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PowerScale OneFS 9.8.0.0 Web Administration Guide

SmartConnect Multi-SSIP

OneFS supports defining more than one SmartConnect Service IP (SSIP) per subnet. Support for multiple SmartConnect Service IPs (Multi-SSIP) ensures that client connections continue uninterrupted if an SSIP becomes unavailable.

The additional SSIPs provide fault tolerance and a failover mechanism to ensure continued load balancing of clients according to the selected policy. Though the additional SSIPs are in place for failover, they are active and respond to DNS server requests.

The SmartConnect Basic license allows defining 2 SSIPs per subnet. The SmartConnect Advanced license allows defining up to 6 SSIPs per subnet.

NOTE:SmartConnect Multi-SSIP is not an additional layer of load balancing for client connections: additional SSIPs only provide redundancy and reduce failure points in the client connection sequence. Do not configure the site DNS server to perform load balancing for the SSIPs. Allow OneFS to perform load balancing through the selected SmartConnect policy to ensure effective load balancing.

Configure DNS servers for SSIP failover to ensure that the next SSIP is contacted only if the first SSIP connection times out. If the SSIPs are not configured in a failover sequence, the SSIP load balancing policy resets each time a new SSIP is contacted. The SSIPs function independently: they do not track the current distribution status of the other SSIPs.

Configuring IP addresses as failover-only addresses is not supported on all DNS servers. To support Multi-SSIP as a failover only option, it is recommended that you use a DNS server that supports failover addresses. If a DNS server does not support failover addresses, Multi-SSIP still provides advantages over a single SSIP. However, increasing the number of SSIPs may affect SmartConnect's ability to load balance.

NOTE: If the DNS server does not support failover addresses, test Multi-SSIP in a lab environment that mimics the production environment to confirm the impact on SmartConnect's load balancing for a specific workflow. Only after confirming workflow impacts in a lab environment should you update a production cluster.

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