Figure 74 Mapping TFOVs, TFO Groups, and CA Port Pairs
CA#1
Secondary storage
CA#0
Primary storage
TFOV#0
TFOV#1
TFO group TFO group
TFOV#2
CA#1CA#0
TFOV#0
TFOV#1
TFOV#2
CA port pair
CA port pair
Create
an as
sociation
• TFOV
Transparent Failover Volume (TFOV) is a volume in which the Storage Cluster setting is performed. 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 AF/DX, 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
The Storage Cluster function performs a failover by setting the same port identifier for the CA ports of two
ETERNUS AF/DX storage systems and by controlling the Link status of each CA port. The port identifier is
WWPN/WWNN for FC ports or an IP address and iSCSI name for iSCSI ports.
This pair of CA ports with the same WWPN/WWNN or the same IP address and iSCSI name is called a CA port
pair.
Note
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.
3. SAN Functions
Stable Operation
143 Design Guide
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