June 2004
Intermediate to advanced
342 pages
9h 3m
English
book
Understanding the IBM TotalStorage Open Software Family
by Roland Tretau, Joe A. Burnett, Norbert Engst, Kazue Okano
Content preview from Understanding the IBM TotalStorage Open Software Family
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Chapter 3. Storage virtualization 79
Image: Image mode sets up a one-to-one mapping of extents on an mDisk to
the extents on the vDisk. Because the vDisk has exactly the same extent
mapping as the underlying mDisk, any data already on the disk is still
accessible when migrated to an SAN Volume Controller environment. Within
the SAN Volume Controller environment, the data can (optionally) be
seamlessly migrated off the image mode vDisk to a striped or sequential
vDisk within a MDG.
SAN Volume Controller multipathing
Each SAN Volume Controller node presents a vDisk to the SAN via multiple
paths, usually four. In normal operation, two nodes provide ...
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