HP XC System Software Installation Guide Version 4.0

The configuration and management database, in which all management configuration information
is stored, runs on a node with this role.
The power manager service manages the powering on and off of nodes in the system.
The MPI interconnect settings are managed by nodes running this role.
The image server service provides images from the SystemImager tool to all client nodes.
The NTP server synchronizes the time on all nodes.
The license manager service enables some software components in the system when a valid
license is present.
F.3.15 Resource Management Role
Nodes with the resource_management role provide the services necessary to support SLURM
and LSF.
On systems with fewer than 63 total nodes, this role is assigned by default to the head node. On
large-scale systems with more than 64 nodes, this role is assigned by default to the node with
the internal node name that is one less than the head node. For example, if the head node is n256,
node n255 is assigned as the resource manager. On large-scale systems, the
resource_management role is exclusive; the node with this role has no other roles assigned
to it.
The configuration and management database names of the services provided by this role are as
follows:
• LSF master node (lsf)
• SLURM central control service (slurm)
• Resource Management System (RMS) (rm)
You can assign this role to multiple nodes in the cluster to provide support for failover. Multiple
nodes may have this role defined, but only one is active at a time. If the SLURM central control
service fails on the active node, the daemon will be started on another node with the resource
management role.
F.3.16 Voltaire_hsm Role
This role defines where the optional Voltaire InfiniBand Host Based Subnet Manager runs. The
service associated with this role is called gvfm. For more information about when this role is
required, see Section F.2.1 (page 215).
HP recommends that you assign this role to the head node and another service node. Assigning
this role to another service node enables the Subnet Manager, and therefore the InfiniBand
network, to continue to function even if the head node is down.
Either the cisco_hsm or the voltaire_hsm roles might be present in a system, but not both.
F.3 Role Definitions 221