Database Reference
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from one data store to another data store while the virtual machine is powered with no
disruption in service. For the SQL Server virtual machines running on vSphere, this
provides many benefits. The first is if the data store the virtual machine is running on is
running out of room and action cannot be taken to grow the current data store, the SQL
Server's virtual disks can be relocated onto a data store that has sufficient room.
Another use case is when the SQL Server virtual machine's I/O requirements exceed the
capabilities of the data store on which it resides, the virtual machine's disk files can be
relocated onto a data store that will satisfy the performance requirements.
Note
Storage vMotion operations are greatly enhanced when using VAAI-
compliant subsystems. For more information on VAAI, refer to Chapter 6 .
Storage DRS
Much like how DRS pools together CPU and memory resources, Storage DRS pools
together storage resources. Storage DRS provides a means by which the management of
a group of data stores is automated based on variables such as latency and utilization.
As virtual machines are placed into a Storage DRS-enabled cluster, Storage DRS will
monitor the individual data stores and make appropriate migration decisions based on
how Storage DRS is configured. The benefit for a virtualized SQL Server is that
policies can be put in place to manage the SQL Server virtual machines to protect
against a poor-performing data store as well as a data store that is running out of
capacity.
Enhanced vMotion X-vMotion
X-vMotion is the combination of vMotion and Storage vMotion within a single
operation. This means that a virtual machine is able to change the ESXi host it is running
on and the data store (storage) the virtual machine is running on at the same time, even if
the storage is not shared between hosts.
Note
For more information on X-vMotion, see
http://blogs.vmware.com/vsphere/2012/09/vmotion-without-shared-
storage-requirement-does-it-have-a-name.html .
vSphere HA
vSphere HA provides protection when running multiple virtual machines on the same
host. vSphere HA is designed to monitor the physical ESXi hosts for availability. If an
 
 
 
 
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