HP Insight Cluster Management Utility manual Comments on High Availability HA

When a node is added to the diskless logical group

•A copy of the snapshot directory for this node is sent to the NFS server.

•A PXE-boot file is created in the TFTP pxelinux.cfg directory that instructs the kernel to obtain its root file system from the assigned NFS server.

IMPORTANT:

When booting the computes nodes in a large-scale diskless cluster, only one DHCP and TFTP server are available for the cluster. HP recommends booting no more than 256 nodes at a time to avoid DHCP and TFTP timeouts.

NOTE:

Any data written from the compute nodes is stored on the respective NFS server for each node. HP Insight CMU does not aggregate this data back to the HP Insight CMU management node.

4.8.15 Comments on High Availability (HA)

Configuring an HA solution for the additional NFS servers is beyond the scope of the procedure described in “Configuring additional NFS servers” (page 63).

If HA NFS servers are needed, then configure the HA solution on the NFS servers during step #2 in“Configuring additional NFS servers” (page 63) so the servers are ready for use by step #6. When configuring the NFS server IP addresses in step #5 of “Configuring additional NFS servers” (page 63), use the alias IP address for the NFS server that is managed by the HA solution.

4.8 HP Insight CMU diskless environments 65