Information Technology Reference
In-Depth Information
vMotion Can Now Leverage Multiple NICs
As of vSphere 5, vMotion can take advantage of multiple NICs to assist with transferring memory
data between hosts.
3.
After the entire contents of RAM for the migrating VM are transferred to the target host
(esxi-04a), then VM1 on the source ESXi host (esxi-03a) is
quiesced
. This means that it is
still in memory but is no longer servicing client requests for data. The memory bitmap
i le is then transferred to the target (esxi-04a). See Figure 12.3.
Figure 12.3
Step 3 in a vMotion
migration involves
quiescing VM1 and
transferring the
memory bitmap
fi le from the source
ESXi host to the des-
tination ESXi host.
esxi-03a.lab.local
esxi-04a.lab.local
VM1
VM1
(inactive)
VM
memory
bitmap
file
vSwitch0
vSwitch2
vSwitch0
vSwitch2
ESXi mgmt
network
VM port
group
ESXi mgmt
network
VM port
group
vSwitch1
vSwitch1
VMkernel
port
VMkernel
port
VM
memory
bitmap
copy
Physical switch
vSphere Web Client
The Memory Bitmap
h e memory bitmap does not include the contents of the memory address that has changed; it
includes only the addresses of that memory—often referred to as the
dirty
memory
.
