SAN Volume Controller: Best Practices and Performance Guidelines

Chapter 8.3.2. Using underlying controller PiT copy with SVC cache-disabled VDisks

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126 SAN Volume Controller: Best Practices and Performance Guidelines Figure 8- 2 Cache- disabled VDisk in remote copy relationship 8.3.2 Using underlying controller PiT copy with SVC cache- disabled VDisks Where point- in- time ( PiT) copy is used in the underlying storage controller, the controller LUNs for both the source and target must be mapped through the SVC as image mode disks with the SVC cache disabled as shown in Figure 8- 3 on page 127. Note that of course it is possible to access either the source or the target of the FlashCopy from a host directly rather than through the SVC. Host Controller SVC presents VDisk to hosts as a LUN SVC at primary ...