HP XC System Software Administration Guide Version 3.1
3. Edit the /etc/systemimager/systemimager.conf file as follows to specify a list of nodes that
will use software RAID:
• Add or change the following entry in this file to specify software RAID-0 for the list of nodes:
SOFTWARE_RAID0_NODES = list of nodes
For example, use SOFTWARE_RAID0 = n[1–5,9] for nodes n1, n2, n3, n4, n5, and n9.
• Add or change the following entry in this file to specify software RAID-1 for the list of nodes:
SOFTWARE_RAID1_NODES = list of nodes
For example, use SOFTWARE_RAID1 = n[1–5,9] for nodes n1, n2, n3, n4, n5, and n9.
4. Ensure that no jobs are currently running on the HP XC system.
5. Run the cluster_config command to update the system configuration database and update the
golden system image:
# /opt/hptc/config/sbin/cluster_config
6. Reimage the nodes. See Chapter 10 (page 129) for specific information.
7. Use the following command on the imaged node to verify the software RAID installation:
# cat /proc/mdstat
The cat /proc/mdstat command is discussed in “Examining a Software RAID Array.”
18.4 Examining a Software RAID Array
You can examine the RAID array with either of two methods.
One method is to use the following command to return data from the system's process information
pseudo–file system:
# cat /proc/mdstat
Another method is to use the mdadm command, which is a utility for creating, managing, and monitoring
devices using the multiple devices driver. The following command line entries are examples of the use of
the mdadm command; the example uses a Serial ATA (SATA) disk.
# mdadm --query /dev/sdb1
/dev/sdb1: device 1 in 2 device active raid1 md1.
Use mdadm --examine for more detail.
# mdadm --detail /dev/md1
/dev/md1:
Version : 00.90.01
Creation Time : date and time
Raid Level : raid1
Array Size : 292608 (285.75 MiB 299.63 MB)
Device Size : 292608 (285.75 MiB 299.63 MB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 1
Persistence : Superblock is persistent
Update Time : date and time
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
212 Managing Software RAID Arrays