Electrical computers and digital processing systems: memory – Storage accessing and control – Memory configuring
Reexamination Certificate
2005-10-17
2011-10-04
Thai, Tuan V. (Department: 2185)
Electrical computers and digital processing systems: memory
Storage accessing and control
Memory configuring
C711S100000, C711S111000, C711S154000
Reexamination Certificate
active
08032729
ABSTRACT:
Transfer of data and replication of data among several storage devices are executed without imposing a load on the computer connected to the storage system. For example, a first host computer monitors usage rates of transfer groups TG11, TG12and physical path usage rate on a storage device interconnect physical path50, and when either a usage rate or physical path usage rate goes above a predetermined value, issues to the first storage device20an instruction to allocate a reserved volume R11, R12. The first host adaptor21receiving the reserved volume R11, R12allocation request allocates reserved volume R11to transfer group TG1, whereby a virtual transfer volume is formed by transfer volume T11and the reserved volume R11allocated thereto. Capacity of the virtual transfer volume is increased by the equivalent of the reserved volume R11capacity, so that additional transfer frames may be stored.
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Sanrad Application Note: Data Migration Solution Transferring Data Between Storage Systems over Fibre-channel or SCSI connections, copyright Sanrad 2003, 9 pages.
Hiraiwa Yuri
Maki Nobuhiro
Miyata Katsuhisa
Sato Masahide
Antonelli, Terry Stout & Kraus, LLP.
Hitachi , Ltd.
Thai Tuan V.
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