User Manual - A3661-90001
![](/manual/hp/hp-high-availability-disk-array-10-20/user-manual-a3661-90001/images/img-307.png)
Power Supply Unit Removal and Replacement 7-11
Removal and
Replacement
Power Supply Unit Removal and Replacement
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Note The disk array will not operate with only one power supply unit. To allow hot-
replacement, three power supply units must be installed.
A power supply unit must be removed and replaced, and the fan pack closed again,
within two minutes or the disk array will do a thermal shutdown.