eDirectory 88 SP3 shipped with a 64-bit version of eDirectory on Linux. eDirectory 884 was also available as 64-bit on the 64-bit OES Linux. 64-bit eDirectory was a cross platform release of 88 SP5.
There were lot of questions for us to explain the benefits of 64-bit eDirectory. We have tried to evaluate the 32-bit & 64-bit eDir in various scenarios. The document at http://www.novell.com/docrep/2009/10/64bit-edirect...
should help in this regards.
Disclaimer: As with everything else at Cool Solutions, this content is definitely not supported by Novell (so don't even think of calling Support if you try something and it blows up).
It was contributed by a community member and is published "as is." It seems to have worked for at least one person, and might work for you. But please be sure to test, test, test before you do anything drastic with it.