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InfoScale™ 9.0 Replication Administrator's Guide - AIX

Last Published: 2025-04-14

Product(s): InfoScale & Storage Foundation (9.0)

Platform: AIX

Adding the IP and NIC resources for IPv6 addresses in the RVG agent group when VCS global clustering and VVR agents are configured in the presence of a bunker

Currently, replication between the Primary and Secondary sites uses an IPv4 network. Before you can migrate the network to IPv6, you must add the IP and NIC resources to VCS control. You can do this in one of the following ways:

Add new IP and NIC resources for IPv6 in the RVG group.
Modify the current IP and NIC resources in the RVG group.

The first method, adding new IP and NIC resources for IPv6, ensures high availability. For example, suppose you add resources for IP and NIC resources for IPv6 addresses in the main.cf on the node in the Primary site from where replication is active. If the Primary site crashes before VVR migration to IPv6 from IPv4, the application service group fails over to the other node in the Primary site and replication continues using the IPv4 address. The existing IP and NIC resources are still in the main.cf file.

The second method, modifying the current IP and NIC resources, hampers replication. If a node in the Primary site crashes as you modify the existing IP resource, the original IPv4 virtual IP is lost. The application service group fails over to the other node, but the IPv4 IP address does not come online on the other node because you changed the IP resource from an IPv4 address to an IPv6 address. Instead, the IPv6 IP comes online. However, VVR is not configured use the IPv6 IP for replication, and replication pauses or stops. The IPv4 IP is not available on the other node.

To add the IP and NIC resources on the Primary and Secondary sites

Make the VCS configuration writeable. Enter the following:
```
# haconf -makerw
```

Add the NIC resource for the IPv6 address and configure the related attributes:

# hares -add nicres_v6 NIC VVRGRP
VCS NOTICE V-16-1-10242 Resource added. 
Enabled attribute must be set before agent monitors
# hares -modify nicres_v6 Enabled 1
# hares -modify nicres_v6 Device en2
# hares -modify nicres_v6 NetworkHosts \
  fd4b:454e:205a:111:211:43ff:feaa:af71
# hares -modify nicres_v6 Protocol IPv6
# hares -probe nicres_v6 -sys swax25
# hares -probe nicres_v6 -sys swax26

Add the IP resource for the IPv6 address and configure the related attributes:

# hares -add ipres_v6 IP VVRGRP
VCS NOTICE V-16-1-10242 Resource added. 
Enabled attribute must be set before agent monitors
# hares -modify ipres_v6 Enabled 1
# hares -modify ipres_v6 Device en2
# hares -modify ipres_v6 Address \
  fd4b:454e:205a:111:211:43ff:feaa:af70
# hares -modify ipres_v6 PrefixLen 64
# hares -probe ipres_v6 -sys swax25
# hares -probe ipres_v6 -sys swax26
# hares -online ipres_v6 -sys swax25
# hares -link ipres_v6 nicres_v6
# hares -link res_rvg ipres_v6

Save your configuration changes. Enter the following:
```
# haconf -dump -makero
```

After you add the IP and NIC resources to the Primary and Secondary sites, display the RVG agent group in the main.cf file to verify your changes.

group VVRGRP (
        SystemList = { swax25 = 0, swax26 = 1 }
        AutoStartList = { swax25, swax26 }
        )

        DiskGroup res_dg (
                DiskGroup = hrdg
                )

        IP ipres_v6 (
                Device = en1
                Address = "fd4b:454e:205a:111:211:43ff:feaa:af70"
                PrefixLen = 64
                )

        IP ipres (
                Device = en0
                Address = "10.209.87.170"
                NetMask = "255.255.252.0"
                )

        NIC nicres_v6 (
                Device = en1
                NetworkHosts = { "fd4b:454e:205a:111:211:43ff:feaa:af71" }
                Protocol = IPv6
                )

        NIC nicres (
                Device = en0
                NetworkHosts = { "10.209.121.1" }
                )

        RVG res_rvg (
                RVG = hr_rvg
                DiskGroup = hrdg
                )

        ipres_v6 requires nicres_v6
        ipres requires nicres
        res_rvg requires ipres_v6
        res_rvg requires res_dg
        res_rvg requires ipres

Verify the new network configuration. Enter the following:
```
# ifconfig -a
```
Display a summary of all the HA groups. Enter the following:
```
# hastatus -sum
```
Add the IP and NIC resources in the VCS configuration on the Secondary site. Use a different IP address on the Secondary site for IPv6 resources. For example, the IPv4 virtual IP address could be 10.209.87.171 and the IPv6 virtual IP address could be fd4b:454e:205a:111:211:43ff:feaa:af71.

To add the IP and NIC resources for IPv6 in the VCS configuration on the bunker site

Optionally, display information on your current configuration.

To display a summary of the HA groups on the bunker site, enter the following:
```
# hastatus -sum
```
To display the current network configuration on the bunker site, enter the following:
```
# ifconfig -a
```

Display the Service Group of the virtual IP on the bunker site. The following is a sample configuration:

group VVRGRP (
        SystemList = { swax29 = 0 }
        AutoStartList = { swax29 }
        )

        IP ipres (
                Device = en0
                Address = "10.209.87.202"
                NetMask = "255.255.252.0"
                )

        NIC nicres (
                Device = en0
                NetworkHosts = { "10.209.84.1" }
                )

        ipres requires nicres


        // resource dependency tree
        //
        //      group VVRGRP
        //      {
        //      IP ipres
        //          {
        //          NIC nicres
        //          }
        //      }

Make the VCS configuration writeable. Enter the following:
```
# haconf -makerw
```

Add the NIC resource for the IPv6 address and configure the related attributes. Enter the following:

# hares -add nicres_v6 NIC VVRGRP
VCS NOTICE V-16-1-10242 Resource added. 
Enabled attribute must be set before agent monitors
# hares -modify nicres_v6 Enabled 1
# hares -modify nicres_v6 Device en1
# hares -modify nicres_v6 NetworkHosts \
  fd4b:454e:205a:111:211:43ff:feaa:af28
# hares -modify nicres_v6 Protocol IPv6
# hares -probe nicres_v6 -sys swax29
# hares -link ipres_v6 nicres_v6
# hares -online ipres_v6 -sys swax29

Add the IP resource for the IPv6 address and configure the related attributes. Enter the following:

# hares -add ipres_v6 IP VVRGRP
VCS NOTICE V-16-1-10242 Resource added. 
Enabled attribute must be set before agent monitors
# hares -modify ipres_v6 Enabled 1
# hares -modify ipres_v6 Device en1
# hares -modify ipres_v6 Address \
  fd4b:454e:205a:111:211:43ff:feaa:af72
# hares -probe ipres_v6 -sys swax29

Save your configuration changes. Enter the following:
```
# haconf -dump -makero
```
Verify your changes on the bunker site. To display the updated network configuration, enter the following:
```
# ifconfig -a
```