PRIMECLUSTER Global Link Services Configuration and Administration Guide: Redundant Line Control Function 4.1 (for Linux)

5.1 Outline of Cluster System Support

In cluster system, Redundant Line Control Function supports the following operation modes:

• Active standby (1:1 and N:1)
• Mutual standby
• Cascade
• Priority transfer

How cluster failover is dealt with in each mode is shown below.

[Table 5.1 List of the cluster system compatible function]

Mode	Active Standby System (1:1)	Active Standby System (N:1)	Mutual standby System	Cascade System	Priority transfer system	Duplicate transfer path for SIS
Fast switching mode	A	A	A	A	A	X
NIC switching mode	A	A	A	A	A	A

[Meaning of the symbols] A: Supported X: Not supported

Virtual IP addresses allocated to virtual interfaces are taken over if a cluster switching event occurs. GLS does not provide any function to support MAC address takeover and system node name takeover. Table 5.2 indicates the support status of each takeover function.

[Table 5.2 Supported cluster take over information]

Cluster Operation mode	IP address	MAC address	IP address + MAC address	IP address + System node name	IP address + MAC address + System node name
1:1 Active standby	A	X	X	X	X
N:1 Active standby	A	X	X	X	X
Mutual standby	A	X	X	X	X
Cascade	A	X	X	X	X
Priority transfer	A	X	X	X	X

[Meaning of the symbols] A: Supported X: Not supported

• Configuring GLS as Priority transfer, one of the cluster operation, follows the same procedure for configuring Cascade operation.
• When using Fast switching mode, you need a host running Fast switching mode as an associate host other than a node configuring a Cluster system. Failover of Gls resource may fail if there is only one Cluster system configuring nodes on the transfer route monitoring host due to simultaneous detection of transfer route failure on operation node and standby node.
• Scalable configuration as well as standby configuration in High-availability scalable settings are not supported.

Figure 5.1 shows an example of cluster switching for the virtual interface

[Figure 5.1 Cluster Switching for the virtual interface]

The logical unit number for the virtual interface for cluster switching is 65 or later. (sha0:65, sha0:66)

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5.1.1 Active Standby

5.1.2 Mutual standby

5.1.3 Cascade

5.1.4 Monitoring resource status of standby node