Figure 26 Ftrp Balancing - Fujitsu ETERNUS DX100 S4 Design Manual

2. Basic Functions
Operations Optimization (Virtualization/Automated Storage Tiering)
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 capaci-
ty as well as the usage rate of the physical disks in the pool can be balanced. Balancing can be per-
formed by selecting the FTRP to be balanced in ETERNUS Web GUI and ETERNUS CLI.

Figure 26 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 func-
tion can be used to evenly relocate the physically allocated capacity among RAID groups that con-
figure the same FTSP. Note that balancing cannot be performed if balancing migrates each physi-
cal 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 tar-
get 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.
Fujitsu Storage ETERNUS DX100 S4/DX200 S4, ETERNUS DX100 S3/DX200 S3 Hybrid Storage Systems Design Guide (Basic)
FTSP#0
RAID RAID
group#1 group#2
FTSP#0
RAID RAID
group#1 group#2
Copyright 2023 Fujitsu Limited
FTRP
Added
FTSP#0
RAID RAID
group#3 group#4
Physical capacity is balanced
amongst the RAID groups in each FTSP
Balancing
FTRP
FTSP#0
RAID RAID
group#3 group#4
53
Added
RAID RAID
group#5 group#6
RAID RAID
group#5 group#6
P3AM-7642-32ENZ0