Virtualization system and area allocation control method

Details Virtualization system and area allocation control method Virtualization system and area allocation control method

2006-11-28

2010-10-12

Ellis, Kevin L (Department: 2187)

Electrical computers and digital processing systems: memory

Storage accessing and control

Memory configuring

C711SE12001, C711S162000, C711S172000

Reexamination Certificate

active

07814289

ABSTRACT:
A virtualization system, upon judging that a write operation from a higher-level device is an operation to write in the format of the virtual volume, even when the write position of the write operation is in a virtual area different from a virtual area to which an allocated actual area has been allocated, if there is an unused area in the allocated actual area, writes management information to the unused area according to the write operation, and if there is no unused area in the allocated actual area, newly allocates an unallocated actual area, and writes management information to the newly allocated actual area according to the write operation.

REFERENCES:
patent: 2004/0260861 (2004-12-01), Serizawa et al.
patent: 2005/0021562 (2005-01-01), Idei et al.
patent: 0 375 188 (1990-06-01), None
Machine Translation JP 2006-263940.
European Search Report of Patent Application No. 07251384.9 mailed Apr. 23, 2010.

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