Computer system for mutual communication through network and its memory management method
First Claim
1. A server for establishing communication upon receipt of access from a client terminal through a network, comprising a memory protection unit for protecting data stored in a volatile memory to be protected, in the event of a power failure, said memory protection unit comprises power monitoring means for detecting a power failure supplied to said above protective memory, and switch controlling means for switching a control and power supply toward said protective memory, wherein when a failure is detected in the power supplied to said protective memory, the control toward said memory is switched to a side of said memory protection unit and said power supply is switched to a standby power before said protective memory has some damaging effect.
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Accused Products
Abstract
In the memory management method, when a failure is detected in the power supplied to a protective memory, a control toward the memory is cut off from a CPU and the power supply is switched to a standby power before the protective memory has some damaging effect; after solution of the power failure, the switching is finished, the control toward the memory is returned to the CPU, and the power supply is returned to an ordinal one; write completion of data is notified to the client at a time when the data sent from the client has been written into the protective memory; whether the last termination is abnormal or normal is checked at the activation; when the last termination is abnormal, the protective memory is returned after memories other than the protective memory are initialized at the activation; and when the last termination is normal, the protective memory is returned and thereafter all the memories are initialized at the activation.
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Citations
29 Claims
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1. A server for establishing communication upon receipt of access from a client terminal through a network, comprising
a memory protection unit for protecting data stored in a volatile memory to be protected, in the event of a power failure, said memory protection unit comprises power monitoring means for detecting a power failure supplied to said above protective memory, and switch controlling means for switching a control and power supply toward said protective memory, wherein when a failure is detected in the power supplied to said protective memory, the control toward said memory is switched to a side of said memory protection unit and said power supply is switched to a standby power before said protective memory has some damaging effect.
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11. A computer system for establishing mutual communication between a client terminal and a server through a network, wherein
said server has a memory protection unit for protecting data stored in a volatile memory to be protected in the event of a power failure, said memory protection unit comprising power monitoring means for detecting a power failure supplied to said above protective memory, and switch controlling means for switching a control and power supply toward said protective memory, in which when a failure is detected in the power supplied to said protective memory, the control toward said memory is switched to a side of said memory protection unit and said power supply is switched to a standby power before said protective memory has some damaging effect.
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17. A memory management method of a server for establishing communication upon receipt of access from a client terminal through a network, comprising the following steps of:
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detecting a power failure supplied to said above protective memory, and switching a control and power supply toward said protective memory, in which when a failure is detected in the power supplied to said protective memory, the control toward said memory is cut off from a CPU and said power supply is switched to a standby power before said protective memory has some damaging effect, so as to protect the data stored in said protective volatile memory, in the event of a power failure.
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26. A memory management program of a server for establishing communication upon receipt of access from a client terminal through a network, comprising the following functions of:
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detecting a power failure supplied to a protective memory, and switching a control and power supply toward said protective memory, in which when a failure is detected in the power supplied to said protective memory, the control toward said memory is cut off from a CPU and said power supply is switched to a standby power before said protective memory has some damaging effect, so as to protect the data stored in said protective volatile memory, in the event of a power failure.
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Specification