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Use shut-off valves in front of the hoses. This configuration allows for the removal of the hoses for a service procedure or relocation. Valves are not included in the order. A stainless steel fitting is available for ordering. The fitting is barbed on one side and has a 2.54 cm (1 in.) male national pipe thread (NPT). For more information about the tools that are needed for the water supply connections, see the IBM 3906 Installation Manual for Physical Planning, GC28-6965. 

## 10.1.4 Internal Battery Feature 

In case of power shutdown, the optional Internal Battery Feature (IBF) provides sustained system operations for a relatively short time, which allows a proper z14 server’s shutdown. In addition, an external uninterrupted power supply system can be connected, which allows for longer periods of sustained operation. 

The IBF can provide emergency power for the estimated time that is listed in Table 10-5. The number of IFBs depends on the number of BPRs. For the number of BPRs that are installed in relation to I/O units and the number of CPC drawers, see Table 10-5. They are installed in pairs. You can have two, four, or six batteries (odd numbers are not allowed). 

<img src='content_image/1003470.jpg'>

a. I/O units = the number of I/O drawers or PCIe I/O drawers. 

Consideration:  The system holdup times that are listed in Table 10-5 assume that both sides are functional and have fresh batteries under normal room ambient conditions. 

Holdup times are greater for configurations that do not have every I/O slot plugged, the maximum installed memory, and are not using the maximum processors. 

These holdup times are estimates. Your particular battery holdup time for any specific circumstance might be different. 

Holdup times vary depending on the number of BPRs that are installed. As the number of BPRs increases, the holdup time also increases until the maximum number of BPRs is reached. After six BPRs (three per side) are installed, no other batteries are added; therefore, the time decreases from that point. 

Holdup times for actual configurations are provided in the power estimation tool at IBM Resource Link website. 

On the Resource Link page, click Tools → Machine information , select your IBM Z system, and click Power Estimation Tool . 

