Chapter 5: V-Switch Cluster Configuration 73
.
When creating a
cluster, it is
recommended that
the same port on
each V-Switch is
used to connect to
the same FC storage
device. This
increases the chance
of the storage device
receiving the same
default storage
number on both V-
Switches during their
auto-discovery
cycles. This, in turn,
makes cluster
configuration easier.
10267
Cloud
IP SAN
IP1-active
IP2-inactive
IP2-active
IP1-inactive
Tower box
Host 2
iSCSI
initiator
Vol 2Vol 1
Tower box
Host 1
iSCSI
initiator
V Switch 1 V Switch 2
Disk 1 Disk 2
Disk 4Disk 3
IP1,Target 1 IP2,Target 2
iSCSI Target 2
wwui2
iSCSI Target 1
wwui1
Vol 2
LU0
Vol 1
LU0
JBOD
Figure 32. V-Switch Cluster Configuration
When working in a
cluster, the V-Switch
can support a
maximum of 100
portals: 50 active
and 50 inactive.
Clusters also provide high availability in the event of V-Switch failover.
Each network port on the V-Switch is configured with its own active, or
functioning, IP addresses as well as inactive, or dormant, neighbor IP
addresses. If one V-Switch goes off-line, the remaining V-Switch activates
its neighbor’s IP addresses. The hosts continue to access volume targets
through the same IP address without sensing that their ‘regular’ V-Switch
has gone offline or noticing any impact on storage performance.
When working with FC RAID controllers, it is imperative that all LUNs in
the RAID controller are simultaneously exposed through all ports
connected to both V-Switches for the V-Switches to provide high
availability during a V-Switch failover.
