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тАО10-26-2010 06:48 AM
тАО10-26-2010 06:48 AM
I am looking to remove EMC PowerPaath and install the device-maper-multipaath (rhel 5). Could someone let me know what steps/conf files things to look into to acheive this?
Thanks
M Swift
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тАО10-26-2010 05:04 PM
тАО10-26-2010 05:04 PM
Re: Removing PP and install Devic maper multipatth
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тАО10-26-2010 05:30 PM
тАО10-26-2010 05:30 PM
Re: Removing PP and install Devic maper multipatth
Thanks
MSwift.
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тАО10-26-2010 05:33 PM
тАО10-26-2010 05:33 PM
Re: Removing PP and install Devic maper multipatth
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тАО10-26-2010 09:16 PM
тАО10-26-2010 09:16 PM
Re: Removing PP and install Devic maper multipatth
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тАО10-26-2010 10:58 PM
тАО10-26-2010 10:58 PM
Re: Removing PP and install Devic maper multipatth
The documentation for EMC products is available at the EMC Powerlink website:
http://powerlink.emc.com
(registration required, works best using IE browser)
While you're using PowerPath, your LVM configuration should include a filter expression that makes LVM search for PVs on PowerPath devices (/dev/emcpower*) and local disks only. When you remove PowerPath, you should change that filter to prefer device-mapper multipath devices instead (/dev/mapper/mpath* if you use RHEL default names). Check the keywords "filter" and "preferred_names" in /etc/lvm/lvm.conf.
If you're using Oracle ASM for managing raw database disks, then a similar change must be made to ASM's ASM_DISKSTRING parameter.
While you already have dm-multipath installed, it's probably been disabled by a "blacklist everything" configuration setting in /etc/multipath.conf. Once you have removed PowerPath, your first task is to disable that blacklisting to enable dm-multipath. But that's documented in Chapter 3.1 ("Setting up dm-multipath") of this RedHat document:
http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/DM_Multipath/index.html
MK
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тАО10-27-2010 06:30 AM
тАО10-27-2010 06:30 AM
Re: Removing PP and install Devic maper multipatth
When we have removed PP and installed DMM should a vgscan discover the vgs? since i assume now that /etc/lvm/lvm.conf would be the metadata file, if we take the PP filter out of the metadata file, we should be able to see all the PVs, which means the VGs will be there with no vgscan needed?? or would it require a reboot which would discover the devices and would also do a vgscan? Please advise...
Best Regards
MSwift.
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тАО10-27-2010 07:18 AM
тАО10-27-2010 07:18 AM
Re: Removing PP and install Devic maper multipatth
Once your configuration is complete, I would recommend that you reboot to verify that the system definitely boots correctly in the new configuration.
If your /var is a separate filesystem (= not part of the root filesystem), you should be aware of this:
https://access.redhat.com/kb/docs/DOC-5544
(RHN account required)
MK
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тАО10-27-2010 07:44 AM
тАО10-27-2010 07:44 AM
Re: Removing PP and install Devic maper multipatth
I will try it. One more question. Is it a must to have Multipathd running to make the Device-mapper to work?
Best Regards
MSwift.
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тАО10-27-2010 11:57 PM
тАО10-27-2010 11:57 PM
SolutionHowever, there is no problem in restarting multipathd while multipathed disks are in use.
(The dm-multipath module can use existing paths just fine without the help of multipathd, and it can even drop out paths that seem to have failed. But it won't automatically add new paths to existing multipath devices, or resume using failed paths once they've been repaired: that's what multipathd does.)
MK