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SvSAN Witness

Lightweight, resilient quorum for hundreds of sites at once

Eliminate the risk of split-brain while benefiting from true two node high availability

StorMagic SvSAN’s witness service is the lightweight, incredibly resilient feature that enables genuine highly available between two server nodes. Included in both SvSAN Standard and Advanced Editions, the witness ensures that hardware failure and the threat of downtime can be significantly reduced, while split-brain can be eliminated completely.

Simple

Capable of providing a witness service to hundreds of clusters at once from a single location, eliminating the threat of split-brain scenarios.

Cost-Effective

Prevents the need to deploy three nodes at every location plus low system requirements ensure significant savings.

Resilient

Can be located locally to a cluster, or remotely over a WAN link, with tolerated latencies as high as 3000ms and bandwidth as low as 9Kb/s.

White Paper: Explaining the StorMagic SvSAN Witness

Read a more detailed examination of the SvSAN witness with this white paper which includes requirements, tolerances, testing performance and failure scenarios. Complete the form and continue your learning.

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By clicking download, you consent to allow StorMagic to store and process the personal information submitted and for StorMagic to contact you via telephone and email in relation to the content requested. StorMagic is committed to protecting and respecting your privacy, and we’ll only use your personal information to provide the products and services you requested from us. You may unsubscribe from StorMagic marketing communications at any time. For more information on how to unsubscribe, our privacy practices, and how we are committed to protecting and respecting your privacy, please review our Data Protection Policy.

Without a witness, an even-numbered cluster is at risk of split-brain. If a node loses contact with the cluster it becomes isolated, operating independently, and its data becomes inconsistent with the rest of the cluster. When this node is eventually reintroduced to the cluster, these inconsistencies may result in data corruption and potentially even data loss.

Heartbeat Optimum State

The SvSAN witness prevents split-brain scenarios from occurring. It can be sited locally to a cluster, or at a remote location over a WAN link. A single SvSAN witness can provide a quorum service to hundreds of SvSAN clusters. Additionally, it can tolerate significant latency and low bandwidth, allowing it to be located great distances from the clusters it provides quorum service for, even if they are in remote, harsh environments. These attributes make the witness an ideal fit for organizations with many locations where local highly available storage is a requirement at each, such as a nationwide retail chain that uses just 4 witnesses across more than 2000 stores.

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Think SvSAN might be a good fit for your project? Get in touch to discuss your requirements today.

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“During system testing and automatic reboots, SvSAN recovers and starts synchronizing immediately, and in just 20 minutes, everything is fully fault tolerant again with no manual intervention. We’ve experienced 100% system uptime for six years and counting.”

Bart de Goeij | Asset Management/Maintenance & Operations | Amsterdam Airport Schiphol

"As of today we've had zero issues, no split brain scenarios and I'm confident that I can go on holiday without downtime!"

Ryan Anderson | Manager of IT | CDS Group of Companies