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mpath on RHEL

DanGiles

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Can anyone recommend some GOOD documentation (or a tutorial!) on configuring multi-pathing on RHEL? The docs I could find aren't very good at explaining things. For instance, you have a choice for active/active using round-robin or queue depth (to name just a couple), but why one over the other?

Right now I have 22 volumes being presented to the server across 8 paths, so I get 176 sd devices. When you put multi-path on top, one would expect to get 22 dm devices, but there are 44. I need to know what's going on and how to fix it.
 

DanGiles

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I found what I needed in the lvm manual. This along with 'df -h' gives me the filesystem->mpath mapping I'm looking for.

dmsetup info -c -o name,blkdevs_used

No where in anything I read did it imply that you could have multiple dms for the same mpath :(
 

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