Power-saving-backup management method

A storage system, comprising:

• a first storage subsystem including a controller, and a first logical storage area in a RAID group configured by a plurality of storage devices;
• and
• a second storage subsystem including a second logical storage area in a plurality of the RAID groups each configured by the plurality of storage devices, wherein
• the first storage subsystem couples with the second storage subsystem over a network, the first and second logical storage areas form a copy group, and the controller stores a copy of data stored in the first logical storage area into the second storage area thorough the network, and
• when starting copying from the first logical storage area to the second logical storage area, the controller performs a mode change, from a power saving mode to a ready mode, to the plurality of storage devices configuring the plurality of RAID groups corresponding to the second logical storage area, wherein when starting copying of the data from the first logical storage area to the second logical storage area, the controller makes, remain in the power saving mode, the plurality of storage devices configuring the RAID groups corresponding to any part of the second logical storage area being not a target for the copying of the data, wherein when starting copying of the data from the first logical storage area to the second logical storage area, the controller makes the mode change, from the power saving mode to the ready mode, starting from the storage devices configuring the RAID groups corresponding to any part of the second logical storage area being the target for the copying at the earliest timing.

A method for controlling a storage subsystem including a first logical storage area in a RAID group configured by a plurality of storage devices, and a second logical storage area in a plurality of the RAID groups each configured by the plurality of storage devices and storing a copy of data stored in the first logical storage area, the method comprising the steps of:

• forming a copy group by the first logical storage areas and second logical storage areas;
• and
• performing, when starting copying from the first logical storage area to second logical storage area, a mode change, from a power saving mode to a ready mode, to the plurality of storage devices configuring the plurality of RAID groups corresponding to the second logical storage area, wherein when starting the copying from the first logical storage area to the second logical storage area, the plurality of storage devices configuring the RAID groups corresponding to any part of the second logical storage area being not a target for the copying of the data from the first logical storage area are remained in the power saving mode, wherein
• when starting the copying from the first logical storage
• area to the second logical storage area, the mode change is performed from the power saving mode to the ready mode starting from the storage devices configuring the RAID groups corresponding to any part of the second logical storage area being the target for the copying at the earliest timing.

A control method for controlling a storage system including a first storage subsystem provided with a controller and a first logical storage area in a RAID group configured by a plurality of storage devices, and a second storage subsystem provided with a second logical storage area in a plurality of the RAID groups each configured by the plurality of storage devices, and in the storage system, the first storage subsystem is connected to the second storage subsystem over a network, the method comprising the steps of:

• forming a copy group by the first and second logical storage areas;
• storing a copy of data stored in the first logical storage area into the second storage area over the network;
• and
• performing, when starting copying from the first to second logical storage area, a mode change, from a power saving mode to a ready mode, to the plurality of storage devices configuring the plurality of RAID groups corresponding to the second logical storage area, wherein when starting the copying from the first logical storage area to the second logical storage area, the plurality of storage devices configuring the RAID groups corresponding to any part of the second logical storage area being not a target for the copying of the data from the first logical storage area are remained in the power saving mode, wherein
• when starting the copying from the first logical storage
• area to the second logical storage area, the mode change is performed from the power saving mode to the ready mode starting from the storage devices configuring the RAID groups corresponding to any part of the second logical storage area being the target for the copying at the earliest timing.