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Replace linux native multipath with PP
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 $(uname -r)
Add a new boot entry with the initramfs file created in previous step in the
/boot/grub/menu.lst
5. start PP
/etc/init.d/PowerPath start
6. check all device
Are these steps correct?
thanks
MAtteo
HurseB
11 Posts
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February 25th, 2015 07:00
You need to disable native multipathing and boot into the WO ram disk first before the PowerPath install. . Note it is in the boot from san section but still applies. See page 38 of the linked guide.
https://support.emc.com/docu56668_PowerPath-for-Linux-6.0-Installation-and-Administration-Guide.pdf
From the guide..
Disabling dm-multipath on
a RHEL 6.x or OL 6.x host
1. Blacklist all devices in /etc/multipath.conf
a. Save a copy of /etc/multipath.conf as
/etc/multipath.conf.bak for backup if it
already exists.
b. Edit /etc/multipath.conf so that it contains only the following lines:
blacklist {
devnode "*"
}
2. Ensure dm-multipath does not start automatically at boot.
# chkconfig multipathd off
# chkconfig --list multipathd
-- - -Service should be off on
all run levels
3. Recreate initramfs so that dm-mul
tipath is excluded from initramfs.
# dracut /boot/initramfs-wo-DM-$(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..