Abstract: There is provided a storage migration method including sending, by a maintenance PC, a power-off instruction for migration to a migration source storage, sending, by the migration source storage, storage configuration information to the maintenance PC, turning off the power of the migration source storage when it is confirmed that the maintenance PC has received the storage configuration information, sending, by the maintenance PC, the storage configuration information and a power-on instruction for migration to a migration destination storage, and outputting, by the maintenance PC, a migration completion notification when a disk drive relocated from the migration source storage can be confirmed to be set in the migration destination storage.

Abstract: Storage apparatus, in response to write command specifying write destination with regards to multiple virtual areas, allocates a free real area of multiple real areas based on storage devices to a write-destination virtual area, of the multiple virtual areas, to which the write destination belongs, and writes write-target data conforming to the write command to the allocated real area. The storage apparatus, where a first write command has been received subsequent to a snapshot acquisition time point, erases an allocation of a first real area to a first virtual area to which the write destination specified in the first write command belongs, allocates the first real area to a free second virtual area to which a real area has not been allocated, allocates a free second real area to the first virtual area, writes write-target data conforming to the first write command to the second real area.

Abstract: Storage apparatus, in response to write command specifying write destination with regards to multiple virtual areas, allocates a free real area of multiple real areas based on storage devices to a write-destination virtual area, of the multiple virtual areas, to which the write destination belongs, and writes write-target data conforming to the write command to the allocated real area. The storage apparatus, where a first write command has been received subsequent to a snapshot acquisition time point, erases an allocation of a first real area to a first virtual area to which the write destination specified in the first write command belongs, allocates the first real area to a free second virtual area to which a real area has not been allocated, allocates a free second real area to the first virtual area, writes write-target data conforming to the first write command to the second real area.