Centralised or Distributed?
CENTRALISED OR DISTRIBUTED PROTECTION?
Compared to single-user systems, networked computers are more susceptible to data loss in the event of power supply failures.
This sensitivity is due to the fact that, in most network operating systems, the mapping of disks remains in volatile memory (RAM) and is updated on the hard disk occasionally. During a power failure, this volatile memory is irretrievably lost and work must be resumed from the most recent back-up.
The hard disk of these systems is also much more sensitive to stress, and sudden system crashes can irreparably damage it.
The use of the appropriate UPS is therefore more essential than ever.
UPSs can be integrated into your computer system in two different ways. Choose the most functional system in relation to your system situation.
CENTRALISED PROTECTION
One UPS to protect all critical loads.
If there is already a ring power supply network dedicated to the IT system, it may be more convenient to install a single UPS to which all systems are connected.
With this solution, the UPS provides the entire network with centralised protection.
| Advantages | Disadvantages |
| A single UPS installed and to be managed. Certainly simpler and cheaper than many small UPSs. | A single UPS constitutes what is known as a ‘Single Point Failure’ This can be remedied by redundant UPS installations, which entail a considerable increase in costs. |
| One UPS to maintain. Certainly simpler and cheaper than many small UPSs. | The UPS is generally far away from the load to be protected, so it is necessary to set up a suitable electrical system. |
| Increased energy efficiency that translates into lower electricity consumption. | Installation, cabling and self-expansion costs can be high. |
| Normally the UPS is placed in a protected and secure technical room with optimal environmental conditions. | Specialist technical personnel are generally required for installation and maintenance. |
DISTRIBUTED PROTECTION
Multiple UPSs to protect different critical loads.
In the absence of a power supply ring network or if your systems are located on different floors within the same building, it may be more appropriate and convenient to connect a UPS of adequate power to each node or workstation.
In this case we speak of distributed protection.
| Advantages | Disadvantages |
| The power supply sockets already present in the system can be used. | Complex management and monitoring. Many UPSs located at different points. |
| Sizing dedicated to the individual loads to be protected. | Lengthy and complex maintenance; e.g. checking and changing batteries to be carried out on many UPSs at different times. |
| Small independent UPSs close to the loads to be protected. | Emergency shutdown to be managed on a machine-by-machine basis. |
| Existing UPSs can be maintained, integrated and used together with the new ones. | Higher electricity consumption. |
