Is a kind of installed in the mainframe computer tattoo power supply closed independent components, its role is to alternating current (ac) through a switch tattoo power transformer in for 5 V, 5 V, + 12 V, 12 V, such as stable dc + 3.3 V, to supply the mainframe system version, floppy disk, hard disk drives and various adapters use expansion card and other system components. In layman's terms, one power source is broken, and another backup copy power supply. Hardware availability can be enhanced by providing battery backup for nodes and disks. HP's support for uninterruptible body power (UPS), such as HP PowerTrust, is wary of instant power loss. The connection mode of the disk and the power supply circuit should connect the mirror copy respectively to the different body power supply. The root disk and its corresponding node should be powered by the same power supply circuit. In particular, the cluster lock disk (used as an arbitrator when reorganizing the cluster) should have redundant body power, or it can be powered by a body power source outside the cluster node. Your HP representative can provide detailed information on the body power, disk, and LAN hardware layout of the cluster. At present a lot of disk array and other frame system containing multiple tattoo power input, they should be deployed as a different tattoo power input devices connected to the with two or three independent tattoo power input circuit device, so that, in general, no more than one, as long as the failure of circuit system can continue to work normally. Therefore, if all the hardware in the cluster has two or three body power inputs, then at least three separate circuits are required to ensure that there is no single point of failure in the cluster circuit design.