HP XC System Software Administration Guide Version 3.0

15. Mounting File Systems
This chapter provides information and procedures for performing tasks to mount file systems that are internal
and external to the HP XC system. It addresses the following topics:
• Overview of the Network File System on the HP XC System (page 139)
• Understanding the Global fstab File (page 139)
• Mounting Internal File Systems Throughout the HP XC System (page 141)
• Mounting Remote File Systems (page 144)
Overview of the Network File System on the HP XC System
The HP XC System Software supports Network File System (NFS) 3 client and server functionality.
NFS files can be shared between the nodes of the HP XC system or can be shared between the HP XC system
and an external system. External NFS files can be shared with any node having a direct external network
connection. It is also possible to set up NFS to import external files to nodes of the HP XC system without
external network connections, by routing through a node with an external network connection.
You can use either the HP XC administrative network or the HP XC system interconnect for NFS operations.
The system interconnect can potentially offer higher performance, but only at the potential expense of the
performance of application communications.
The ports for the RPC services used by NFS are tied to specific port numbers in the HP XC System Software,
as shown in Table 15-1..
Table 15-1. NFS Daemon Ports NFS Daemon Ports
PortNFS Daemon
4000rpc.statd
4001rpc.lockd
4002rpc.mountd
4003rpc.rquotad
Understanding the Global fstab File
The /hptc_cluster/etc/fstab.proto file is used to construct the actual /etc/fstab file for each
node of the HP XC system, which in turn dictates which file systems are mounted. This occurs when the
cluster_fstab service is started or restarted, and at system boot. The following command restarts this
service:
# service cluster_fstab restart
You can edit the fstab.proto file to designate the mounting instructions for a given node, for a group of
nodes, or for all the nodes in HP XC system; the fstab.proto file follows the same syntax as the
/etc/fstab file. Do not edit any /etc/fstab files.
The fstab.proto file comprises individual portions that correlate to the nodes. The first portion is designated
as ALL; all the lines in this portion are copied to the /etc/fstab file of all the nodes. Subsequent portions
are designated for a specified node or nodes. Subsequent portions must begin with the lowest numbered
node in the HP XC system and progress to the head node, which is the highest numbered node. The lines
in each portion are copied to the corresponding node. Example 15-1. depicts the fstab.proto file.
Overview of the Network File System on the HP XC System 139