Configuring multipathing

Deploying an HCP VM System on KVM
Version
9.6.x
Audience
anonymous
Part Number
MK-94HCP009-07

Before setting up DM-Multipath on your system, make sure your system includes the device-mapper-multipath package.

To configure multipathing:

  1. Enter the following command to list all block devices visible to the operating system:
    lsblk
    Here is a sample output:
    NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sdf 8:80 0 1T 0 disk
sdd 8:48 0 1T 0 disk
sdb 8:16 0 7.3T 0 disk
sdk 8:160 0 1T 0 disk
sdi 8:128 0 1T 0 disk
sdg 8:96 0 1T 0 disk
sde 8:64 0 1T 0 disk
sdc 8:32 0 7.2T 0 disk
sda 8:0 0 64G 0 disk
??sda2 8:2 0 63G 0 part
? ??fedora00-swap 253:1 0 6.4G 0 lvm [SWAP]
? ??fedora00-root 253:0 0 15G 0 lvm /
??sda1 8:1 0 1G 0 part /boot
sdj 8:144 0 1T 0 disk
sdh 8:112 0 1T 0 disk
  2. Enter the following command to set up DM-Multipath for basic failover:
    mpathconf --enable --with_multipathd y
  3. Enter the following command to start the multipath service:
    multipathd
  4. Enter the following command to verify that SAN LUN devices are listed:
    lsblk
    Here is a sample output:
    NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sdf 8:80 0 1T 0 disk
??mpathb 253:3 0 1T 0 mpath
sdd 8:48 0 1T 0 disk
??mpatha 253:2 0 1T 0 mpath
sdb 8:16 0 7.3T 0 disk
sdk 8:160 0 1T 0 disk
??mpathc 253:4 0 1T 0 mpath
sdi 8:128 0 1T 0 disk
??mpathd 253:5 0 1T 0 mpath
sdg 8:96 0 1T 0 disk
??mpathc 253:4 0 1T 0 mpath
sde 8:64 0 1T 0 disk
??mpathd 253:5 0 1T 0 mpath
sdc 8:32 0 7.2T 0 disk
sda 8:0 0 64G 0 disk
??sda2 8:2 0 63G 0 part
? ??fedora-swap 253:1 0 6.4G 0 lvm [SWAP]
? ??fedora-root 253:0 0 15G 0 lvm /
??sda1 8:1 0 1G 0 part /boot
sdj 8:144 0 1T 0 disk
??mpathb 253:3 0 1T 0 mpath
sdh 8:112 0 1T 0 disk
??mpatha 253:2 0 1T 0 mpath
    The devices should now have a multipath.
  5. Enter the following command to list all multipath devices attached to the system:
    multipath -l