STORAGE SYSTEM AND CONTROL APPARATUS

摘要

A first control apparatus includes a first memory unit including a local cache, a first power supply that supplies electric power to the first memory unit, and a control unit. The control unit controls a write into a memory device by a write-back method, using the local cache. The control unit mirrors data of the local cache in a mirror cache of a second control apparatus. The control unit determines whether the mirror cache is included in a second memory unit that receives electric power from a second power supply of the second control apparatus, upon detecting an abnormal state of a battery for supplying electric power to the second memory unit in case of power outage of the second power supply. The second memory unit switches write control for the memory device to a write-through method, when the second memory unit includes the mirror cache.

主权项

1. A storage system comprising:
a first memory device; a second memory device; a first control apparatus including: a first memory having a first cache region and a mirror cache region, a first power supply configured to supply electric power to the first memory, a battery configured to supply electric power to the first memory at a time of power outage of the first power supply, and a first processor configured to control a write into the first memory device by a write-back method by using the first cache region, and switch write control for the first memory device to a write-through method upon detecting an abnormal state of the battery; and a second control apparatus including: a second memory having a second cache region, a second power supply configured to supply electric power to the second memory, the second power supply being different from the first power supply, and a second processor configured to control a write into the second memory device by the write-back method by using the second cache region, and mirror data of the second cache region in the mirror cache region, and switch write control for the second memory device to the write-through method upon detecting an abnormal state of the battery.