Installing and configuring HP XC systems2–12

specifically the section titled Disabling Portals compatibility mode (when client nodes have been

upgraded).

3. On the head node in the HP XC system, edit the /etc/modprobe.conf.lustre file and change

the portals_compatibility setting to none.

4. Use the cluster_config utility to update the golden image with the modified

/etc/modprobe.conf.lustre file.

5. Propagate the modified /etc/modprobe.conf.lustre file to all nodes.

6. Remount the Lustre file systems on the nodes.

Repeat these steps on each HP XC system that accesses the HP SFS system.

2.4 Downgrading HP SFS client software on HP XC systems

The HP XC version on the client nodes must be capable of interoperating with the HP SFS server and client

versions. In addition, the HP SFS client version must be capable of interoperating with the HP SFS server

version on the servers in the HP SFS system. See Section 1.3.2 for details of which HP XC and HP SFS

versions can interoperate successfully.

See Section 1.3.2 for details of which HP XC and HP SFS versions can interoperate successfully.

To downgrade the HP SFS client software on the HP XC head node, perform the following steps:

1. Stop all jobs that are using Lustre file systems.

To determine what processes on the head node are using a Lustre file system, enter the fuser

command as shown in the following example, where /data is the mount point of the file system. You

must enter the command as root user; if you run the command as any other user, no output is

displayed:

# fuser -vm /data

USER PID ACCESS COMMAND

/data root 303 ..c.. su

user2 10993 ..c.. csh

user2 16408 ..c.. ssh

user3 22513 ..c.. csh

user3 31820 ..c.. res

user3 31847 ..c.. 1105102082.1160

user3 31850 ..c.. 1105102082.1160

user3 31950 ..c.. mpirun

user3 31951 ..c.. srun

user1 32572 ..c.. bash

Alternatively, you can enter the following command (enter the command as root user; if you run the

command as any other user, the command only reports the current user’s references):

# lsof /data

COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME

su 5384 root cwd DIR 83,106 294912 393217 /data/user1

csh 10993 user2 cwd DIR 83,106 4096 52428801 /data/user2/bonnie

ssh 16408 user2 cwd DIR 83,106 4096 52428801 /data/user2/bonnie

csh 22513 user3 cwd DIR 83,106 4096 39682049

/data/user3/bids/noaa/runs/0128

res 31820 user3 cwd DIR 83,106 12288 39649281