Google has revealed the issue behind the Unisuper cause célėbre earlier in May, that led to the Australian superannuation fund's cloud presence being deleted without warning, leading to a long service outage.
In a post-mortem of the incident, an unnamed blog author blamed the deletion on an internal tool used in 2023 to set up Unisuper's Google Cloud VMware Engine Private Cloud (GCVE).
While Google says its operators followed internal control protocols, a single parameter for the internal tool was left blank when the private cloud was provisioned. This was interpreted by the system as Unisuper's cloud being set to expire after one year.
"Once the expiry date was reached, that was it: Unisuper's cloud was set to be automatically deleted. Furthermore, there was no warning to the customer because of the internal Google tool being used for the deployment of the Private Cloud."
Making matters worse, while Unisuper said it had duplicated the cloud instance across two geographies as protection against outages and loss, the expiring subscription meant this too was deleted. An instance in this context is IT industry jargon for an occurrence of a virtual computer system running in one or more cloud data centres.
Unisuper had migrated to Google Cloud from Microsoft Azure and two of its own data centres last year.
The accidental deletion of Unisuper's cloud instance made the news all over the world, and Google Cloud chief executive Thomas Kurian had to front up for the misconfiguration and apologise.
Recovery from the cloud instance deletion was difficult, and took days with 24-7 effort from engineers required. Thanks to diligent backups by Unisuper, and a robust and resilient architecture designed by the company, data loss was minimal.
To avoid a repeat of the disastrous incident Google said it deprecated the internal tool that caused "this sequence of events", and fully automated capacity management with no need for human intervention.
Google Cloud was at pains to say the auto-deletion of Unisuper's cloud is not a systemic issue and that no other GCVE deployments are at risk. The system behaviour that set Unisuper's cloud to be automatically deleted has also been corrected, Google Cloud said.
We welcome your comments below. If you are not already registered, please register to comment
Remember we welcome robust, respectful and insightful debate. We don't welcome abusive or defamatory comments and will de-register those repeatedly making such comments. Our current comment policy is here.