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SAN Volume Controller: Best Practices and Performance Guidelines by

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Chapter 9.4.5. Diagnosing and fixing 1920 errors

Page 163

Chapter 9. Copy services 163 This is particularly important if you have a Global/ Metro Mirror relationship running ( that is synchronized) and the link fails ( thus, the mirror relationship suspends). When you restart the mirror relationship, the target disk will not be usable until the mirror catches up and becomes synchronized again. Depending on the amount of changes that need to be applied to the target and your bandwidth, this situation will leave you exposed without a usable target VDisk at all until the synchronization completes. To avoid this exposure, we recommend that you make a FlashCopy of the target VDisks before you restart the mirror relationship. At least this way, you ...

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