HP XC System Software Installation Guide Version 3.2

Table 1-2 Role and Service Placement for Improved Availability (continued)
Special Considerations for Role Assignment
Service is Delivered in This
RoleService Name
Within the availability set, the higher numbered node is the
LVS director, and the lower numbered node is the backup for
the LVS director.
Thus, to achieve improved availability of the LVS director
service, you must assign at least three nodes with the login
role:
• Assign the login to the first node in the availability set.
• Assign the login role to the second node in the availability
set.
• Assign the login role to any other node in the system. This
node acts as a real server.
The nodes you associate into the availability set must have an
external Ethernet connection configured as well.
For more information about the login role, see “Login Role”
(page 212).
By default, the management_server role is installed on the
head node. If you want improved availability for Nagios, the
management_server role must be assigned to two nodes,
the head node and one additional node.
In this case, the head node cannot have the management_hub
and console_network roles assigned to it, so you must move
those roles to the other node in the availability set.
The other node in the availability set acts as a Nagios monitor
unless the Nagios master fails over; at that time the other node
acts both as a Nagios master and a Nagios monitor.
HP recommends that the other node in the availability set also
has an external Ethernet connection so that you can run the
Nagios web interface on it.
For more information about the management_server role,
see “Management Server Role” (page 213) .
management_server
Nagios master
To achieve improved availability of NAT, you must assign the
external role to both nodes in the availability set, and both
nodes must have a configured external Ethernet connection.
If you assign the external role to any other node that is not
part of an availability set, that node cannot act as a NAT server
because it cannot be managed by the availability tool.
During cluster_config processing, you are prompted to
supply the IP addresses of the NAT servers.
For more information about the external role See “External
Role” (page 212)
external
Network Address
Translation (NAT)
Configuring Improved Availability for the /hptc_cluster File System
To configure improved availability for the /hptc_cluster file system (service name
hptc_cluster_fs), use the HP StorageWorks Scalable File Share (SFS) software, which must
be purchased separately from HP. SFS is also required for successful fail over of the dbserver
service. During the HP XC Kickstart installation procedure, you are prompted to configure the
/hptc_cluster file system on a disk somewhere other than the head node. If you purchase
and configure SFS, you can locate the file system on SFS storage.
Configuring Failover Capabilities for SLURM and LSF-HPC with SLURM
Improved availability for SLURM and LSF-HPC with SLURM is not achieved through availability
sets or availability tools. Failover capabilities for SLURM and LSF-HPC with SLURM are achieved
1.9 Task 9: Plan a Service Availability Strategy 33