Preparing RHEL LUNs with mount points using DMMP device names for transition using the Inventory Assessment Workbook

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Before transition of a LUN with a mount point using a DMMP device name, you must replace the DMMP device name with its respective file system UUID number. This applies to Red Hat Enterprise Linux (RHEL) 5 and RHEL 6.

This procedure applies to copy-based transitions and copy-free transitions.

Steps
  1. Gather pretransition information from the Inventory Assessment Workbook.

    Specifically, you need the following information:

    • The file system configured on the DMMP device

    • The directory on which the DMMP device is mounted

    • The file system UUID for the DMMP device

Steps
  1. Verify that the mount points for the DMMP device are defined in the `/etc/fstab `file.

  2. Create a backup of the file:

    cp /etc/fstab /etc/fstab_pre_transition

  3. Edit the /etc/fstab file to replace the DMMP device name with its respective file system UUID number.

    In the following example, the DMMP device /dev/mapper/360a9800037534562572b453855496b41 is replaced by UUID a073547e-00b6-4bf9-8e08-5eef08499a9c:

    [root@IBMx3550M3-229-169 ~]# cat /etc/fstab
    /dev/VolGroup00/LogVol00 /  ext3  defaults   1 1
    LABEL=/boot /boot  ext3     defaults         1 2
    tmpfs  /dev/shm    tmpfs    defaults         0 0
    devpts /dev/pts    devpts   gid=5, mode=620  0 0
    sysfs  /sys	       sysfs           defaults  0 0
    proc   /proc       proc           defaults   0 0
    /dev/VolGroup00/LogVol01 swap	swap  defaults 0 0
    /dev/mapper/test_vg-test_lv /mnt/lvm_ext3 ext3 defaults,_netdev 0 0
    UUID=a073547e-00b6-4bf9-8e08-5eef08499a9c /mnt/dmmp_ext3 ext3 defaults,_netdev 0 0

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