US 9,811,274 B2
Storage control apparatus and copy control method
Hideyuki Kanai, Kawasaki (JP)
Assigned to FUJITSU LIMITED, Kawasaki (JP)
Filed by FUJITSU LIMITED, Kawasaki-shi, Kanagawa (JP)
Filed on Jul. 8, 2015, as Appl. No. 14/793,777.
Claims priority of application No. 2014-159980 (JP), filed on Aug. 6, 2014.
Prior Publication US 2016/0041779 A1, Feb. 11, 2016
Int. Cl. G06F 3/06 (2006.01); G06F 11/10 (2006.01)
CPC G06F 3/0619 (2013.01) [G06F 3/065 (2013.01); G06F 3/067 (2013.01); G06F 11/10 (2013.01); G06F 3/0656 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A storage control apparatus comprising:
a memory having a buffer region that stores, for each update generation, a data set for updating a copy source volume included in a first storage apparatus being a copy source; and
a processor that performs a procedure including:
storing, upon receiving a data set for updating the copy source volume, the data set in the buffer region, and storing, in the memory, correspondence relation information indicating a correspondence relation between a position where the data set is to be stored in the copy source volume and a position where the data set is stored in the buffer region; and
when transferring a data set from the first storage apparatus to a second storage apparatus being a copy destination, selecting a data set of an old update generation to be transferred among data sets stored in the buffer region, updating the copy source volume with the data set of the old update generation, deleting the data set of the old update generation from the buffer region, and also deleting correspondence relation information corresponding to the data set of the old update generation from the memory; and
when a capacity of the buffer region runs short, creating and storing in the memory, update record information indicating whether an update has been made for each predetermined area in the copy source volume based on a predetermined data set of an old update generation that is older than any other data set stored in the buffer region, updating the copy source volume with the predetermined data set of the old update generation according to the correspondence relation information, deleting the predetermined data set of the old update generation from the buffer region, also deleting correspondence relation information corresponding to the predetermined data set of the old update generation from the memory, and transferring the predetermined data set of the old update generation stored in the copy source volume to the second storage apparatus, based on the update record information.