Hitachi Dynamic Link Manager Software Users Guide for Linux

Note that, in step 17 in When the MULTIPATH Function Is Not Being Used
for md Devices on page 3-163, [multipath] will be displayed until the
host is restarted. However, there are no operational problems.
Settings for LVM2
This section describes the procedure for setting the following items in an
LVM2 environment:
• When using an HDLM device to create a new logical volume
• When moving a logical volume created on a SCSI device in a single-path
environment, to an HDLM device
When using HDLM in an LVM2 environment, use the HDLM device as an LVM2
physical volume.
Notes on Using LVM2
The following are notes on using LVM2:
• If a logical volume on an HDLM device (LVM2) is used as the boot disk, a
SCSI device cannot be used as an LVM2 physical volume.
• To use a SCSI device and an HDLM device concurrently as LVM2 physical
volumes, edit the /etc/lvm/lvm.conf file so that SCSI devices, which are
managed by HDLM, are not recognized by LVM2.
¢
Red Hat Enterprise Linux6 or Oracle Unbreakable Enterprise Kernel6:
Specify a permanent name, so that the order of the disks that can be
viewed from LVM does not change even if the order of the disks
recognized by the OS changes.
filter = [ "a|sddlm[a-p][a-p].*|","a|
scsi-3600605b005d7a320196f1f53484dfb20|","r|/dev/sd|" ]
Use the udevadm command to check the value to be specified.
# udevadm info -q symlink -n /dev/sda2
block/8:0 disk/by-id/scsi-3600605b005d7a320196f1f53484dfb20
disk/by-path/information-generated-based-on-the-disk-location
disk/by-uuid/information-specific-to-the-disk disk/by-id/wwn-
information-specific-to-the-disk
Output 3600605b005d7a320196f1f53484dfb20 is sda2 and a
supporting by-id name.
¢
OSs other than Red Hat Enterprise Linux6 and Oracle Unbreakable
Enterprise Kernel6:
The following shows an example of settings when the SCSI device
(/dev/sda) and the HDLM device are used together as the physical
volume for LVM2.
filter = [ "a|sddlm[a-p][a-p].*|", "a|/dev/sda[1-9].*|",
"r|/dev/sd|" ]
The following shows an editing example when both a SCSI device (/dev/
sda) and an HDLM device are used as LVM2 physical volumes.
Creating an HDLM Environment
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Hitachi Dynamic Link Manager (for Linux®) User Guide