HP Hitachi Dynamic Link Manager Software - Manual (Page 265)

how to migrate an md device for which the MULTIPATH function is used to an
md device for which the LINEAR function is used.
Note:
Red Hat Enterprise Linux 6 cannot migrate an md device for which the
MULTIPATH function is used to an md device for which the LINEAR function
is used.
In this procedure, the device /dev/md0 on /dev/sdo1 and /dev/sdh1 is
migrated to the device /dev/md0 on /dev/sddlmaa1. Use the following
procedure to configure the environment shown in Figure 3-27 Device
Configuration Where an md Device (An Environment that Uses the md
Device's MULTIPATH Function) on a SCSI Device Is Migrated to an md Device
on an HDLM Device on page 3-193 .
Figure 3-27 Device Configuration Where an md Device (An Environment
that Uses the md Device's MULTIPATH Function) on a SCSI Device Is
Migrated to an md Device on an HDLM Device
To migrate /dev/md0
1
.
Stop all applications that are using the existing md device.
2
.
If necessary, back up the application data residing on the md device.
3
.
If file systems have been mounted on the md device, unmount them.
4
.
Check the status of the md device.
Execute the following command to check the configuration of the md
device:
# cat /proc/mdstat
Personalities : [multipath]
md0 : active multipath sdo1[0] sdh1[1]
5238528 blocks [2/2] [UU]
unused devices:
Make sure that md0 : active and that SCSI devices are displayed.
If md0 : active is not displayed, activate the md device.
Creating an HDLM Environment
3-193
Hitachi Dynamic Link Manager User Guide for Linux ®