dmraid incompatible with multipath-tools?

dmraid incompatible with multipath-tools?

[Phillip Susi]

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A user recently filed this bug report against ubuntu 12.04:

https://bugs.launchpad.net/ubuntu/+source/dmraid/+bug/992975

I believe this is the result of my patch fixing the testing support, and testing being enabled by default.  With testing enabled, it looks like dmraid is finding the physical disks both on the normal scsi devnode, and again on the dm devnode created by multipath-tools.

Why does multipath-tools create a dm mapping for each physical disk by default?  It seems like this is likely to cause other problems as well.  I suppose that configuring dmraid with --disable-testing would resolve this issue ( and it probably should be disabled by default if it doesn't play well with multipath-tools ), but I'd like to understand multipath-tools better first and try to find a better solution.

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