Preparing for installation 31
Electrical requirements
Power requirements are one of the most important considerations prior to
installing your disk array. For disk array cabinets with two connections to
AC power, if one input fails, the second input must be capable of
supporting the entire current demand nominally shared by the two power
connections. For disk array cabinets with four connections to AC power,
the two power connections to AC Box 1 or the two power connections to
AC Box 2 must be capable of supporting the entire current demand
nominally shared by the four power connections. The figure below shows
two examples of the fault-tolerant operation of the disk array.
Line voltage
The line voltage (AC) at the wall power outlet is a function of the local
power utility and your building power distribution network. Voltages
outside the operating range of the disk array can cause intermittent system
errors or a complete system shutdown. If required, the HP CE, along with
Disk Array Cabinet
(2 AC Power
connections)
(4 AC Power
connections)
Disk Array Cabinet
The Disk Array can tolerate the loss
of connection to AC Box 1 or AC Box 2.
AC Power
Input Box
#2
AC Power
Input Box
#1
AC Power
Input Box
#2
AC Power
Input Box
#1
The Disk Array can tolerate the loss
of connections to AC Box 1 or AC Box 2,
but no other combinations are allowed.
