A resilient system is one which is designed to recover from any failures or disruptions to the ‘cloud architecture’ (the software system’s physical storage design).
Why would you want a resilient SRE?
Even if your system is on the cloud, it doesn’t necessarily mean accessible backups of your product will be easy to find and use.
Resilience means that the software has the ability to continue on in the event of a failure, which provides assurance for stakeholders, and product designers, that their product won’t go completely offline in case of an emergency. This is why designing for downtime is crucial, particularly when considering customer usage and satisfaction.
How does a resilient SRE work?
An SRE is an automated management solution or response that is designed into the cloud architecture in preparation for a disaster event. A resilient SRE architecture is built to redirect customers in the event of an emergency, using the resilience and recoverability of the SRE architecture to avoid any downtime event. It does this by fighting on two fronts, one tackling the problem via its security systems, the other rebooting and confirming customers through the SRE backup.
The value of resilience in SREs
A resilient SRE should offer:
- A definition of the recoverability requirements based on the business objectives, expectations and any regulatory requirements related to your business.
- An evaluation of the cloud service providers' performance, availability, scalability and capability, and the cloud’s technical architecture.
- Resilience within the system design. The design should be one that can be scaled for business growth (without losing performance), has multiple ‘availability zones’ for storing items, has a load balancer (to deal with client requests across multiple servers and networks), has multiple failover systems (meaning it can switch network, computer or hardware component if any system fails), and has data backups available.
- Load performance and stress testing for heavy user events.
- The capability for improvement worked into the cloud’s architecture based on any findings or feedback given from the customers.
Main advantages of resilience in SRE
- Forecasted workflow
- Improved relations with the development team
- The potential to scale
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