Figure 28 Ftrp Balancing - Fujitsu ETERNUS AF250 Design Manual

1. Function
Operations Optimization (Deduplication/Compression and Storage Virtualization)
FTRP Balancing
When drives are added to a pool, the physical capacity is allocated unevenly among the RAID groups in the pool.
By using the Flexible Tier Pool balancing function, the allocated physical capacity as well as the usage rate of
the physical drives in the pool can be balanced. Balancing can be performed by selecting the FTRP to be bal-
anced in ETERNUS Web GUI and ETERNUS CLI.

Figure 28 FTRP Balancing

FTSP#0
RAID
group#0
FTSP#0
RAID
group#0
FTRP balancing is a function that evenly relocates the physically allocated capacity of FTVs amongst the RAID
groups that configure the FTSP.
Allocation of FTSPs is determined based on a performance analysis by Automated Storage Tiering function of
ETERNUS SF. This plays an important role for performance. The FTRP balancing function can be used to evenly
relocate the physically allocated capacity among RAID groups that configure the same FTSP. Note that balancing
cannot be performed if balancing migrates each physical area to other FTSPs.
●
Balancing Level
"High", "Middle", or "Low" is displayed for the balance level of each FTSP.
"High" indicates that the physical capacity is allocated evenly in the RAID groups registered in the FTSP. "Low"
indicates that the physical capacity is allocated unequally to a specific RAID group in the FTSP.
FTRP 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.
FTSP#0
RAID RAID
group#1 group#2
FTSP#0
RAID RAID
group#1 group#2
FUJITSU Storage ETERNUS AF250 S2, ETERNUS AF250 All-Flash Arrays Design Guide (Basic)
Copyright 2019 FUJITSU LIMITED
FTRP
Added
FTSP#0
RAID RAID
group#3 group#4
Physical capacity is balanced
Balancing amongst the RAID groups in each FTSP
FTRP
FTSP#0
RAID RAID
group#3 group#4
56
Added
RAID RAID
group#5 group#6
RAID RAID
group#5 group#6
for details on
P3AG-1822-09ENZ0