Replace linux native multipath with PP

Question

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

HurseB · Accepted Answer

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.

https://support.emc.com/docu56668_PowerPath-for-Linux-6.0-Installation-and-Administration-Guide.pdf

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..

PowerPath

Replace linux native multipath with PP

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