Fujitsu ETERNUS AF250 Design Manual page 50

1. Function
Operations Optimization (Deduplication/Compression and Storage Virtualization)
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Balancing Level
The TPV balance status is displayed by three levels; "High", "Middle", and "Low". "High" indicates that the physi-
cal 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 device or the target volume.
Refer to "Combinations of Functions That Are Available for Simultaneous Executions" (page 167)
the functions that can be executed simultaneously, the number of the process that can be processed simultane-
ously, and the capacity that can be processed concurrently.
When a TPP has RAID groups unavailable for the balancing due to lack of free space, etc., the physical allo-
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cation 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
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capacity as the migration source) are secured for the TPP to which the TPVs belong. If this causes the total
logical capacity of the TPVs in all the TPPs that include these working volumes to exceed the maximum pool
capacity, 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 completes successfully.
While TPV balancing is being performed, the balancing level may become lower than before balancing was
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performed if the capacity of the TPP to which the TPVs belong is expanded.
FUJITSU Storage ETERNUS AF250 S2, ETERNUS AF250 All-Flash Arrays Design Guide (Basic)
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