Figure 24 Ftrp Balancing - Fujitsu ETERNUS DX S5 Series Design Manual

2. Basic Functions
Operations Optimization (Virtualization/Automated Storage Tiering)
FTRP Balancing
When drives are added to a pool, the physical capacity may be 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 disks in the pool can be balanced. Balancing can be performed by selecting the FTRP to be
balanced in ETERNUS Web GUI and ETERNUS CLI.
Figure 24 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 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.
FTSP#0
RAID RAID
group#1 group#2
FTSP#0
RAID RAID
group#1 group#2
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
70
Added
RAID RAID
group#5 group#6
RAID RAID
group#5 group#6
for details
Design Guide