Non-Recommended Networking
This section describes some non-recommended networking topologies for the active-active DC solution.
If your network does not use the standard or any of the following network topologies, contact Huawei technical support to help you assess risks.
Quorum Server Deployed in Either Active-Active DC
In the following example, the quorum server is deployed in DC 1.
- Scenario
The quorum server is deployed in DC 1 or DC 2. No UPS is configured for the quorum server and quorum network devices.
- Risk
Services will be interrupted if the DC where the quorum server is deployed goes down due to a power failure or disaster.
No Quorum Server
The following uses cross-DC deployment as an example. DC 1 is the preferred site and DC 2 is the non-preferred site. Figure 3-6 shows a network on which no quorum server is deployed.
This example is also applicable to single-DC deployment.
- Scenario
No quorum server is deployed and the storage systems use static priorities.
- Risk
Services will be interrupted if the preferred site fails.
Both Storage Systems Deployed in the Same Equipment Room
Figure 3-7 shows a network on which both storage systems are deployed in the same equipment room.
- Scenario
Both storage systems are deployed in the same equipment room.
- Risk
Services will be interrupted if the equipment room goes down due to a power failure or disaster.
Port Sharing
The following uses cross-DC deployment as an example. Figure 3-8 illustrates the networking mode.
This example is also applicable to single-DC deployment.
- Scenario
The host-to-storage service network, HyperMetro replication network between the DCs, and quorum network share ports on the storage systems.
- Risk
- The service and replication networks must be physically isolated and must not share ports.
- If the service and quorum networks share a port, the quorum link will be down if this port fails.
- If the replication and quorum networks share a port, both the replication and quorum links will be down if this port fails. Services may be interrupted.