A fault domain chosen by the customer, such as a different building or a separate section of the same data centre, linked to its partner with less than 10 ms round-trip latency, plenty of bandwidth, independent network routes and stretched Layer 2 so management appliances can move. A stretched cluster covers two zones, whereas recovering between regions counts as disaster recovery.
Also called AZ.
Read more: Broadcom TechDocs
In the Ultra Transcenders books
Each book explains Availability zone in context, with comparison tables and the common traps.
Terms in this definition
- Fault domain
VMs that share a network switch and power source. To contain rack-level failures, an availability set distributes its VMs across as many as three of these (two in certain regions).
- L2
Layer 2 of the OSI model, the data link layer of frames, VLANs and MACs. An NSX segment is one broadcast domain at this layer.
- DR
Disaster recovery means getting a service running again from another region or site, with success judged by RPO and RTO; uptime SLAs and data retention are different concerns.