GLYPH<SM590000> Easy Tier automatic data placement is not supported on image mode or sequential  volumes. However, it supports evaluation mode for such volumes. I/O monitoring is  supported and statistics are accumulated. GLYPH<SM590000> When a volume is migrated out of a storage pool that is managed with Easy Tier, Easy  Tier automatic data placement mode is no longer active on that volume. Automatic data  placement is also turned off while a volume is being migrated, even when it is between  pools that have Easy Tier automatic data placement enabled. Automatic data placement  for the volume is reenabled when the migration is complete. GLYPH<SM590000> When Easy Tier automatic data placement is enabled for a volume, you cannot use the  svctask migrateexts  CLI command on that volume. When the system migrates a volume from one storage pool to another, it attempts to  migrate each extent to an extent in the new storage pool from the same tier as the original  extent, if possible. The Easy Tier function is enabled by default. It starts monitoring I/O activity immediately after  storage pools and volumes are created. It also starts extent migration when the necessary I/O  statistics are collected.  A few parameters can be adjusted. Also, Easy Tier can be disabled on selected volumes in  storage pools. The tier for internal (array) MDisks is detected automatically and depends on the type of  drives that are its members. No adjustments are needed. For an external MDisk, the tier is assigned when it is added to a storage pool. To assign the  MDisk, navigate to  Pools  External Storage , select the MDisk (or MDisks) to add and click  Assign . Note:  The tier of MDisks mapped from certain types of IBM System Storage Enterprise  Flash is fixed to tier0_flash and cannot be changed. Chapter 10. Advanced features for storage efficiency  433 MDisk settings 10.1.2 Implementing and tuning Easy Tier