Hp StorageWorks Scalable File Share User Manual download pdf (Page 35)

3.5.2 Creating the /etc/hosts file

Create an /etc/hosts file with the names and IP addresses of all the Ethernet interfaces on

each system in the file system cluster, including the following:

• Internal interfaces

• External interface

• iLO interfaces

• InfiniBand or 10 GigE interfaces

• Interfaces to the Fibre Channel switches

• MSA2000 controllers

• InfiniBand switches

• Client nodes (optional)

Propagate this file should be to all nodes in the file system cluster.

3.5.3 Configuring pdsh

The pdsh command enables parallel shell commands to be run across the file system cluster.

The pdsh RPMs are installed by the HP SFS G3.2-0 software installation process, but some

additional steps are needed to enable passwordless pdsh and ssh access across the file system

cluster.

1. Put all host names in /opt/hptc/pdsh/nodes.

2. Verify the host names are also defined with their IP addresses in/etc/hosts.

3. Append /root/.ssh/id_rsa.pub from the node where pdsh is run to

/root/.ssh/authorized_keys on each node.

4. Enter the following command:

# echo "StrictHostKeyChecking no" >> /root/.ssh/config

This completes the process to run pdsh from one node. Repeat the procedure for each additional

node you want to use for pdsh.

3.5.4 Configuring ntp

The Network Time Protocol (ntp) should be configured to synchronize the time among all the

Lustre file system servers and the client nodes. This is primarily to facilitate the coordination of

time stamps in system log files to easily trace problems. This should have been performed with

appropriate editing to the initial Kickstart configuration file. But if it is incorrect, manually edit

the /etc/ntp.conf file and restart the ntpd service.

3.5.5 Configuring User Credentials

For proper operation, the Lustre file system requires the same User IDs (UIDs) and Group IDs

(GIDs) on all file system clients. The simplest way to accomplish this is with identical

/etc/passwd and /etc/group files across all the client nodes, but there are other user

authentication methods like Network Information Services (NIS) or LDAP.

By default, Lustre file systems are created with the capability to support Linux file system group

access semantics for secondary user groups. This behavior requires that UIDs and GIDs are

known to the file system server node providing the MDS service, and also the backup MDS node

in a failover configuration. When using standard Linux user authorization, you can do this by

adding the lines with UID information from the client /etc/passwd file and lines with GID

information from the client /etc/group file to the /etc/passwd and /etc/group files on

the MDS and backup MDS nodes. This allows the MDS to access the GID and UID information,

but does not provide direct user login access to the file system server nodes. If other user

authentication methods like NIS or LDAP are used, follow the procedures specific to those

methods to provide the user and group information to the MDS and backup MDS nodes without

3.5 Configuration Instructions 35

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