Chapter 9.4.7. Saving bandwidth creating Metro Mirror and Global Mirror relationships
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Chapter 9. Copy services 165 disabled. Starting the flash copy mapping will re- enable the cache, improving the VDisks’ performance for Global Mirror I/ O. 9.4.6 Using Metro Mirror or Global Mirror with FlashCopy SVC allows you to use a VDisk in a Metro Mirror or Global Mirror relationship as a source VDisk for a FlashCopy mapping. You cannot use a VDisk as a FlashCopy mapping target that is already in a Metro Mirror or Global Mirror relationship. When you prepare a FlashCopy mapping, the SVC puts the source VDisks into a temporary cache- disabled state. This temporary state adds additional latency to the Metro Mirror relationship, because I/ Os that ...
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