Storage system and storage controller
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United States of America Patent
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Oct 21, 2008
Grant Date -
Mar 31, 2005
app pub date -
Feb 3, 2004
filing date -
Sep 29, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
A first storage controller has a multilayer memory hierarchy constructed by LDEV (logical device) connected from LUN, and VDEV (virtual device) connected to the lower order of the LDEV. At least one of the VDEVs is constructed by mapping the memory resources arranged in external storage controllers. The functions of a stripe, RAID, etc. can be added in the mapping. Various kinds of functions (remote copy, variable volume function, etc.) applicable to the normal internal volume can be also used in a virtual internal volume by using the external memory resource as the virtual internal memory resource so that the degree of freedom of utilization is raised.
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