Xcellis WFE and G300 NAS Clusters
The following types of NAS clusters are supported on Xcellis WFE and G300 gateways.
The Load-Balancing feature is supported only on a NAS cluster of Xcellis WFE and G300 gateways, and only for SMB shares.
StorNext NAS load-balancing allows you to group up to 8 Xcellis WFE or G300 nodes together as a NAS cluster. Users connect to the preferred master node within the cluster, which then distributes connections to the other nodes within the cluster.
- Before creating a NAS cluster of Xcellis WFE or G300 gateways, you need to determine which gateways will be part of the NAS cluster. Any Xcellis WFE or G300 gateway running StorNext NAS can be included as a node in the NAS cluster. Note the IP address for each gateway to be included as a node in the NAS cluster.
- IP addresses must be ‘static’ for the Xcellis WFE or G300 gateways. Assigning IP addresses via DCHP may cause unpredictable behavior.
Load-balancing ensures that connections are distributed to nodes within the cluster using a "least number of connections" algorithm. In addition, if one of the nodes in the NAS cluster goes offline, its current connections will be rerouted / reconnected to another node in the NAS cluster.
You can also configure a load-balanced cluster for NAS failover. This configuration ensures that a master node is always available to act as the load-balancer to distribute connections appropriately.
To enable NAS failover within these clusters, a single NAS VIP must be assigned to the cluster. Additional requirements apply to NFS shares within clusters. See NAS Failover.
Xcellis WFE Multi-Node Load-Balancing NAS Cluster with Failover
Scenario A: Load-Balancing without NAS Failover Workflow
- If a non-master node becomes unavailable, the master node redistributes all connections from the failed node to other nodes within the cluster.
Scenario B: Load Balancing with NAS Failover Workflow
- If the active master node becomes unavailable, StorNext NAS automatically fails NAS management services, including load-balancing operations, over to the next available node within the NAS cluster. The next available node can be either the original preferred master node or another node within the NAS cluster.
- When the preferred master node becomes available, failback is not automatic. You must manually issue a release command to return NAS management services to the original master node. See Transfer NAS Services to Another Node.
You can configure an Xcellis WFE or G300 Load-Balancing NAS cluster to export shares from an Xcellis WFD or MDC hosting a StorNext file system.
An Xcellis WFE or G300 Load-Balancing NAS cluster cannot export shares from an Artico system.
For this type of configuration, the following applies:
- The NAS cluster consists of only the Xcellis WFE or G300 nodes.
- The Xcellis WFD or MDC servers host the StorNext file system.
- StorNext NAS is enabled on both nodes of the Xcellis WFD or MDC server.
- The master Xcellis WFE or G300 node communicates with the Xcellis WFD or MDC server to export shares for users.
- NAS failover is not available between the Xcellis WFE/G300 cluster and Xcellis WFD/MDC server.
- Load-balancing is not available between the Xcellis WFE/G300 cluster and Xcellis WFD/MDC server.
G300 Load-Balancing NAS Cluster with Xcellis WFD
NAS Export Workflow
- The active master node of the G300 NAS Cluster exports shares from the StorNext file system located on the Xcellis WFD server.
- The Xcellis WFD server is not available for NAS failover or load-balancing operations.
- You must purchase the StorNext NAS license separately for each Xcellis WFE or G300 gateway, and each Xcellis WFD or MDC server.
- For help with configuring NAS clusters, see NAS Clusters .
For an example scenario in configuring a Xcellis WFE or G300 load-balancing NAS cluster, see NAS Cluster Command Scenarios.