Linking with ETERNUS SF Storage Cruiser significantly reduces the operation workload on the system administra-
tor when applying the QoS function because performance designing and tuning are automatically performed.
Figure 64 QoS
ETERNUS AF
Server B
High priority
Server A
Low priority
Affects the performance of B
I/O performance
High
I/O performance
High
Server A
Server B
Processing requests
from A increase
Required performance for A
Required performance for B
Server A
Server B
The workload does not exceed
the upper limit even when
processing requests from A
increase
Workload upper limit for A
Workload upper limit for B
Because the w
orkload for A, which has a low
priority, significantly increases, the required
performance for B cannot be maintained
Because the workload for A is lower than
the upper limit, the workload for B, which has
a high priority, can be reduced
When QoS is not applied
When QoS is applied
● REC Bandwidth Limit (Remote Copy QoS)
A bandwidth upper limit can be set for each copy path in the remote copy session.
Even if a specific path fails, the line bandwidth can be maintained without centralizing the load to other paths.
The bandwidth limit can be specified in increments of Mbit/s.
Figure 65 Copy Path Bandwidth Limit
Normal operation
ETERNUS AF
Effective line speed
400Mbit/s
QoS
200Mbit/s
REC path setting
RA
200Mbit/s
RA
1 path fails
ETERNUS AF
Effective line speed
400Mbit/s
QoS
200Mbit/s
REC path setting
RA
200Mbit/s
RA
Failure
200Mbit/s
200Mbit/s 200Mbit/s
Even if a
specific path
fails, steady load can
be maintained
1. Function
Stable Operation via Load Control
103
FUJITSU Storage ETERNUS AF250 S2, ETERNUS AF250 All-Flash Arrays
Design Guide (Basic)
Copyright 2019 FUJITSU LIMITED
P3AG-1822-09ENZ0
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