606 DS8800 Performance Monitoring and Tuning
If you take a FlashCopy at the recovery site in your Global Copy implementation, consider the
influence between Global Copy and the FlashCopy background copy. If you use the
FlashCopy with the nocopy option at the recovery site, when the Global Copy target receives
an update, the track on the FlashCopy source, which is also the Global Copy target, must be
copied to the FlashCopy target before the data transfer operation completes. This copy
operation to the FlashCopy target can complete by using the DS8000 cache and NVS without
waiting for a physical write to the FlashCopy target. However, this data movement can
influence the Global Copy activity. So, when considering the network bandwidth, consider ...