Beware of the semaphores!

I just run into a weird problem today when I was in the process of migrating a bunch of servers from an old HP SAN to a shiny new EMC VMAX.

The client have chosen to use Powerpath for the multipathing software on RHEL 5. The servers in question run multiple Oracle databases into a grid configuration. We had no problem with the old SAN and we had no problem with the new EMC VMAX using dm-multipath.

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