Computer system and storage managing method

A computer system comprising:

• a primary site storage system in which a primary site providing a plurality of primary volumes to a host is configured;
• a secondary site storage system which is connected to the primary site storage system via a network and in which a secondary site providing a plurality of secondary volumes in which remote copies of the plurality of primary volumes are set is configured;
• and
• a management device managing the primary site storage system and the secondary site storage system,
• wherein the management device is configured to change a resource of the secondary site storage system,
• wherein, in a case where a failure occurs in the primary site, the management device performs a failover of making a corresponding secondary volume take over operation of the primary volumes, controls so as to enhance a resource of the secondary site storage system, and controls the failover so that a secondary volume which starts operating by the failover before the enhancement of the resource and a secondary volume which starts operating by the failover after the enhancement of the resource exist,
• wherein the secondary site storage system has a plurality of nodes,
• wherein the enhancement of the resource includes scale-up which improves performance of the node and scale-out which increases a number of nodes, and
• wherein the management device determines which one of the scale-up and the scale-out is performed at the time of the resource enhancement.

A storage managing method performed by a computer system comprising:

• a primary site storage system in which a primary site providing a plurality of primary volumes to a host is configured;
• a secondary site storage system which is connected to the primary site storage system via a network and in which a secondary site providing a plurality of secondary volumes in which remote copies of the plurality of primary volumes are set is configured;
• and a management device managing the primary site storage system and the secondary site storage system, wherein
• the management device is configured to change a resource of the secondary site storage system,
• in a case where a failure occurs in the primary site, the management device performs a failover to make a corresponding secondary volume take over operation of the primary volume, controls so as to enhance a resource of the secondary site storage system, and controls the failover so that a secondary volume which starts operating by the failover before the enhancement of the resource and a secondary volume which starts operating by the failover after the enhancement of the resource exist, and
• the management device:
• holds recovery requirement information indicating a requirement of recovery with respect to the plurality of secondary volumes;
• and
• determines a timing of performing a failover and starting operation, which is either before or after enhancement of the resource, for each of the secondary volumes on a basis of a surplus resource of the secondary site storage system and the recovery requirement information.