[Linux-cluster] Get qdisk to use /dev/mapper/mpathx devices instead of /dev/dm-x

[Carlos Maiolino]

On Wed, May 05, 2010 at 11:03:21AM -0700, Don Hoover wrote:
> I have recently learned that its dangerous to use /dev/dm-x devices for LVM because they do not function correctly with multipath, and that you should always use the /dev/mapper/mpathx devices.  Something about the fact that udev actually destroys and recreates the dm devices when paths change.
> 
> But, qdisk seems to prefer using dm-x devices.  Is there a way to get it to prefer using /dev/mapper/mpathx devices if they are available?
> 
> I know you can spec the device instead of the label, but I would like to avoid that.
> 
> 
> 
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If I understant correctly your question and what you wrote, You are specifing qdisk label in cluster.conf.   this is sufficient, independent of which device it will use to mount qdisk partition during qdiskd startup.



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Best Regards

Carlos Eduardo Maiolino
Software Maintenance Engineer
Red Hat - Global Support Services