Hitachi Dynamic Link Manager, User Manual, Page: 256 / 746

3. Creating an HDLM Environment
232
3.9 Settings for md Devices
This section explains the procedures that the user must perform when using md
devices.
3.9.1 Notes on Setting Up md Devices
The following are notes on using md devices:
• Because HDLM is multi-path software, it cannot be used with the
MULTIPATH
function for md devices.
•
If you are using the
MULTIPATH
function for md devices before you install
HDLM, change it to the
LINEAR
function after installing HDLM.
• An md device created in HDLM cannot be used in a boot disk environment.
• If an md device has been applied to a directory that cannot be unmounted while
the system is operating (such as
/opt
,
/tmp
, or
/var
), HDLM cannot be applied
to that md device.
•
You cannot use the disk partition type
RAID
(
fd
).
• In mdadm package versions 1.6.0-2 or earlier, you cannot manage devices whose
major or minor number is 256 or greater. Use mdadm package versions 1.6.0-3 or
later.
• You cannot simultaneously specify SCSI devices and HDLM devices to configure
an md device. Figure 3-23: Example of Incorrectly Configured md Devices
shows an example when SCSI devices and HDLM devices are simultaneously
specified by mistake.