HYDME1294I Premigration is a normal TS7700 Tape Attach or Cloud Attach operation however its impact can at times be reduced. Things to consider: 1. Increase premigration thresholds (PMPRIOR and PMTHLVL for TS7700T or TS7740, and CLDPRIOR for TS7700C) which can help defer when the TS7700 Tape Attach or TS7700 Cloud Attach enters the sustained steady state. 2. Consider increasing the number of premigration drives per pool to improve efficiency of premigration during the steady state period. (TS7700T or TS7740) 3. Consider increasing the number of cloud premigration to improve efficiency of premigration during the steady state period. (TS7700C only) 4. Consider decreasing other inbound and/or outbound workloads such as grid replication through deferred copy throttling. 5. Consider purchasing more FC5274 or FC5279. (TS7700T or TS7700C) 6. Consider increasing size of the cache partitions. (TS7700T or TS7700C) 7. Consider decreasing data in cache partition 0 (resident only partition) for over-spilled data from cache partition x. (TS7700T or TS7700C)