Fujitsu ETERNUS DX S5 Series Design Manual page 71

2. Basic Functions
Operations Optimization (Virtualization/Automated Storage Tiering)
Caution
• If the free capacity in the FTSP becomes insufficient while FTRP balancing is being performed, an
error occurs and the balancing session ends abnormally. Note that insufficient physical capacity
cannot be replaced by other FTSPs.
• When FTRP balancing is performed, an area for the work volume (the destination FTV which has the
same capacity as the source FTV) is secured in the FTRP to which the FTV belongs. As a result, the
status of the FTRP may temporarily become alarm status (the FTRP usage exceeds the "Caution" or
"Warning" threshold). This alarm state is removed once balancing is completed successfully.
• If the capacity of the FTRP is expanded during an FTRP balancing process, the balancing level might
be less than before.
• FTRP balancing may not be performed regardless of what FTRP balancing level is used. FTRP
balancing availability depends on the physical allocation status of FTVs.
71 Design Guide