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Mounting and unmounting Lustre file systems on client nodes4–16

4.9 Restricting interconnect interfaces on the client node

When a Gigabit Ethernet interconnect is used to connect client nodes to an HP SFS system, the default

behavior is for only the first Gigabit Ethernet interface on a client node to be added as a possible network

for file system traffic.

To ensure that the correct interfaces on the client node are available for file system traffic, you must ensure

that the options lnet settings in the /etc/modprobe.conf.lustre or

/etc/modules.conf.lustre file are correct. Use the sfsconfig command to set the options, or see

Appendix B for information on setting the options manually.

4.10 File system service information and client communications

messages

You can use the sfslstate command to view information on the connection state of file system services

on a client node; see Section 4.10.1 for more information.

Messages relating to communications failures and recovery are displayed in the /var/log/messages

files. See Section 4.10.2 for examples and explanations of these messages.

Refer to Chapter 4 of the HP StorageWorks Scalable File Share System User Guide for more information on

file system states with reference to client connections.

4.10.1Viewing file system state information using the sfslstate command

When Lustre mounts a file system on a client node, the node has a connection with the MDS service and

with each OST service used by the file system. You can use the sfslstate command to view information

on the state of each of these connections.

The syntax of the sfslstate command is as follows:

sfslstate [filesystem_name] [-v]

To view a summary of connection states for all file systems on a client node, enter the sfslstate command

without arguments on the node, as shown in the following example. In this example, there are two file

systems, data and scratch:

# sfslstate

data: MDS: FULL OSTs: FULL

scratch: MDS: FULL OSTs: FULL

To display information about one file system, specify the name of the name of the file system with the

sfslstate command, as shown in the following example. Note that you must enter the name of the file

system, not the mount point:

# sfslstate data

data: MDS: FULL OSTs: FULL

To display information about each OST service, specify the -v option with the sfslstate command.

Note the following points regarding service connection states:

• The FULL state shows that the service is fully connected and operating normally. You will be able to

perform I/O operations to a file system where all services are in the FULL state.

• If an HP SFS service is not in the FULL state, the connection to that service is not operating normally.

Any attempts to perform I/O operations to the file system that uses the service will stall.

• During a mount request, it is normal for the NEW state to be shown.

• If a connection fails to establish immediately, the state of the connection alternates between the

CONNECT state and the DISCONN state.

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