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• Configuring a virtual IP address that will be hosted by the current ‘master’ gateway for high
availability of gateway management operations and ease of use by not needing to know
which gateway is currently the acting master of the gateway pair
• Creating a tagged VLAN on the same bonded gateway Ethernet ports to allow for inter-
gateway communication, while isolating multi-cast traffic between the paired gateways
For a reliable network, it is recommended to use a minimum of two Ethernet switches with multiple
trunk links between them for higher availability. The Ethernet switches must minimally support Link
Aggregation Control Protocol (LACP) IEEE 802.1ax, Virtual LANs (VLANs) IEEE 802.1Q and must
support VLAN traffic (802.1Q) flow between switches. Additional intervening switches may be
physically between the two Ethernet switches and thus all switches will need to allow VLAN traffic to
flow (via distributed trunking, split trunking, or similar feature) between the two edge Ethernet
switches being used.
A single Ethernet switch can be used, but with the understanding that the single Ethernet switch will
be a single point of failure for gateway and LUN management operations.
For planning of the reliable network configuration, you will need to identify:
• Two IP addresses which will be assigned one to each of the two gateways being paired
• An additional IP address on the same sub-net which will be used as the Virtual IP (VIP) and
always active on the current ‘master’ gateway of the pair
• Port bonding or link aggregation mode that will be used when bonding the two Ethernet
ports on each of the two gateways. In this pairing process, ‘balance-rr’ mode is used since
for many switches explicit switch port trunking is not required. If other link aggregation
modes are used, trunking of the Ethernet switch ports connecting to the bonded gateway
ports will be required. When two Ethernet switches are being used as recommended,
switches will also need to support split trunking or distributed trunking.
• A VLAN ID which will be configured to include the same switch ports which are connected
to the VMA SAN Gateways bonded Ethernet ports. The VLAN will need to be configured on
the ports as a tagged VLAN so that both user gateway management requests and inter-
gateway communication can flow over the same physical links.
Possible Gateway Pairing Scenarios
There are three possible scenarios for establishing a redundant pair of VMA SAN Gateways:
• Starting with two new (or previously fully de-configured) gateways and forming a redundant
gateway pair
• Adding a new (or previously fully de-configured) gateway to an existing (configured)
standalone gateway configuration to form a redundant gateway pair
• Have two existing stand-alone gateways, each with only one connected array, and wish to
use these two gateways to form a redundant pair with two dually connected arrays. Note
that in this case one of the existing gateway configurations will be used as the ‘primary’
gateway and the other gateway and array will be re-initialized to add in as though new.
Determine which above scenario matches your situation. As part of the Preparation step, you will be
guided in detail what to do for each scenario.
(178 pages)
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