Fujitsu ETERNUS DX S5 Series Design Manual page 63

2. Basic Functions
Operations Optimization (Virtualization/Automated Storage Tiering)
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Balancing Level
The TPV balance status is displayed by three levels; "High", "Middle", and "Low". "High" indicates that the
physical capacity of TPV is allocated evenly in the RAID groups registered in the TPP. "Low" indicates that the
physical capacity is allocated unequally to a specific RAID group in the TPP.
TPV balancing may not be available when other functions are being used in the ETERNUS DX or the target
volume.
Refer to "Combinations of Functions That Are Available for Simultaneous Executions" (page 325)
on the functions that can be executed simultaneously, the number of simultaneous executions, and the
capacity that can be processed concurrently.
Caution
• When a TPP has RAID groups unavailable for the balancing due to lack of free space, etc., the
physical allocation capacity is balanced among the remaining RAID groups within the TPP. In this
case, the balancing level after the balancing is completed may not be "High".
• By performing the TPV balancing, areas for working volumes (the migration destination TPVs with
the same capacity as the migration source) are secured in the TPP to which the TPVs belong. If the
maximum pool capacity of the ETERNUS DX has been exceeded by the total logical capacity of the
TPVs in all the TPPs that include the working volumes, a TPV balancing cannot be performed.
In addition, this may cause a temporary alarm state ("Caution" or "Warning", which indicates that
the threshold has been exceeded) in the TPP during a balancing execution. This alarm state is
removed once balancing is completed successfully.
• While TPV balancing is being performed, the balancing level may become lower than before
balancing was performed if the capacity of the TPP to which the TPVs belong is expanded.
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for details
Design Guide