Storage Technology Corporation

Sierra Applied Sciences, Inc.

Lance J Collins

Barry W Manley

Paul Allen Wewel

Keith H Billings

Ronald Rae Walker

For use in a data storage system, a method of dynamically controlling accesses to and from the storage device array. The method includes monitoring the type and frequency of IO requests to the devices to determine the duty cycle and monitoring at least one parameter related to power usage, receiving or having at least one IO request pending when the data storage system completes the IO and returns to the Idle state, determining when the power usage by the array is greater than the first predetermined level, returning to the idle state when the power usage of the array is greater than the first predetermined level, determining when the duty cycle or the power usage by the array is greater than the second predetermined level when the power usage by the array is equal to or less than the first predetermined level, presenting and alert signal, setting a delay factor when the delay is not set, and determining whether an inter-IO delay has expired when the duty cycle or power usage by the array is greater than the second predetermined level, returning to the idle state when the inter-IO delay has not expired, and performing a respective IO operation in response to the Io request and returning to the idle state when the inter-IO delay has expired, and when the duty cycle or the power usage by the array is equal to or less than the second predetermined level.

System and method of dynamically controlling storage device power supply current

A polarity reversing circuit having energy compensation may comprise a first inductor connected between the first electrode and a negative terminal of a power supply. The positive terminal of the power supply is connected to the second electrode. A diode and a first capacitor are connected in series across the first inductor so that the cathode of the diode is connected to the first electrode. A second capacitor and a switching device are also connected in series across the first and second electrodes. A second inductor is connected between the switching device and the anode of the diode. A bi-directional converter is connected between the power supply and the second capacitor. The voltage polarity between the first and second electrodes may be reversed by actuating the switching device to switch between a non-conducting state and a conducting state. The voltage polarity may be returned to the normal polarity by again actuating the switching device to switch it from the conducting state to the non-conducting state. A bi-directional converter transfers electrical energy between the polarity reversing circuit and the power supply to compensate for variations in the amount of energy reflected by the electrodes during operation.

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Superior, CO, United States of America

Lance J Collins