You need to disable native multipathing and boot into the WO ram disk first before the PowerPath install. . Note it is in the boot from san section but still applies. See page 38 of the linked guide.  [URL]  From the guide..  Disabling dm-multipath on a RHEL 6.x or OL 6.x host  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-mul tipath is excluded from initramfs. # dracut /boot/initramfs-wo-DM-$(uname -r).img $(uname -r) 4. Add a new boot entry with the initramfs file created in previous step in the /boot/grub/menu.lst file. 5. Reboot the host with the new initramfs im age and ensure dm-multipath does not have any devices configured. # multipath -ll   --- should not return any dm devices  After you boot into the new ram disk you will then do the PowerPath install and lvm configuration per the guide..
Hi all  I've to replace native multipath on a Oracle linux with oracle RAC and ASM with Powerpath 6. I can't find a document that explain steps to do this. I'm planning these steps. 1.  Mask emcpower device in lvm.conf      vi /etc/lvm/lvm.conf           filter = [ "a/emcpower.*/", "r/sd.*/", "r/disk.*/" ] 2. Install powerpath      rpm -ivh EMCpower.LINUX-*.rpm 3. Configurare PP license      emcpreg -install 4. Disable native multipath Edit /etc/multipath.conf so that it contains only the following lines:           blacklist {                 devnode "*"           }      chkconfig multipathd off      dracut /boot/initramfs-wo-DM-$(uname -r).img $(uname -r) Add a new boot entry with the initramfs file created in previous step in the /boot/grub/menu.lst  5. start PP /etc/init.d/PowerPath start 6. check all device  Are these steps correct?  thanks  MAtteo
Replace linux native multipath with PP