HP Insight Cluster Management Utility v7.1 User Guide

On SLES

# chkconfig nfsserver on

3. Ensure that enough NFS daemons and threads are configured to handle the anticipated volume

of NFS traffic.

On Red Hat

Set RPCNFSDCOUNT in the /etc/sysconfig/nfs file to the requested number of NFS

daemons. By default, RPCNFSDCOUNT=8.

On SLES

Set USE_KERNEL_NFSD_NUMBER in the /etc/sysconfig/nfs file, which defaults to 4.

HP recommends that the setting be at least half of the maximum number of compute nodes

served by each NFS server, and is typically a multiple of the total number of CPUs on the NFS

server. For more information and tips on tuning NFS, see NFS documentation.

4. HP recommends that you install one of these nodes, use HP Insight CMU to take a backup of

the node, and then clone this image to all of the NFS servers, including the node that was

initially installed. This approach ensures that all of the NFS servers are consistent with the

same /etc/ hosts file and with passwordless ssh configured for the root account. This is

required for the rest of the setup to succeed.

5. Scalable diskless support in HP Insight CMU is based on the presence of a single configuration

file: /opt/cmu/etc/cmu_diskless_nfs_servers. The existence and content of this file

enables the scalable diskless support in HP Insight CMU. Edit this file and insert the NFS

topology of the cluster. The syntax of this file supports HP Insight CMU node names and

network entities. Remember that HP Insight CMU network entities represent groups of nodes

on a common network switch. The acceptable formats of this file are:

Sample file:

[root@head ~]# cat /opt/cmu/etc/cmu_diskless_nfs_servers

172.20.0.5 n06 n07 rack1

172.20.0.50 encl3 encl4

[root@head ~]#

In this sample, node n06, node n07, and all of the nodes in the 'rack1' network entity obtain

the NFS-root file system from node n05 which has IP address 172.20.0.5. All nodes in the

'encl3' and 'encl4' network entities obtain the NFS-root file system from node n50, which has

IP address 172.20.0.50. Any diskless compute nodes that are not assigned to an NFS server

in this file obtain the NFS-root file system from the HP Insight CMU management node.

6. Proceed with the diskless installation procedure in “Populating the HP Insight CMU database”

(page 57). If the /opt/cmu/etc/cmu_diskless_nfs_servers file is detected, the

following additional actions occur:

When a diskless logical group is created

• Each additional NFS server gets a copy of the root file system from /opt/cmu/image/

<logical_group_name> on the HP Insight CMU management node.

• Each additional NFS server is configured to export the root/ and snapshot/

subdirectories from /opt/cmu/image/<logical_group_name>

• Additional TFTP subdirectories are created on the HP Insight CMU management node to

host the kernel and memory image booted by each additional NFS server.

• An additional PXE-boot OS description is configured on the HP Insight CMU management

node for each additional NFS server.

64 Provisioning a cluster with HP Insight CMU