HP XC System Software Installation Guide Version 2.1

Enter the number that corresponds to the role or roles you want to

assign to this node. Use a space-separated list to specify multiple roles,

for example,135.Or,enter c to cancel.

Assume you want to add a login role to node n15. Not only do you enter th e number 4,you

must also enter the numbers 1 and 6 to retain the curre nt compute and nat_client roles on

node n15. Basically, you have to supply every role that you want to assign to the node. Thus,

your entry looks like this:

Enter the number that corresponds to the role or roles you want

to assign to this node. Use a space-separated list to specify multiple

roles, for example,135.Or,enter c to cancel.

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Roles to be assigned: compute login nat_client

[R]eassign Roles, [O]k, [C]ancel :

At this point you have the following options:

• Enter the letter o to accept the role assignm ents you just made.

• Enter the letter r to start the assignment process again. The Reassign Roles option

does not apply the role assignments, it simply allows you to go back to the list of roles and

make adjustments to the role assignments.

• Enter the letter c to cancel the operation and make no changes to the currently assigned

roles.

I.4 Node Role Definitions

Anoderoleisdefinedbytheservicesthatthenodesupplies. Theroleisanabstractionthat

combines one or more services into a g roup. Node roles are characterized as follows:

• Compute

• Login

•I/O

• Management hub

• External

• Node management

• Resource management

• Common

• NAT client

You

can define multiple roles on any node. The head node, in particular, can have all of

ese roles if you are setting up a small cluster. Roles provide a co nvenient way of installing

rvices on a node.

The default installation defines every node with the compute role, the common role, and the

nat_client role, and all roles except the login role are applied to the head node.

The following sections d efine these roles.

I.4.1 Compute Role

All nod es by default a re defined with th e compute role. It is the administrator’s respo nsibility

to remove this role on a node if it is not wanted or required.

Jobs are distributed an d run on nodes with the compute role. T his role provides the services

required for the nod e to be an allocated resource of the SLURM Central Control Service

(slurmcd).

Using the Configuration Menu I-3