Figure 73 Mapping Tfovs, Tfo Groups, And Ca Port Pairs; Table 44 Storage Cluster Function Specifications - Fujitsu ETERNUS DX100 S4 Design Manual

3. SAN Functions
Stable Operation via Load Control
TFOVs are mirrored and maintained equally as a pair in the Primary storage and the Secondary
storage. Because the remote copy technology is using synchronization, to mirror between storage
systems, besides configuring the Storage Cluster-related settings, the copy path must also be set.

Figure 73 Mapping TFOVs, TFO Groups, and CA Port Pairs

CA#0
TFOV#0
TFOV#1
Primary storage
• TFOV
Transparent Failover Volume (TFOV) is a volume in which the Storage Cluster setting is per-
formed. Server access is possible even when a failover occurs.
TFO group
•
A Transparent Failover (TFO) group is the operations unit for a failover in a single ETERNUS
DX/AF, and a Storage Cluster failover is performed for each group.
A TFO group has two states. "Active" indicates that access from a business server is enabled and
"Standby" indicates that access from a business server is disabled.
CA port pair
•
By sharing the WWPN/WWNN for the FC or by sharing the IP address and iSCSI name for the iSC-
SI with the CA ports of two ETERNUS DX/AF storage systems, the Storage Cluster function per-
forms a failover by controlling the Link status of each CA port.
This pair of CA ports that share the WWPN and WWNN, or the IP address and iSCSI name is
called a CA port pair.
If a different IP address is used for the CA port pair with iSCSI, a failover and failback must be
performed manually so that the Primary storage and the Secondary storage recognize the
path.
The following table provides the function specifications for the Storage Cluster.

Table 44 Storage Cluster Function Specifications

Item
Number of connectable storage systems
Fujitsu Storage ETERNUS DX100 S4/DX200 S4, ETERNUS DX100 S3/DX200 S3 Hybrid Storage Systems Design Guide (Basic)
CA port pair
CA#1
TFOV#2
TFO group
Copyright 2023 Fujitsu Limited
CA port pair
CA#0
TFOV#0
TFOV#1
Create
an association
Secondary storage
Specifications
1
126
CA#1
TFOV#2
TFO group
P3AM-7642-32ENZ0