Upgrading and Repairing Servers
Common Server/UPS ConfigurationsWith so many UPS units with different capacities on the market, there are an almost unlimited number of server and UPS configurations possible. However, they can be broken down into a few categories. The following sections show the details of the following typical configurations:
Note The calculations in the following sections are based on the APC UPS Selector, located at www.apc.com/tools/ups_selector/. Other vendors offer similar online configuration tools. Pedestal Server and UPS
Typically, you use a tower or mini-tower UPS with a pedestal server (such units are also suitable for use with a tower server). Table 14.4 lists some typical pedestal server configurations and the VA ratings needed to sustain a runtime of 30 minutes or longer with at least a 30% margin for future expansion. Items in Table 14.4 are listed in order of wattage and recommended VA ratings.
[1] With additional battery. If the server has RPSs, you should connect each power supply AC cable to a separate port on the UPS unit. Single Rack-Mounted Server and UPS
Typically, if you use a rack-mounted server, you also want to use the rack-mounted server for other components, including your UPS. Table 14.5 lists some typical rack-mounted server configurations and the VA ratings needed to sustain a runtime of 30 minutes or longer with at least a 30% margin for future expansion. Items in Table 14.5 are listed in order of wattage and recommended VA ratings.
If the server has redundant power supplies, connect each power supply AC cable to a separate port on the UPS unit. Multiple Rack-Mounted Servers and UPS
One of the attractions of the rack-mounted server form factor is the ability to place multiple servers into the same rack. This saves a great deal of floor space compared with what pedestal servers with comparable features would require. In such situations, it makes sense to use a single higher-capacity UPS to provide backup power to all the servers in a rack. Table 14.6 lists the recommended VA ratings for the same rack-mounted servers shown in Table 14.5, in quantities of two, three, and four units.
[1] With additional battery. [2] With two additional batteries. Each server should be connected to a separate load bank on the UPS. If a server has RPS units, you should connect each RPS to the same load bank if only one UPS is used. If additional UPS units are used, you can connect each RPS to a separate load bank. Using and Maintaining UPS Documentation
The more complex a UPS unit is, the more important it is to keep documentation available for ready reference. A high-capacity line-interactive or any double-conversion online UPS unit might have several components, each with its own documentation:
If you do not want to keep the original documentation with the UPS unit, you can usually download PDF versions from the vendor's website. These can be printed out for reference and stored in a binder next to the UPS unit. In addition to keeping the manufacturer's documentation available for use, you should also record changes you have made to the default settings of the UPS unit or its accessories, such as the following:
If you print a copy of the original documentation, you can use a highlighter to indicate the selected options and write down the date the option was selected. Note If you have only one UPS that you manage through the network, you could keep the default name. If you have more than one, you should develop a name strategy and use the next available name for each new UPS you add to the network. For example, if the first UPS unit is named "BattBkup" by default, you should consider changing the name to "BattBkup01" and numbering other units sequentially, starting with "BattBkup02." Alternatively, you could assign names that indicate the location, such as "UPS_ServerRM01" or the server being protected, such as "UPS_CommSvr." See the documentation for your UPS unit for details.
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