Migrating to EMC powerpath from Linux DM

Hi sanpad,

PowerPath-for-Linux-5.7-and-Minor-Releases-Installation-and-Administration-Guide (attached) describes the process in page 42:

1. Blacklist all devices in /etc/multipath.conf

    a. Save a copy of /etc/multipath.conf as /etc/multipath.conf.bak for backup if it already exists.

    b. Edit /etc/multipath.conf so that it contains only the following lines:

          blacklist {

              devnode "*"

          }

2. Ensure dm-multipath does not start automatically at boot.

    # chkconfig multipathd off

    # chkconfig --list multipathd -- - -Service should be off on all run levels

3. Recreate initramfs so that dm-multipath is excluded from initramfs.

    # dracut /boot/initramfs-wo-DM-$(uname -r).img $(uname -r)

4. Add a new boot entry with the initramfs file created in previous step in the /boot/grub/menu.lst file.

5. Reboot the host with the new initramfs image and ensure dm-multipath does not have any devices configured.

    # multipath -ll --- should not return any dm devices

As you can see, removing dm-mpio requires rebooting the host. PowerPath installation doesn't require any reboot.

Regards

Javier Soriano

PowerPath Corporate Systems Engineer