Use the FC Ext. Slower Copy1 option to give priority to host I/O response over background copy processing of Compatible FlashCopy® relationships.
When the FC Ext. Slower Copy1 option is enabled and MP unit usage exceeds 65%, background copy operations are suppressed, thus host I/O response improves.
When Compatible FlashCopy® background copy operations are suppressed by the FC Ext. Slower Copy1 option, the time required for background copying increases. When the FC Ext. Slower Copy2 option is enabled, the FC Ext. Slower Copy1 option is invalid.