Server & Storage Power Supplies
Whereas a conventional design has numerous cables permanently connected to the power supply, a modular power supply provides connectors at the power supplyend, allowing unused cables to be detached from the power supply, producing less clutter, a neater appearance and less interference with airflow.
The use cases for redundant power supplies in servers generally involve:
1. Business applications where downtime impacts either user or customer access to information and applications.
2. Co-located servers where a technician may be hours or a day away from servicing an equipment failure. Usually this scenario involves some sort of business application described in 1.
3. Mission-critical applications where nodes cannot fail. For example, scientific application infrastructures that are not fault tolerant need to have the ability to be serviced mid-run.
Unlike disk failure, power failure causes an entire system to be knocked completely offline. That is why modern datacenters spend so much time and money with building redundant power supplies, investing in power feeds from different grids, backup generators, and large uninterruptible power supply (UPS) units. Redundant power supplies are built to work into the redundant power systems in datacenters and ensure that power gets delivered to all functional server components.