Information Technology Reference
In-Depth Information
Example 3
Two hosts on a single vMotion network.
◆
Both hosts use a shared Fibre Channel SAN datastore.
◆
The two hosts in Example 3 are more typical of larger enterprise environments. Generally
in these situations there is a SAN or NAS connecting all ESXi hosts. In this situation, the
data l ows are quite different. As usual, the vMotion network carries the memory data
l ow. The difference in this example involves the shared storage component. Storage vMo-
tion is smart enough to detect when both hosts can see both source and destination data-
stores. It intelligently uses the storage network instead of the vMotion network to migrate
this data even if it's a local datastore at the source! See Figure 12.18.
Figure 12.18
Even if the data-
stores are not the
same, Storage
vMotion is smart
enough to know if
both hosts can see
the destination
datastore. It uses
the storage network
whenever possible.
Shared
Datastore
esxi-03a.lab.local
esxi-04a.lab.local
VM1
VM1
vSwitch0
vSwitch2
vSwitch0
vSwitch2
VM port
group
VM port
group
ESXi mgmt
network
ESXi mgmt
network
vSwitch1
vSwitch1
VMkernel
port
VMkernel
port
Network switch
vSphere administrator initiates a
joint vMotion and Storage vMotion operation
from esxi-03a.lab.local to esxi-04a.lab.local
vSphere Web Client
