between datastores.
Drop me a line if this has helped you.