Is MDRAID over multipath devices supported in RHEL?

Solution Verified - Updated -

Issue

  • Is MD RAID over multipath device supported?
  • Is it recommended to configure mdadm based on multiapath devices?
  • Is there a usable and supported configuration to install Red Hat Enterprise Linux with software RAID1 on multipathed devices?
  • Can I install my system in a mdadm RAID1 on multipathed devices?

  • /proc/mdstat is showing only one device, not mpath0 and mpath1. Instead it is showing only sda2 and sda3:

        # cat /proc/mdstat
    Personalities : [raid1]
    md0 : active raid1 sda2[0]
          128448 blocks [2/1] [U_]

    md1 : active raid1 sda3[0]
          35214400 blocks [2/1] [U_]

    unused devices: <none>

Environment

  • Red Hat Enterprise Linux (RHEL) products including:

    • Red Hat Enterprise Linux 4 (RHEL4)
    • Red Hat Enterprise Linux 5 (RHEL5)
    • Red Hat Enterprise Linux 6 (RHEL6)

  • device-mapper-multipath manages devices (most likely from a SAN)

  • MDRAID is configured as a layer on top of multipath devices in a similar configuration to:

        /dev/sda1 -|
    /dev/sdc1 -|=> /dev/mapper/mpath0p1 -|
                                         |==> /dev/md0
    /dev/sdb1 -|=> /dev/mapper/mpath1p1 -|
    /dev/sdd1 -|

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