What is disk duplexing?

Disk duplexing is specifically a form of disk mirroring that enhances data redundancy and reliability in a data center environment. In this approach, two disk drives are utilized to store identical copies of data simultaneously. Each disk operates independently, which not only provides the benefit of data backup but also ensures that if one disk fails, the other can immediately take over without any data loss or interruption in service.

This redundancy is critical in maintaining high availability within data centers, where the risk of downtime can have significant operational and financial implications. Unlike simple mirroring, where two disks might be managed by a single controller, disk duplexing involves separate controllers for each disk. This separation further strengthens the fault tolerance because it mitigates risks associated with failure at the controller level.

Overall, disk duplexing plays a vital role in disaster recovery strategies and helps ensure that critical data remains accessible, making it an essential concept within data center operations.