Computer system and volume migration control method using the same

A method of controlling a volume migration control for a computer system comprising the steps of:

• accessing a memory resource by a host computer;
• providing to the host computer a volume of a storage system whereby a logical memory resource is created, the storage system including:
• a first storage system that has a first parity group and sets a first volume to the first parity group;
• and a second storage system that has a second parity group and sets a second volume to the second parity group;
• and
• managing migration of the volume of a management device;
• wherein the second volume is the migration destination object;
• wherein the management device controls the first storage system and the second storage system in order to execute the volume migration processing between the first and the second volume;
• the method including the steps of:
• comparing by the management device, when detecting a task of migration of the volume based on a request from a first administrator, an encryption function setting status of the volume with the encryption function setting status of a migration destination object of the volume;
• and sending notice of this comparison result to a second administrator, who is different from the first administrator, for security management of the storage system;
• sending by the management device, if the management device compares an encryption level of the second volume with the encryption level of the first volume and determines that the former encryption level is lower than the latter encryption level, notice of this result as a first judgment result to the second administrator;
• sending by the management device, if the management device compares an encryption key backup type of the second volume with the encryption key backup type of the first volume and determines that the former encryption key backup type is inferior to the latter encryption key backup type, notice of this result as a second judgment result to the second administrator;
• and determines whether or not it is necessary to continue the volume migration request from the first administrator, based on a request from the second administrator who has received the notice;
• notifying by the management device, if it is determined that the first volume is encrypted and the second volume is not encrypted, the second administrator of the first judgment result;
• wherein, if both the first volume and the second volume are encrypted and the encryption key backup type of the first volume is the same as the encryption key backup type of the second volume, the management device has the first storage system and the second storage system execute processing for migrating the volume from the first volume as a migration source to the second volume as a migration destination without requiring the second judgment result;
• and if the encryption key backup type of the first volume is different from the encryption key backup type of the second volume, the management device notifies the second administrator of the second judgment result.