Building Disaster Recovery Serviceguard Solutions Using Metrocluster with Continuous Access XP P9000 for Linux B.01.00.00

command devices. The remote array RAID Manager instance at both sites use the remote command
devices.
• Configure a dedicated command device in the XP or P9000 array at the remote site that is
directly presented to the nodes in the local site over an extended SAN without using the XP
or P9000 external storage feature. Similarly, configure a command device in the remote site
XP or P9000 array and present it to the nodes of the local site over an extended SAN.
Figure 11 illustrates this configuration.
Figure 11 Configuring the command device over an extended SAN
Node 1
Array Array
Local Array
Remote Array Raid
CMD
CMD
Node 2
Local Array
Remote Array Raid
CMD
CMD
Raid manager
instance
In Figure 11 (page 31), a dedicated command device in the XP array is presented to all the nodes
of the remote site. The local array RAID Manager instance at both sites use its own command
devices. The remote array RAID Manager instance at every site uses the command device presented
to it from the remote XP array using extended SAN.
Configuring a remote array RAID Manager instance
A RAID Manager instance for a remote array must be created on all the nodes of every site. This
RAID Manager instance uses the command device that is configured to obtain the Continuous
Access device group status from the remote XP or P9000 array.
To configure a RAID Manager instance for the remote array:
1. Select a node in the site to create a remote array RAID Manager instance.
2. Edit the /etc/services file to add an entry for the remote array RAID Manager instance.
The format of the entry must be:
horcm<instance-number> <port_number>/udp
For Example,
horcm1 11001/udp #Raid Manager instance 1
NOTE: The UDP ports used for the local array RAID Manager and the remote array RAID
Manager must be different.
Remote array RAID manager instance 31