Hitachi Dynamic Link Manager Software Users Guide for Linux
UUID=e39a6b15:32e48a5d:ca05f4db:25bc8af9
For details about the contents of the configuration file, see the Linux
documentation or use the man command.
6. Edit the configuration file created in step 5.
Edit the /etc/mdadm.conf file to add auto=yes to the ARRAY line:
DEVICE /dev/sddlmaa1 /dev/sddlmab1
ARRAY /dev/md0 level=raid1 num-devices=2
UUID=e39a6b15:32e48a5d:ca05f4db:25bc8af9 auto=yes
7. Restart the host.
8. Make sure that the md device has been activated.
In the following example, RAID1 (mirroring) is used for the md device:
# cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sddlmaa1[0] sddlmab1[1]
5238528 blocks [2/2] [UU]
unused devices: <none>
Make sure that md0 : active and the HDLM devices are displayed.
Using HDLM in an md Device Environment
This subsection describes how to migrate an environment where the md
devices were constructed by using SCSI devices to an environment where the
md devices were constructed by using HDLM-managed devices.
If the MULTIPATH function is not used for md devices, perform the procedure
described in
When the MULTIPATH Function Is Not Being Used for md Devices
on page 3-163. If the function is used, perform the procedure described in
When the MULTIPATH Function Is Being Used for md Devices on page 3-167.
When the MULTIPATH Function Is Not Being Used for md Devices
The following explains the procedure to use HDLM in an md device
environment where the MULTIPATH function is not being used. The example
below assumes that the RAID functionality is being used for md devices.
In this procedure, the device /dev/md0 on /dev/sdh1 and /dev/sdi1 is
migrated to the device /dev/md0 on /dev/sddlmaa1 and /dev/sddlmab1. Use
the following procedure to configure the environment shown in
Figure 3-12
Device Configuration Where an md Device on a SCSI Device Is Migrated to an
HDLM Device (An Environment that Uses the md Device's RAID Functionality)
on page 3-164.
Creating an HDLM Environment
3-163
Hitachi Dynamic Link Manager (for Linux®) User Guide