Disk control device and method processing variable-block and fixed-block accesses from host devices

摘要

The present intention is a disk control device and control method sharing an FBA disk unit between mainframes (global servers) using a variable-block format and open servers using a fixed-block format and which are host devices. The first host device using the variable-block format and the second host device using the fixed-block format connect individually through a dedicated first channel adapter and second channel adapter, respectively. The disk control device includes a conversion function between the variable-block format of the first host device and the fixed-block format of the disk unit. In addition, the second channel adapter includes a conversion function between the fixed-block format of the second host device and the variable-block format of the disk control device. These functions enable the first host device using the variable-block format and the second host device using the fixed-block format to share the resources of the disk unit.