Patent application number | Description | Published |
20100229018 | THREE STAGE POWER UP IN COMPUTER STORAGE SYSTEM - Embodiments for operation of a storage system following a power loss are provided. The system switches to the local power supply, prevents the receipt of input/output commands and copies the content of cache memory to a local storage device. On detecting resumption of external power, the system charges a local power supply, copies the content of the local storage device to the cache memory and processes the content of the cache memory with respect to at least one storage volume. When the charge stored on the local power supply exceeds the charge required to copy the content of the cache memory to the local storage device by a predetermined amount, the system allows the receipt of input/output commands using a reduced portion of the cache memory. Once the charge stored on the local power supply has reached a predetermined level, the system allows the receipt of input/output commands using all cache memory. | 09-09-2010 |
20120215981 | RECYCLING OF CACHE CONTENT - A method of operating a storage system comprises detecting a cut in an external power supply, switching to a local power supply, preventing receipt of input/output commands, copying content of cache memory to a local storage device and marking the content of the cache memory that has been copied to the local storage device. When a resumption of the external power supply is detected, the method continues by charging the local power supply, copying the content of the local storage device to the cache memory, processing the content of the cache memory with respect to at least one storage volume and receiving input/output commands. When detecting a second cut in the external power supply, the system switches to the local power supply, prevents receipt of input/output commands, and copies to the local storage device only the content of the cache memory that is not marked as present. | 08-23-2012 |
20120221879 | THREE STAGE POWER UP IN COMPUTER STORAGE SYSTEM - Following a loss of power, a storage system switches to a local power supply. The system switches to the local power supply, prevents the receipt of input/output commands and copies the content of cache memory to a local storage device. On detecting resumption of external power, the system charges a local power supply, copies the content of the local storage device to the cache memory and processes the content of the cache memory with respect to at least one storage volume. When the charge stored on the local power supply exceeds the charge required to copy the content of the cache memory to the local storage device by a predetermined amount, the system allows the receipt of input/output commands using a reduced portion of the cache memory. Once the charge stored on the local power supply has reached a predetermined level, the system allows the receipt of input/output commands using all cache memory. | 08-30-2012 |