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 95
Figure 3-18 Conceptual block diagram showing SVC data flows
3.2.7 FlashCopy rules
There is a per I/O group limit of 16 TB on the quantity of source virtual disk
address space that may participate in FlashCopy mappings. This address space
is allocated in units of 8 GB, that is, creating a FlashCopy mapping between a
pair of virtual disks whose size is less than 8 GB consumes 8 GB of FlashCopy
mapping address space.
The maximum number of FlashCopy mappings that are supported is 512, which
is half the maximum number of vDisks, 1024, that are currently supported. This
means that there is a maximum of 512 source ...
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