I installed evms on a clean install. I made some evms volumes. They didn't show up in /dev/evms, even after a reboot. After debugging for a while I think the problem is that I didn't have mdadm installed. After installing and rebooting my partitions showed up in /dev/evms. Perhaps I'm just confused at some higher level, but my conclusion from this is the evms ebuild should depend on evms, so /lib/rcscripts/addons/raid-start.sh is called at boot.
You are really confused; evms installs its own addon script for udev. You most likely have RC_VOLUME_ORDER in /etc/conf.d/rc set improperly. Put evms as the first value there and it should work.
I freely admin that for "bugs" of this class "user confusion" is the most likely culprit. However: things really did start working only after I installed mdadm, both for finding devices after boot, and for devices appearing in /dev/evms after saving in evmsn. My RC_VOLUME_ORDER is completely stock from /etc/conf.d/rc: RC_VOLUME_ORDER="raid evms lvm dm" I think this means evms was first when mdadm wasn't installed, and 2nd afterwards. I appreciate the fast comment, but I don't think that's the problem. Neil