Red Hat GLOBAL FILE SYSTEM 4.7 Guida Utente Scaricare il pdf (Pagina 101)

File system mounting issues 7–5

To configure Lustre to use a different port on the client node when using a Myrinet interconnect, perform the

following steps:

1. On the administration server and on the MDS server in the HP SFS system, perform the following

tasks:

a. Stop all file systems, by entering the stop filesystem filesystem_name command for

each file system.

b. Back up the /etc/modprobe.conf file, as follows:

# cp /etc/modprobe.conf /etc/modprobe.conf.save

c. Edit the /etc/modprobe.conf file to add the following line:

options kgmnld port=port_number

where port_number is the number of the port that Lustre is to use. HP recommends that you

use a high-numbered port, for example, port 15 if there are 16 ports available.

2. Change the RAM disk for the Object Storage Servers as follows:

a. Copy the /etc/modprobe.conf file from one of the Object Storage Servers to the

administration server and back it up, by entering the following commands on the administration

server:

# scp root@oss_name:/etc/modprobe.conf /tmp/modprobe.conf

# cp /tmp/modprobe.conf /tmp/modprobe.conf.ost.save

b. Edit the /tmp/modprobe.conf file to add the following line:

options kgmnld port=port_number

c. Update the RAM disk image with the changed /etc/modprobe.conf file by using the

hplsrdu(8) command as follows:

# hplsrdu -c /tmp/modprobe.conf /etc/modprobe.conf

Save modified ramdisk/PXE config ? [y|n] y

3. Reboot all Object Storage Servers in the HP SFS system, as shown in the following example. In this

example, there are four Object Storage Servers, south3 through south6:

sfs> shutdown server south[3-6]

sfs> boot server south[3-6]

4. On each client node, edit the /etc/modprobe.conf file or the /etc/modules.conf file

(depending on the distribution) to add the following line:

options kgmnld port=port_number

5. Reboot the client nodes.

7.2.3 Determine whether Lustre is mounted on a client node

To determine whether Lustre is mounted on a client node, enter the sfsmount command, as shown in the

following example. The command shows details of the Lustre devices that are mounted on the node. In this

example, /mnt/lustre is the mount point of the Lustre file system:

# sfsmount

data on /mnt/lustre type lustre (rw,osc=lov1,

mdc=MDC_client0_mds1_MNT_client_elan)

7.2.4 The SFS service is unable to mount a file system (SELinux is not supported)

If the SFS service is unable to mount a file system, but the file system can be mounted using the sfsmount

command, it may be because the SELinux security feature is enabled on the client node. To work around

this problem, disable the SELinux feature by editing the /etc/sysconfig/selinux and change the

SELINUX setting to disabled. Reboot the client node to bring the change into effect.

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