Database Reference
In-Depth Information
Figure 6.34
vSphere Storage DRS advanced options.
The default option for Storage DRS will keep all VMDKs from a VM on the same data
store. For a high-performance database, this is not what you would want. You will want
to leverage the available data stores and queue depth to get the best performance while
Storage IO Control sorts out any bumps in the road and ensures quality of service. Our
recommendation for SQL Server environments is to have Keep VMDKs Together
unchecked. This will cause Storage DRS to spread out the VMDKs among the available
data stores. If you have large numbers of SQL Servers, it may be preferable to run them
in a dedicated data store cluster, because this could limit the impact they have on other
workloads, and vice versa.
If at a later stage you want to add data store performance as well as capacity, you can
simply add more data stores to the data store cluster and they will be used for load-
balancing operations per VMDK as well as during initial placement. Separating the
