Fujitsu ETERNUS DX100 S4 Design Manual page 46

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 device or the target
volume.
Refer to "Combinations of Functions That Are Available for Simultaneous Executions" (page 203)
for details on the functions that can be executed simultaneously, the number of the process that
can be processed simultaneously, 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 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 for the TPP to which the TPVs be-
long. If this causes the total logical capacity of the TPVs in all the TPPs that include these work-
ing 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 performed if the capacity of the TPP to which the TPVs belong is expanded.
Fujitsu Storage ETERNUS DX100 S4/DX200 S4, ETERNUS DX100 S3/DX200 S3 Hybrid Storage Systems Design Guide (Basic)
46
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